Establishment of critical nitrogen-concentration dilution curves based on leaf area index and aboveground biomass for drip-irrigated spring maize in Northeast China  

作　　者：Linli Zhou Bo Ming Keru Wang Dongping Shen Liang Fang Hongye Yang Jun Xue Ruizhi Xie Peng Hou Jianquan Ye Jinghui Yu Ting Zhang Guoqiang Zhang Shaokun Li 

机构地区：[1]The Key Laboratory of Oasis Eco-agriculture,Xinjiang Production and Construction Group,College of Agronomy,Shihezi University,Shihezi 832000,Xinjiang,China [2]Institute of Crop Sciences,Chinese Academy of Agricultural Sciences/State Key Laboratory of Crop Gene Resources and Breeding,Beijing 100081,China [3]Tongliao Agriculture and Animal Husbandry Development Center,Tongliao 028000,Inner Mongoli1,China

出　　处：《The Crop Journal》2025年第2期556-564,共9页作物学报(英文版)

基　　金：supported by the grants from National Key Research and Development Program of China(2023YFD2303300);China Agriculture Research System(CARS-02-15);the Agricultural Science and Technology Innovation Program(CAAS-ZDRW202004).

摘　　要：The unreasonable application of nitrogen fertilizer poses a threat to agricultural productivity and the environment protection in Northeast China.Therefore,accurately assessing crop nitrogen requirements and optimizing fertilization are crucial for sustainable agricultural production.A three-year field experiment was conducted to evaluate the effects of planting density on the critical nitrogen concentration dilution curve(CNDC)for spring maize under drip irrigation and fertilization integration,incorporating two planting densities:D1(60,000 plants ha^(-1))and D2(90,000 plants ha^(-1))and six nitrogen levels:no nitrogen(N0),90(N90),180(N180),270(N270),360(N360),and 450(N450)kg ha^(-1).A Bayesian hierarchical model was used to develop CNDC models based on dry matter(DM)and leaf area index(LAI).The results revealed that the critical nitrogen concentration exhibited a power function relationship with both DM and LAI,while planting density had no significant impact on the CNDC parameters.Based on these findings,we propose unified CNDC equations for maize under drip irrigation and fertilization integration:Nc=4.505DM-0.384(based on DM)and Nc=3.793LAI-0.327(based on LAI).Additionally,the nitrogen nutrition index(NNI),derived from the CNDC,increased with higher nitrogen application rates.The nitrogen nutrition index(NNI)approached 1 with a nitrogen application rate of 180 kg ha^(-1)under the D1 planting density,while it reached 1 at 270 kg ha^(-1)under the D2 planting density.The relationship between NNI and relative yield(RY)followed a“linear+plateau”model,with maximum RY observed when the NNI approached 1.Thus,under the condition of drip irrigation and fertilization integration in Northeast China’s spring maize production,the optimal nitrogen application rates for achieving the highest yields were 180 kg ha^(-1)at a planting density of 60,000 plants ha^(-1),and 270 kg ha^(-1)at a density of 90,000 plants ha^(-1).The CNDC and NNI models developed in this study are valuable tools for diagnosing nitrogen nutrition

关 键 词：Drip irrigation fertigation integration Spring maize Bayesian analysis Critical nitrogen concentration dilution curve Nitrogen nutrition index 

分 类 号：S513[农业科学—作物学]