内蒙古黄土高原区限量补灌对玉米光响应曲线及产量的影响

doi:10.12190/j.issn.2096-1197.2024.06.13

Abstract

Abstract: 【Objective】To explore the effects of different limited supplementary irrigation on the light response curve and yield of maize in the Loess Plateau region of Inner Mongolia,and determine the rational supplementary irrigation system of maize in this region.【Methods】 The experiment was conducted in Narin Orchard,Jungar Banner,Inner Mongolia from 2021 to 2022. Five supplementary irrigation amounts of 900 m³/hm²（W1）,1 050 m³/hm²（W2）,1 200 m³/hm²（W3）,1 350 m³/hm²（W4）,and 1 500 m³/hm²（CK） were set during the whole growth stage. The effects of different supplementary irrigation amounts on leaf area index,chlorophyll content,dry matter accumulation of maize during the whole growth stage,and light response curve of filling stage and yield were studied by 225 m³/hm² pre-seedling drip irrigation,150 m³/hm² drip irrigation at filling stage,and equal incremental drip irrigation（with an increasing gradient of 75 m³/hm²） at jointing stage and tasseling stage.【Results】Leaf area index,chlorophyll content,net photosynthetic rate and yield all increased first and then decreased with the increase of supplemental irrigation amount. With the development of growth stage,the leaf area index and chlorophyll content showed a parabolic shape,and the highest was found in the tasseling stage. During the two years,the leaf area index of maize under W3 treatment higher than W1,W2 treatment,and CK during the filling stage,average increases of 7.42%,3.85%,and 2.28% respectively;chlorophyll content under W3 treatment during filling stage and mature stage higher than W1,W2 treatment and CK,average increases of 9.73%,5.29%,and 13.19% respectively. In 2021,the dry matter accumulation of maize under W3 treatment was 1.89% lower than CK on average during tasseling stage,filling stage,and mature stage,while average reduction was 4.04% in 2022. In 2021 and 2022,W3 treatment maximum net photosynthetic rate increased by 12.00% and 7.69%,while apparent quantum efficiency increased of 7.55% and 19.57%,yield increased of 3.74% and 6.24% compared with CK,respectively.【Conclusion】Limited supplementary irrigation has a certain inhibitory effect on maize growth and development. W3 treatment（1 200 m³/hm²） showed significantly higher leaf area index,chlorophyll content,net photosynthetic rate and yield than CK,so it is a more appropriate supplemental irrigation amount for maize growth stage in the Loess Plateau region of Inner Mongolia.

Key words: Loess Plateau region of Inner Mongolia, Maize, Limited supplementary irrigation, Light response curve, Yield

CLC Number:

S513

BAI Zichen, GAO Hongyan, LI Yuyi, DU Erxiao, LI Baocheng, WANG Yanli, ZHAO Peiyi, LIU Yong, ZHANG Dequan, WANG Weini. Effects of limited supplementary irrigation on the light response curve and yield of maize in the Loess Plateau region of Inner Mongolia[J].Journal of Northern Agriculture, 2024, 52(6): 116-125.

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Effects of limited supplementary irrigation on the light response curve and yield of maize in the Loess Plateau region of Inner Mongolia

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