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| DOI： |
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| Using Variation in Stem Diameter as an Indicator to Diagnose Water Deficiency of Maize at Jointing Stage |
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LI Taolong, HU Xiaotao, WANG Ping, DU Bin
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Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling 712100, China
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| Abstract: |
| We investigated the feasibility of using variation in stem diameter as an indication to diagnose water deficiency in maize at jointing stage based on pot experiment. During the experiment, the daily variations in maximum stem diameter shrinkage (MDS), increase in the diameter (DI) and recovering time (RT) for the diameter under three different treatments, as well as their relationships with soil moisture content were measured. The results showed that: ① MDS and DI under different treatments were impacted by water deficiency and the response of RT to soil water content was consistent in all three treatments; ②MDS and DI were affected by environments rather than by soil moisture content; ③the correlation coefficient between RT and soil moisture content was high and was consistent in all treatments. Compared with MDS and DI, RT is a robust indicator to diagnose water stress. |
| Key words: maize; stem diameter; weather factor; diagnosis index |
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