%0 Journal Article %A Jibo ZHANG %A Nan LI %A Can QIU %A Xiaoping XUE %T Effect of Continuous Drought Stress During Critical Period of Water on Photosynthetic Physiology and Yield Formation of Summer Maize %D 2021 %R 10.11755/j.issn.1006-7639(2021)-05-0734 %J Journal of Arid Meteorology %P 734-741 %V 39 %N 5 %X

The experiment was conducted during the growth season of summer maize in 2018 in moisture control field of automatic control rain shelter in agriculture meteorological test station of Linyi. With ‘Zhengdan 958’ (ZD958) as test material, five-gradient water control tests were designed during the critical period of water (jointing to blooming stage). The effects of continuous drought stress on photosynthetic physiology and yield formation of summer maize in the critical period of water were simulated and studied. The results show that the leave chlorophyll a content, net photosynthetic rate, stomatal conductance, transpiration rate and plant height, leaf area, total dry weight above ground parts of summer maize at the flowering stage decreased under continuous drought stress during the water critical period, and the heavier drought stress was, the greater reduction was. The above elements under T5 treatment were 42.6%, 75.5%, 83.2%, 65.1%, 27.5%, 18.2% and 44.9% lower than those under T1 treatment in turn. The water use efficiency of summer maize leaves increased firstly and then decreased with the intensification of drought stress, and it reached the highest under light drought stress. Under continuous drought stress, the nutrient allocation of maize leaves and sheaths increased, while the nutrient supply of stems, fruits and roots decreased, which wasn’t conducive to healthy growth of summer maize, the risk of lodging increased, and the yield formation was difficult. In addition, the continuous drought stress also caused increase of bald tip ratio and double spike rate of summer maize and significant decrease of 100-kernel weight and theoretical yield.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2021)-05-0734