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Non-invasive water status detection in grapevine(Vitis vinifera L.)by thermography

International Journal of Agricultural and Biological Engineering 2009年第4期2卷 46-54页

作者： Shamaila Zia Klaus Spohrer Nikolaus Merkt Du Wenyong Xiongkui He Joachim Müller Institute of Agricultural Engineering Universität HohenheimStuttgartGermany Institute for Special Crop Cultivation and Crop Physiology Universität HohenheimStuttgartGermany Centre for Chemicals Application Technology(CCAT) China Agricultural UniversityBeijing 100083China

Grapevines are preferentially grown under mild to moderate water stress conditions to achieve the best compromise between wine quality and *** status detection for advanced irrigation scheduling is frequently done by predawn leaf water potential(ΨPD)or leaf stomata conductance(gL)***,these measurements are time and labor ***,the use of infrared thermography(IRT)opens up the possibility to study large population of leaves and to give an overview on the stomatal variation and their *** the present study IRT was used to identify water stress of potted *** order to define the sensitivity of IRT measurements to water stress,the IRT-based water status information were compared with simultaneously measuredΨPD and gL *** between IRT-based CWSI data on the one hand and gL andΨPD on the other showed the potential of IRT for water stress ***,the CWSI calculation procedure is laborious and the sensitivity of CWSI for water stress detection still needs to be ***,further improvements are necessary in order to apply remote IRT-based systems for irrigation scheduling in the field.

关键词： infrared thermography leaf temperature stomata conductance leaf water potential plant water stress and crop water stress index(CWSI)

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Effects of nitrogen nutritional stress on the morphological and yield parameters of tomato(Solanum lycopersicum L.)

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Research in Cold and Arid Regions 2015年第2期7卷 137-145页

作者： Gideon O.Okunlola Olusanya A.Olatunji Akinjide M.Afolabi Kolade K.Gbadegesin Department of Botany Obafemi Awolowo University Ile- Ife

This investigation was carried out to better understand the effects of nitrogen stress on the growth and yield of tomato （Solanum lycopersicon L.）. Seeds of S. lycopersicon （Ife No. 1 variety） were collected from the Osun-State Ministry of Agriculture, Oshogbo, Nigeria and planted in analyzed top soil. The plants were grown for a period of five weeks within which they were supplied with water and kept under optimum environmental conditions that enhanced normal growth. After this period, the plants were subjected to different levels of nitrogen stress which include： plants supplied with dis- tilled water only （n）, plants supplied with complete nutrient solution （N）, plants supplied with nutrient solution in which nitrogen concentration sources was increased by a factor of 5 （N5）, and plants supplied with nutrient solution in which nitrogen concentration sources was increased by a factor of 10 （N10）. Analysis of Variance （ANOVA） results shows that there is no significant effect of stress on the growth and morphological parameters of tomato plants. However, there was a significant effect of nitrogen stress on the yield parameters. Nitrogen stress also caused an increase in the number and size of fruits produced in plants subjected with high nitrogen concentration.

关键词： intracellular nitrogen stress Solanum lycopersicon stomata conductance transpiration

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