Grain yield and N uptake of maize in response to increased plant density under reduced water and nitrogen supply conditions  

作　　者：Jingui Wei Qiang Chai Wen Yin Hong Fan Yao Guo Falong Hu Zhilong Fan QimingWang 

机构地区：[1]State Key Laboratory of Aridland Crop Science,Lanzhou 730070,China [2]College of Agronomy,Gansu Agricultural University,Lanzhou 730070,China [3]College of Life Sciences,Northwest Normal University,Lanzhou 730070,China

出　　处：《Journal of Integrative Agriculture》2024年第1期122-140,共19页农业科学学报（英文版）

基　　金：financial support of the National Natural Science Foundation of China(U21A20218 and 32101857);the‘Double First-Class’Key Scientific Research Project of Education Department in Gansu Province,China(GSSYLXM-02);the Fuxi Young Talents Fund of Gansu Agricultural University,China(Gaufx03Y10);the“Innovation Star”Program of Graduate Students in 2023 of Gansu Province,China(2023CXZX681)。

摘　　要：The development of modern agriculture requires the reduction of water and chemical N fertilizer inputs.Increasing the planting density can maintain higher yields,but also consumes more of these restrictive resources.However,whether an increased maize density can compensate for the negative effects of reduced water and N supply on grain yield and N uptake in the arid irrigated areas remains unknown.This study is part of a long-term positioning trial that started in 2016.A split-split plot field experiment of maize was implemented in the arid irrigated area of northwestern China in 2020 to 2021.The treatments included two irrigation levels:local conventional irrigation reduced by 20%(W1,3,240 m^(3)ha^(-1))and local conventional irrigation(W2,4,050 m^(3)ha^(-1));two N application rates:local conventional N reduced by 25%(N1,270 kg ha^(-1))and local conventional N(360 kg ha^(-1));and three planting densities:local conventional density(D1,75,000 plants ha^(-1)),density increased by 30%(D2,97,500 plants ha-1),and density increased by 60%(D3,120,000 plants ha^(-1)).Our results showed that the grain yield and aboveground N accumulation of maize were lower under the reduced water and N inputs,but increasing the maize density by 30% can compensate for the reductions of grain yield and aboveground N accumulation caused by the reduced water and N supply.When water was reduced while the N application rate remained unchanged,increasing the planting density by 30% enhanced grain yield by 13.9% and aboveground N accumulation by 15.3%.Under reduced water and N inputs,increasing the maize density by 30% enhanced N uptake efficiency and N partial factor productivity,and it also compensated for the N harvest index and N metabolic related enzyme activities.Compared with W2N2D1,the N uptake efficiency and N partial factor productivity increased by 28.6 and 17.6%under W1N1D2.W1N2D2 had 8.4% higher N uptake efficiency and 13.9% higher N partial factor productivity than W2N2D1.W1N2D2 improved urease activity and nitrate reductase activit

关 键 词：water and N reduction plant density MAIZE grain yield N uptake compensation effect 

分 类 号：S513[农业科学—作物学]