Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

DOI： 10.2525/ecb.58.65

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

We investigated the autofluorescence of tomato surface tissues during overripening at 25 degrees C for 13 days. Microscopic images and fluorescence spectra of tissues, including the epidermis and cuticle, were examined (excitation at 360 nm), revealing that the autofluorescence changes were related to the epidermis, particularly the fluorophores in the cuticle.

DOI： 10.1039/d0pp00125b

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

The potential of UV-induced fluorescence imaging was investigated as a non-destructive tool to monitor postharvest quality degradation of tomatoes harvested at the red stage and stored at 25 degrees C. The fluorescence images (excitation at 365 nm) were found to be a better indicator of tomato quality degradation than color images after color saturation. Tomatoes were stored at 25 degrees C for 9 d. The changes in color and fluorescence of tomato were evaluated by two types of images: Color and fluorescence images. A conventional colorimeter was also used for as a reference. Changes in the RGB ratio for these two types of images were opposite. In the color images, the G ratio decreased rapidly for the initial 3 or 5 d and then stabilized afterwards. On the other hand, in the fluorescence images, the G ratio increased continuously up to 9 d. Given that temperature conditions during transportation and storage of tomatoes is not always ideal, the results from this research provide the foundation for developing a postharvest monitoring system of mature tomato quality degradation.

DOI： 10.1016/j.postharvbio.2019.111031

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：SOC ECO-ENGINEERING, ENV SCI & TECH, GRAD SCH LIFE & ENV SCI  

The Speaking Plant Approach (SPA) is regarded as a desirable concept which defines that the environmental factors should be adjusted to the crop's physiological status. The first and most important step in the SPA concept is to obtain physiological information from a living plant. Especially for environmental control in highly sophisticated greenhouse, daily measurement of plant growth must be indispensable in SPA concept. In our previous study, a robotized chlorophyll fluorescence (CF) imaging system that evaluates daily changes in photosynthetic function of tomato canopy has been developed and came onto the market in 2015. In this study, we applied the robotized CF imaging system to measure the daily stem elongation of tomato plants grown in greenhouse. CF images of shoot apex of tomato plants were taken by using the robotized CF imaging system and detected the shoot apex manually by using commercially available image analysis software to obtain the average plant height. Then, the daily stem elongation was calculated by subtracting the average plant height of one day before from that of the day. The performance verification test proved that the spatial resolution of CF image was 1.6 mm pixel(-1) and the reproducibility of average height measurement was within 0.01 %. And, a long-term stem elongation monitoring for consecutive 70 days, which was done with the conventional weekly stem elongation monitoring by using a measuring tape, suggested that daily stem elongation is able to be monitored with the robotized CF imaging system.

DOI： 10.11450/seitaikogaku.32.15

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Insight Society  

High-quality fruits can be produced by controlling the environmental factors, i.e. temperature, relative humidity, carbon dioxide, and light intensity. The tomato (Solanum lycopersicum) variety ‘Rinka 409', was grown hydroponically with a high-wire system in high technology greenhouse, Ehime University, Japan. The water stress treatment using visual monitoring system was used to produce the high soluble solids tomato fruits. Moreover, a high lycopene content of tomato can be produced by controlling the storage condition. Non-destructive measurement has been known to provide a fast and accurate quality measurement of fruits and vegetables. The objectives of this study were to develop a precise position for the non-destructive measurement of the lycopene content in high soluble solids stored tomato using Vis/NIR spectroscopy and evaluate its performance. In this study, the high soluble solids of tomato fruits were grown under water stress treatment and stored after harvesting at 25°C in a cool incubator for 7 days. The tomato spectra were measured using Vis/NIR spectroscopy with the wavelength 500-1010 nm. The estimation of the lycopene content was based on the statistical model using multivariate analysis. From this study, it is concluded that the measurement of lycopene content in high soluble solids of tomato fruits after storage by using the top part of the tomato, was better than if it is compared to the side part. It was best determined using PLS analysis with Visible/Near-infrared Spectroscopy non-destructively, with the R 0.98 and RMSE 0.80.

DOI： 10.18517/ijaseit.10.6.9478

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：SOC ECO-ENGINEERING, ENV SCI & TECH, GRAD SCH LIFE & ENV SCI  

As a highly sophisticated strategy for environmental control in greenhouses, the concept of speaking plant approach (SPA) has attracted a great deal of attention. Sensor-based plant diagnosis techniques to monitor plant physiological status are the first and most important step in SPA. Currently, imaging systems for plant growth monitoring are especially required in wide range of agricultural production not only in advanced greenhouses but also in traditional vinyl houses. In this study, we developed a compact- and lightweight-multiple imaging system that is consist of an infrared camera filtered with a long-pass filter (lambda > 620 nm), a color camera, and blue/red/infrared/white LEDs. The developed imaging system enable us to conduct chlorophyll fluorescence imaging, NDVI imaging, and color imaging at the same time. We applied the system for imaging of tomato plant grown under greenhouse condition and successfully obtained an obvious chlorophyll fluorescence induction curve derived from a series of chlorophyll fluorescence images and NDVI and color images that are useful to identify the matured tomato fruits.

DOI： 10.11450/seitaikogaku.32.33

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

DOI： 10.2525/ecb.56.127

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Society of Eco-Engineering  

 To increase the annual yield of greenhouses, CO₂enrichment has been increasing in popularity in Japan. For appropriate use of the instrumentation, scientific knowledge of the environmental response of canopy photosynthesis is required. However, a lack of such knowledge by growers and instructors, e.g. agricultural extension workers and farming instructors, has resulted in scientifically inappropriate usage of such instrumentation in commercial greenhouses. To solve this problem, an adequate learning tool for growers and instructors to obtain enough knowledge of the environmental response of canopy photosynthesis is required. In this study, we developed an MS Excel based annual yield estimation tool for greenhouse tomato production. This tool is composed of 10 spreadsheets. Each spreadsheet has a particular function; an equation for leaf area estimation (Sheet 1), a model for vertical leaf area distribution (Sheet 2), a model for vertical light distribution (Sheet 3), a model for photosynthetic light (and CO₂) response of leaves (Sheet 4), a model for dry matter distribution within a plant body (Sheet 5), specifics of greenhouse structure and parameter settings for greenhouse environmental control (Sheet 6), data on solar radiation and air temperature at intervals of 1 hour (Sheet 7), estimation of total photosynthesis of tomato canopy without CO₂ enrichment (Sheet 8), estimation of total photosynthesis of tomato canopy with CO₂ enrichment (Sheet 9), and estimation of expected annual tomato yield (Sheet 10). By using the developed tool, we investigated the effect of CO₂ enrichment in a greenhouse located in Matsuyama City (Ehime Prefecture, Japan) and demonstrated that CO₂ enrichment at 8.0 kg 10 a ^-1h^-1 increased the annual tomato yield at 38.9% but further CO₂ enrichment above 10 kg 10 a ^-1h^-1 was not effective to improve annual tomato yield.

DOI： 10.11450/seitaikogaku.30.47

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Society of Eco-Engineering  

<p>&ensp;&ensp;To achieve higher production in greenhouses, maximization of crop net photosynthesis is required; hence, CO₂ enrichment and supplemental lighting equipment has been installed in many commercial greenhouses. In practice, appropriate profitability analysis should be performed before such installations. Crop growth and yield simulation models based on the environmental response of leaf photosynthesis are useful to evaluate the increase in profitability derived from the new equipment. Therefore, accurate and compatible data on the environmental response of leaf photosynthesis are necessary. In this study, we proposed a general protocol for the measurement of leaf photosynthesis environmental response, i.e., light response curve and CO₂ response curve, that can be widely applied to the crops grown in greenhouses. Furthermore, the effects of stomatal opening/closure and phosphate limitation on the photosynthesis of tomato leaves through the proposed measurement protocol were investigated. The results demonstrated that the effects of stomatal opening/closure on the photosynthetic rate during light response curve measurement are small, particularly under high CO₂ concentrations; however, the stomata tended to be closed when the measurement was performed on a cloudy day. Moreover, in the measurement of CO₂ response curve, the stomatal response to CO₂ concentration differs depending on PPFDs, i.e., stomata tended to close under high CO₂ concentrations (> 400 μmol mol^-1) at a PPFD of 500 μmol m^-2s^-1, but not at PPFDs of 1000 and 1500 μmol m^-2s^-1. Furthermore, a slight but significant decrease in photosynthetic rate, which might be caused by phosphate limitation, was observed at high PPFD and high CO₂ concentration.</p>

DOI： 10.11450/seitaikogaku.29.73

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Language：Japanese   Publisher：The Society of Eco-Engineering  

Effects of low nighttime air temperature (LNT) and high electrical conductivity (HEC) of a nutrient solution on the growth and yield of sweet pepper (Capsicum annuum L.) were investigated during winter (Oct 25, 2014 to Feb 28, 2015) in an experimental Venlo-type greenhouse in Kochi Prefecture. A "pre-night temperature drop," which is a quick drop in the air temperature early in the nighttime, is often used in large-scale greenhouses. In this study, the length of the pre-night temperature drop was extended from 3 h (control) to 9 h (LNT), and the electrical conductivity of the nutrient solution supplied to the plants was increased from 2–3 dS m-1 (control) to 3–4 dS m-1 (HEC). The effects of LNT and HEC on the growth of sweet pepper differed between the periods before and after the winter solstice. Before the winter solstice, LNT significantly reduced the rates of stem elongation and node formation by 34% and 32%, respectively, whereas after the winter solstice, HEC became the key factor influencing the reduction in the rate of stem elongation, but neither LNT nor HEC affected the rate of node formation. Neither LNT nor HEC affected the leaf photosynthetic ability, or the number or dry weight of fruits, but HEC did reduce the total yield by inhibiting leaf expansion and fruit enlargement.

DOI： 10.11450/seitaikogaku.28.29

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Other Link： https://jlc.jst.go.jp/DN/JLC/20022476843?from=CiNii

Language：Japanese   Publisher：The Society of Eco-Engineering  

The effects of low long-term vapor pressure deficit (VPD) conditions on leaf morphology, photosynthetic functions, and yield of sweet pepper (<i>Capsicum annuum</i> L.) grown in a Venlo-type greenhouse were investigated. The relative humidity in a greenhouse with a fogging system (Fog) was maintained at >70%, which was approximately 10% higher than that in a greenhouse without a fogging system (Control). In Fog, VPD was approximately 0.7 kPa during daytime throughout the experimental period (September 20, 2013 to January 31, 2014). In the low VPD condition, the water uptake decreased by 18% and the leaf area increased by 6% (upper leaf) to 20% (lower leaf). The maximum photosynthetic rate, total chlorophyll (Chl) content, and Chl <i>a</i>/<i>b</i> ratio of the lower leaves in Fog decreased compared with those in Control. These results suggested that the low water uptake in Fog because of the lower VPD probably decreased the nutrient uptake and resulted in the low total Chl content of the leaves. In addition, the lower VPD in Fog may have allowed leaf expansion and resulted in a higher leaf area index and acclimation of the lower leaves to the low light condition. However, there was no obvious difference in the yields between Fog and Control.

DOI： 10.11450/seitaikogaku.27.91

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Publishing type：Research paper (scientific journal)   Publisher：International Society for Horticultural Science (ISHS)  

DOI： 10.17660/actahortic.2014.1037.86

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Publishing type：Research paper (scientific journal)   Publisher：International Society for Horticultural Science (ISHS)  

DOI： 10.17660/actahortic.2014.1037.47

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INT SOC HORTICULTURAL SCIENCE  

The Speaking Plant Approach (SPA) is regarded as a desirable and indispensable concept for environmental control in highly sophisticated greenhouses. The SPA is based on the paradigm that the optimization of crop cultivation conditions should be based on measurements of the plant physiological status. The weekly monitoring of stem diameter and stem elongation rate is the most traditional and fundamental SPA in year-round tomato production. In general, the stem diameter and stem elongation rate of the specified 6-10 plants selected from 25,000-75,000 plants grown in 1-2 ha cultivation area are measured. Based on these values, growers judge whether or not the plant's growth is balanced. However, the distributions of stem diameter and stem elongation rate in a commercial large-scale greenhouse have never discussed. In this study, the stem diameter and stem elongation rate of more than 1,000 tomato plants selected from 30,000 plants in a 1.3 ha cultivation area were measured and the distribution of these parameters across the cultivation area was investigated. The maps of stem diameter and stem elongation rate revealed that the plant with a thick stem showed a shorter stem elongation. Furthermore, an additional investigation of night air temperature distribution demonstrated that the plants with thicker and shorter stems were located in the lower air temperature areas.

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Language：English   Publishing type：Research paper (scientific journal)  

Roof greening in warehouse is expected not only to improve the environment but also to reduce the heat island effects by evapotranspiration from the soil and plants. Effects of roof greening on room air temperature in warehouse and cooling load in summer were investigated using simulation model. In this study, two types of roof greening were assumed, roof greening with soil (greening type 1) and without soil (greening type 2). Our results showed that room air temperature in warehouse was decreased by 18.1°C for greening type 1 and 9.5°C for greening type 2 compared with no roof greening. In greening type 1, the room air temperature was decreased with increasing the coefficient of transpiration from the plants. The maximum room air temperature was decreased with increasing the light interception ratio and decrease in room air temperature with increasing light interception ratio in greening type 2 was larger than that in greening type 1. Daily cooling load with greening type 1 was lower than that with greening type 2. Electricity cost for air-conditioning in summer was reduced by 135 yen for greening type 1 and 63 yen for greening type 2 compared with that for no greening when set temperature for cooling was 26°C. These results suggested that roof greening with soil can maintain lower air temperature in warehouse and save more cooling load than that without soil due to the latent heat with evaporative cooling from the soil.

DOI： 10.2525/ecb.51.99

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Language：English   Publishing type：Research paper (scientific journal)  

The transgenic lettuce expressing double repeated Stx2eB (2 × Stx2eB) is considered to be an edible vaccine candidate against swine edema disease. For the efficient vaccine protein production in transgenic lettuce grown in a plant factory, the effects of air flow on vaccine protein production in transgenic lettuce were investigated. Plants were grown hydroponically in a closed-type plant factory for 21 days with four airflow patterns: 1) air flow from the side to leaves at 2.0 m s -1
2) air flow from the top to the inner developing leaves with flexible transparent tubing at 1.0 m s -1
3) air flow from the bottom to leaves with transparent tubing at 1.0 m s -1
and 4) no air flow. Our results showed that the total leaf number in air flow from the top and the bottom to leaves was significantly increased compared with that in no air flow. While lettuce growth with inner air flow and bottom air flow was enhanced, tipburn at the developing leaves were eliminated by air flow. 2 × Stx2eB per plant in bottom air flow to leaves was the highest of the four air flow patterns. These results suggest that bottom air flow to the leaves can enhance vaccine protein productivity in transgenic lettuce.

DOI： 10.2525/ecb.50.135

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Language：English   Publishing type：Research paper (scientific journal)  

Measurement of the slow phase (the P-S-M-T phase) of the chlorophyll fluorescence induction (CFI) phenomenon is a prospective candidate for plant diagnosis in greenhouses. We applied a methodology, the consecutive measurements of photochemical efficiency of photosystem (PS) II (0pSii) and non-photochemical quenching (NPQ) during a CFI phenomenon, to clarify the contributions of photochemical and non-photochemical quenching to the slow phase of CFI curves in mature tomato leaves grown in a semi-commercial greenhouse. The tfVsn increased significantly between the inflection points of P and S and decreased between the inflection points of S and M. On the other hand, the NPQ remained at low values during the inflections of P, S and M, but then increased exponentially. These results prove that the shape of the CFI curve during the inflections of P, S and M is predominantly determined by the changes in the status of the pho-tosynthetic electron transport chain, and the shape of the CFI curve after the inflection of M is strongly regulated by non-photochemical quenching, especially of the xanthophyll cycle. Furthermore, the two CFI measurements conducted at an interval of nine days proved that the slight changes in the photosynthetic functions, i.e. decreases in the capacities of the photosyn-thetic electron transport and the xanthophyll cycle, are detectable by measuring the slow phase of the CFI phenomenon.

DOI： 10.2525/ecb.50.181

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier B.V.  

The relationship between serum vitamin A level and tapetum reflection was investigated using ultraviolet imaging. The tapetum was obtained from eyes of slaughtered cattle in which the serum vitamin A level was below 50 IU/dl. The tapetum reflection was examined in the tapetum lucidum, tapetum nigrum, and optic disc. For each part, the tapetum reflection decreased with increasing serum vitamin A level. A high tapetum reflection value might represent the bleached tapetum symptom that occurs because of the low serum vitamin A level.

DOI： 10.1016/S1881-8366(11)80012-1

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Language：English   Publisher：Asian Agricultural and Biological Engineering Association  

The optimum wavelength for measuring pupil reflection in order to estimate serum vitamin A level in slaughtered and live cattle was investigated. A multispectrum camera was used to obtain the eye images. The highest coefficient of determination 0.76 between pupil reflection and serum vitamin A level was obtained at 500 nm. Since the photosensitive pigment rhodopsin has a maximum absorption of about 500 nm, the results suggest that 500 nm could be the optimum wavelength for measuring pupil reflection.

DOI： 10.11165/eaef.3.42

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Language：English   Publisher：Asian Agricultural and Biological Engineering Association  

The optimum wavelength for measuring pupil reflection in order to estimate serum vitamin A level in slaughtered and live cattle was investigated. A multispectrum camera was used to obtain the eye images. The highest coefficient of determination 0.76 between pupil reflection and serum vitamin A level was obtained at 500 nm. Since the photosensitive pigment rhodopsin has a maximum absorption of about 500 nm, the results suggest that 500 nm could be the optimum wavelength for measuring pupil reflection.

DOI： 10.11165/eaef.3.42

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CROP SCIENCE SOC JAPAN  

The effects of elevated carbon dioxide concentration ([CO2]) on silica deposition on husk epidermis of rice (Oryza saliva L. cv Akitakomachi) during the flowering stage were investigated in this study. The study was motivated by the concept that the rice yield maybe affected by global warming as a result of elevated [CO2] environment since sterility of rice is related to the panicle silica content that influences transpiration, and elevated [CO2] could affect plant transpiration. Silica deposition analysis was focused on the flowering stage of the rice crop grown hydroponically under two [CO2] conditions: 350 mu mol mol(-1) (ambient) and 700 mu mol mol(-1) (elevated). Silica deposition on the husk epidermis from three parts of the particle at four flowering stages were examined using a: scanning electron microscope (SEM) combined with an energy dispersive X-ray microanalyzer (EDX). The results demonstrated that elevated [CO2] significantly suppressed silica deposition on the husk epidermis at the lower part of the panicle, and at the early flowering stage when 1/3 of the panicle emerged from the leaf sheath. In the transverse section analysis of the husk, silica deposition on the husk epidermis tinder elevated [CO2] was less than that under ambient [CO2] at the late flowering stage. The less silica deposition observed on the husks at the late flowering stage under elevated [CO2] might be related to the suppressed transpiration from the panicle by elevated [CO2] found in a previous study.

DOI： 10.1626/pps.11.307

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Language：English   Publisher：Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

Whole plant carbon exchange rate (CER) measurements provide an integral assessment of how an entire plant responds to biotic and abiotic factors. CER determination is based on measurements of CO<SUB>2</SUB> uptake and release that can be determined using various types of systems including Closed, Semi-closed, and Open systems. This review focused on important design and operational considerations of Open CER measurement systems. Primary mechanical and biological factors that may influence measurement accuracy including chamber leakage, CO<SUB>2</SUB> differential between air inlet and outlet of a chamber, chamber air humidity, canopy air speed, acidity of growth media, and irrigation water to name a few. Proper design and operation of a whole canopy photosynthesis system are necessary to assure accuracy of the CER measurements that may be used to assess both short-term responses and long-term yield of a plant as a result of given stimuli.

DOI： 10.2525/ecb.46.91

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Other Link： https://jlc.jst.go.jp/DN/JALC/00327512842?from=CiNii

Language：English   Publishing type：Research paper (scientific journal)  

Silica is distributed in rice plant by the transpiration stream. However, it is unknown the effects of atmospheric carbon dioxide concentration ([CO2]) on silica deposition in the rice plants. In the present study, we investigated the effects of elevated [CO2] on silica contents of the rice plant and focused on the relationships between transpiration rate and silica content of the panicle and leaves under elevated [CO2] at the flowering stage. The rice seedlings were grown hydroponically in two chambers until the flowering stage. The [CO2] in the chambers was maintained at 350µmol mol-1(ambient [CO2]) or 700 µmol mol-1(elevated [CO2]). Silica contents of the panicle and the flag leaf under elevated [CO2] significantly decreased compared with those under ambient [CO2] when silica was applied to the culture solution. The transpiration rate of the panicle decreased with increasing panicle silica content under ambient [CO2]. No correlations between transpiration rate and silica content of the panicles and leaves were observed under elevated [CO2]. © 2007, The Society of Agricultural Meteorology of Japan. All rights reserved.

DOI： 10.2480/agrmet.63.89

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CROP SCIENCE SOC JAPAN  

DOI： 10.1626/pps.9.168

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Language：English  

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Language：English  

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Language：Japanese   Publisher：The Japanese Society of Agricultural Machinery and Food Engineers  

DOI： 10.11357/jsam1937.64.Supplement_433

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Language：English   Publisher：JAPANESE SOCIETY OF AGRICULTURAL, BIOLOGICAL AND ENVIRONMENTAL ENGINEERS AND SCIENTISTS  

Precision agriculture is now practiced in plant factories. In the case of precision agriculture in Japan, the Microprecision Agriculture program is defined as an ultimate optimized plant production system utilized in order for plant factories to have environmental safeguards that are compatible with yield. Microprecision techniques to manage temperatures or other parameters in the plant factory can provide objectively controlled environments for specific purposes. In fact, in a plant factory, some environmental non-uniformity always exists within the interior. Most of the environmental factors in a fully controlled plant factory are observable and controllable. The conventional strategy for the environmental control of the interior of plant factories has been to make atmospheric factors, such as temperature and humidity, as uniform as possible throughout the interior space. This paper discusses an experiment to control local temperatures, as an example of how microprecision technology can be implemented in plant factories. The results of the experiment using a neural network model show that it is possible to control the temperature distributions by manipulating the wind directions and the temperatures of the airflow. This technique can also be implemented in people's living and working environments.

DOI： 10.2525/jshita.14.131

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Other Link： https://jlc.jst.go.jp/DN/JALC/00159638765?from=CiNii

Language：English   Publishing type：Research paper, summary (international conference)  

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Language：English   Publishing type：Research paper, summary (international conference)  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

To resolve the problem of declination of Japanese agriculture, plant factories with automation, quality control, robotization and speaking plant approach are necessary. The multi operation system described in this paper has running unit with automatic position sensing. Growth environment measurement unit has transpiration, photosynthesis, distance and temperature sensors to obtain plant growth information. The pest control unit uses the antiseptic effect of ozone water. The harvesting unit is used for cucumbers that grow fast; recognition of cucumbers ready to be harvested is achieved through distance information gathered by an attached distance sensors. The development of multi-operation robot is continued by developing controlling program that can change the operating pattern by sharing the contents by each controlling and operating unit.

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Language：English   Publishing type：Research paper, summary (international conference)  

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Language：English   Publishing type：Research paper, summary (international conference)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

Precision agriculture is now practiced in plant factories. Microprecision techniques to manage temperature or other parameters in the plant factory can provide objectively controlled environments for specific purposes. This paper discusses an experiment to control local temperatures, as an example of how microprecision technology can be implemented in plant factories. This technique,can also be implemented in people's living and working environments. Copyright (C) 2001 IFAC.

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Language：English   Publishing type：Research paper, summary (international conference)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

As precision agriculture in Japan, Microprecision Agriculture program is defined as an ultimate optimized plant production system practiced for plant factories to be compatible environmental safeguards with yield. In fact at the plant factory, some environmental non-uniformity within the interior always exists. However the environmental non-uniformity is still left uncontrolled. In this paper, local temperature controls as a microprecision technology for plant factory will be discussed. Copyright (C) 2001 IFAC.

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