| Effect of drip irrigation on photosynthetic characteristics and yield of spring wheat in south Xinjiang |
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| DOI：10.7606/j.issn.1000-7601.2012.04.08 |
| Key Words: spring wheat drip irrigation photosynthetic characteristics yield |
| Author Name | Affiliation | | WANG Jichuan | College of Plant Science, Tarim University, Alar, Xinjiang 843300, China | | GAO Shan | College of Plant Science, Tarim University, Alar, Xinjiang 843300, China | | XU Yali | College of Plant Science, Tarim University, Alar, Xinjiang 843300, China | | HAN Xiufeng | College of Plant Science, Tarim University, Alar, Xinjiang 843300, China |
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| Abstract: |
| The response of photosynthetic characteristics and yield of spring wheat to different drip irrigation amount was studied and the results showed that, limited drip irrigation (mild deficiency and serious deficiency) caused soil moisture deficit in wheat field, the single leaf photosynthetic speed (Pn) and the canopy apparent photosynthesis (CAP) reduced, and at flowering stage, the single leaf transpiration rate (Tr) and the canopy respiration rate (CR) were also lower than those in moderate drip irrigation. The diurnal variation of Pn in limited drip irrigation treatment had a distinct “nap” that significantly influenced assimilation function of leaves. The excessive irrigating accelerated vegetative growth, Pn, CAP, CR and canopy leaf s
ource capacity (CLSC) were higher, but soon dropped quickly in later period, which did not favor yield forming efficiently. In suitable drip irrigation treatment (3 750 m3/hm2), because the photosynthetic functions of single leaf and canopy were at optimized condition, Pn, WUE, CAP, CR and CLSC maintained higher lever in later period (filling stage) that guaranteed nutrient demand of grain growing and grouting, so the yield was the highest. |
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