Water deficit affects the nitrogen nutrition index of winter wheat under controlled water conditions  

作　　者：Ben Zhao Anzhen Qin Wei Feng Xinqiang Qiu Pingyan Wang Haixia Qin Yang Gao Guojie Wang Zhandong Liu Syed Tahir Ata-Ul-Karim 

机构地区：[1]College of Tobacco Science,Henan Agricultural University,Zhengzhou 450002,China [2]Key Laboratory of Crop Water Use and Regulation,Ministry of Agriculture and Rural Affairs/Farmland Irrigation Research Institute,Chinese Academy of Agricultural Sciences,Xinxiang 453003,China [3]National Engineering Research Center for Wheat/State Key Laboratory of Wheat and Maize Crop Science,Henan Agricultural University,Zhengzhou 450002,China [4]Henan Provincial Water Conservancy Research Institute/Center of Efficient Irrigation Engineering and Technology Research of Henan Province,Zhengzhou 450002,China [5]Department of Plant Science,The Pennsylvania State University,State College,PA 16802,USA

出　　处：《Journal of Integrative Agriculture》2025年第2期724-738,共15页农业科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(51609247);the Henan Provincial Natural Science Foundation,China(222300420589,202300410553);the Central Public-interest Scientific Institution Basal Research Fund,China(FIRI2022-22);the Science&Technology Fundamental Resources Investigation Program,China(2022FY101601);the Science and Technology Project of Xinxiang City,Henan Province,China(GG2021024);the Major Special Science and Technology Project of Henan Province,China(221100110700);the Joint Fund of Science and Technology Research and Development Plan of Henan Province,China(Superior Discipline Cultivation)(222301420104)。

摘　　要：Nitrogen(N)uptake is regulated by water availability,and a water deficit can limit crop N responses by reducing N uptake and utilization.The complex and multifaceted interplay between water availability and the crop N response makes it difficult to predict and quantify the effect of water deficit on crop N status.The nitrogen nutrition index(NNI)has been widely used to accurately diagnose crop N status and to evaluate the effectiveness of N application.The decline of NNI under water-limiting conditions has been documented,although the underlying mechanism governing this decline is not fully understood.This study aimed to elucidate the reason for the decline of NNI under waterlimiting conditions and to provide insights into the accurate utilization of NNI for assessing crop N status under different water-N interaction treatments.Rainout shelter experiments were conducted over three growing seasons from 2018 to 2021 under different N(75 and 225 kg N ha^(-1),low N and high N)and water(120 to 510 mm,W0 to W3)co-limitation treatments.Plant N accumulation,shoot biomass(SB),plant N concentration(%N),soil nitrate-N content,actual evapotranspiration(ET_a),and yield were recorded at the stem elongation,booting,anthesis and grain filling stages.Compared to W0,W1 to W3 treatments exhibited NNI values that were greater by 10.2 to 20.5%,12.6to 24.8%,14 to 24.8%,and 16.8 to 24.8%at stem elongation,booting,anthesis,and grain filling,respectively,across the 2018-2021 seasons.This decline in NNI under water-limiting conditions stemmed from two main factors.First,reduced ET_(a) and SB led to a greater critical N concentration(%N_(c))under water-limiting conditions,which contributed to the decline in NNI primarily under high N conditions.Second,changes in plant%N played a more significant role under low N conditions.Plant N accumulation exhibited a positive allometric relationship with SB and a negative relationship with soil nitrate-N content under water-limiting conditions,indicating co-regulation by SB and the soil nitrate-N cont

关 键 词：critical nitrogen concentration shoot biomass plant nitrogen accumulation soil nitrate N concentration soil water content 

分 类 号：S512.11[农业科学—作物学]