Defensive effect of irrigation at different stage on hot dry wind stress on winter wheat
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Key Words: winter wheat  hot dry wind  irrigation time  irrigation amount  irrigation efficiency  production
Author NameAffiliation
ZHAO Hua-rong Chinese Academy of Meteorological Sciences, Beijing 100081, China 
REN San-xue Chinese Academy of Meteorological Sciences, Beijing 100081, China 
QI Yue The Institute of Arid Meteorology, China Meteorological Administration/Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster/Key Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Lanzhou, Gansu 730020, China 
TIAN Xiao-li China Academy of Meteorological Sciences (Gucheng) Ecological Environment and Agro-meteorology Test Station, Baoding, Hebei 072656, China 
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      Hot dry wind is one of the meteorological factors causing the annual fluctuation of wheat yield. Pre-disaster defense can effectively mitigate the damage caused by disasters. When the hot dry wind occurs, it will cause irreversible physiological harm to the wheat plant and the grain filling in the kernel, and the pre-disaster irrigation is an effective measure to prevent the occurrence of the disaster. In order to master the key development period of irrigation water and appropriate irrigation water, during the heading stage of winter wheat, flowering and milking, the irrigation of 100 mm and 150 mm were respectively tested in the waterproof canopy and natural field. The results showed thatat the flowering stage, the incidence of hot dry air spikes and the grain weight per panicle of 100 mm and 150 mm irrigation fields were about 30% and 3% higher than that of the covered, which was 18.03% and 15.14% lower than that of the control.Regardless of the flowering stage or the heading-filling stage, the 1000-grain weight from the irrigation treatment was significantly greater than that of the control.In the rainproof shed, the 1000-grain weight gradually increased with increasing irrigation time, while the natural field had the largest 1000-grain weight in the flowering stage, which was 47.664 g.The irrigation efficiency was naturally higher than that of the rainproof shed, and the irrigation efficiency was the highest at the flowering stage, which was 4.110 g·m-2·mm-1. The irrigation efficiency of the rain shed irrigation of 150mm was about 0.2 g·m-2·mm-1 higher than that with 100mm, while the natural field was regulated by natural precipitation to regulate soil moisture. The irrigation efficiency of irrigation of 150mm was 0.565~1.301 g·m-2·mm-1 lower than that of 100mm.The effect of irrigation on the dry and hot air defense effect was obvious, and the natural field was more prominent than the canopy, and the effect was most significant in the flowering period. Therefore, the accurate climate prediction and agricultural meteorological service of hot dry wind should be paid attention to, and it can effectively defend and mitigate the loss of hot dry wind on the winter wheat before the disaster.