Effects of irrigating water quotas on growth and grain yield of summer maize under deficit irrigation
QIU Xinqiang1,2, WANG Yanping1,2, HE Gang1,2, QIN Haixia1,2, ZHANG Yushun1,2, LU Zhenguang1,2*
1.Henan Provincial Water Conservancy Research Institute, Zhengzhou, Henan 450003, China; 2.Center of Efficient Irrigation Engineering and Technology Research of Henan Province, Zhengzhou, Henan 450003, China
Abstract:In order to seek the reasonable water-saving and high efficiency irrigation indexes of summer maize, lysimeter experiments were imposed to study the variation of two agronomic characters, grain yield and water use efficiency(WUE)under four irrigating water quotas and two soil water deficits. The results show that the leaf area index(LAI)of the early stage of summer maize is increasing with the increase of irrigating water quotas, and the normal plant height can still be guaranteed by timely rewatering after light drought. The water consumption and grain yield decrease with the increase of drought severity, but there is no trend change with the increase or decrease of irrigating water quotas. The WUE is generally higher under irrigating water quota 75, 90 and 105 mm, invariably light drought treatments can attain higher WUE under the same irrigating water quotas. In combination with actual production, with the goal of high yield and high moisture productivity, It is recommended that irrigating water quota 60 mm before jointing and 75 mm after jointing as reasonable water-saving irrigating water quotas, 45% field capacity(FC)at the seedling stage, 50%-55% FC at the jointing stage, 60% FC at the tasseling stage, and 50%FC during the grain filling period as reasonable lower limit of irrigation control.
邱新强,, 王艳平,, 和刚,, 秦海霞,, 张玉顺,, 路振广,*. 调亏模式下灌水定额对夏玉米生长及产量的影响[J]. 排灌机械工程学报, 2018, 36(8): 673-678.
QIU Xinqiang,, WANG Yanping,, HE Gang,, QIN Haixia,, ZHANG Yushun,, LU Zhenguang,*. Effects of irrigating water quotas on growth and grain yield of summer maize under deficit irrigation. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(8): 673-678.
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