Crop-water relation and production of two soybean varieties under different water supplies

被引:10
|
作者
Anda, Angela [1 ]
Simon, Brigitta [1 ]
Soos, Gabor [1 ]
Teixeira da Silva, Jaime A.
Kucserka, Tamas [1 ]
机构
[1] Univ Pannonia, Dept Meteorol & Water Management, Georgikon Fac, POB 71, H-8361 Keszthely, Hungary
关键词
MAX L. MERR; CANOPY TEMPERATURE; STRESS INDEX; DEFICIT IRRIGATION; SEED YIELD; SOIL-WATER; EVAPOTRANSPIRATION; PERFORMANCE; MAIZE; THERMOGRAPHY;
D O I
10.1007/s00704-018-2660-9
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The estimation of evapotranspiration in a canopy rather than at the plant level is of interest to crop scientists. Information about the plant-water relationship at the canopy level permits better irrigation-related estimates. In addition, there is very limited proper instrumentation to measure evapotranspiration in water-stressed crops in trials under field conditions. The aim of this study was to estimate the evapotranspiration rates, canopy temperatures, T-c, crop water stress index (CWSI), and production of two soybean varieties using three water supply levels (unlimited water, 50% of water requirement in evapotranspirometers, and rainfed conditions). To date, there are no studies that have attempted to estimate the amount of water loss in stressed field-grown crops while operating converted evapotranspirometers. For each 0.1 increase in CWSI above 0.2, seed yield decreased by 434.1 +/- 28.8gm(-2). Mean CWSI and T-c data were inversely related to crop water use efficiency (WUE). WUE and CWSI showed a quadratic relationship, and the economic limit of CWSI was 0.62. T-c and CWSI could serve as indicators for selecting soybean varieties with different levels of stress tolerance. However, due to the short observation period in this study, results might be site-specific and should not be extrapolated to locations with completely different climatic conditions.
引用
收藏
页码:1515 / 1528
页数:14
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