| Stem diameter variation characteristics during different growth stages of eggplant in greenhouse and its relation to meteorological factors |
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| DOI：10.7606/j.issn.1000-7601.2010.04.20 |
| Key Words: eggplant variation of stem diameter growth stage meteorological factor soil water content |
| Author Name | Affiliation | | WANG Xiaosen | Farmland Irrigation Research Institute, CAAS, Xinxiang, Henan 453003, China
Key Lab for Crop Water Requirement and Regulation，Ministry of Agriculture , Xinxiang，Henan 453003, China | | MENG Zhaojiang | Farmland Irrigation Research Institute, CAAS, Xinxiang, Henan 453003, China
Key Lab for Crop Water Requirement and Regulation，Ministry of Agriculture , Xinxiang，Henan 453003, China | | DUAN Aiwang | Farmland Irrigation Research Institute, CAAS, Xinxiang, Henan 453003, China
Key Lab for Crop Water Requirement and Regulation，Ministry of Agriculture , Xinxiang，Henan 453003, China | | LIU Zuguil | Farmland Irrigation Research Institute, CAAS, Xinxiang, Henan 453003, China
Key Lab for Crop Water Requirement and Regulation，Ministry of Agriculture , Xinxiang，Henan 453003, China |
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| Abstract: |
| In order to find a reliable index of stem variation to diagnose water content of crops in greenhouse, an
analysis was made of some key indexes of stem variation under high and low soil water content in greenhouse in spring. The result indicated that, the maximum daily shrinkage (MDS) of low soil water content was mostly bigger than that of high soil water content during three growth stages , but they both shared the same variation trend which was caused by me-teorological factors. Furthermore, there was no negative daily increase (DI) in seedling stage opposite to fluctuation above or below DI = 0 during the other two growth stages . In addition, the gross DI of high soil water content was bigger than that of low soil water content during seedling stage , and the relationship between MDS and DI was negative correlation too. Through regression analysis between MDS, DI and relative meteorological factors respectively, we found that MDS had a better correlation with meteorological factors than DI, and there were positive correlations of MDS to radia-tion, temperature, VPD and negative correlation to relative humidity , which influenced the low soil water content' s MDS more sharply than that of high soil water content. Because of the evidences above, we came up with the thought of estab-lishing a model under seemly soil water content between MDS and meteorological factors as the key point of diagnosing water content inner crops of greenhouse and opening the automatic irrigation system. |
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