Grain-filling characteristics and yield differences of maize cultivars with contrasting nitrogen efficiencies  

作　　者：Qiang Li Lunjing Du Dongju Feng Yun Ren Zhexin Li Fanlei Kong Jichao Yuan 

机构地区：[1]Chongqing Key Laboratory of Economic Plant Biotechnology,Collaborative Innovation Center of Special Plant Industry in Chongqing,Institute of Special Plants,Chongqing University of Arts and Sciences,Yongchuan,402160 Chongqing,China [2]Key Laboratory of Crop Ecophysiology and Farming System in Southwest China,Ministry of Agriculture,Sichuan Agricultural University,Chengdu 611130,Sichuan,China

出　　处：《The Crop Journal》2020年第6期990-1001,共12页作物学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2016YFD0300307 and 2016YFD0300209);the Special Fund for Agro-scientific Research in the Public Interest of China(20150312705);the Sichuan Agriculture Research System of Maize Industry。

摘　　要：To investigate the effect of nitrogen management on the grain-filling characteristics and yield formation of maize cultivars with contrasting nitrogen efficiencies,and to identify differences in grain-filling characteristics and yield of maize cultivars in response to nitrogen management,a two-year field experiment was conducted in southwest China in2015–2016.The grain-filling rate and duration of the N-inefficient cultivar XY 508 were higher than those of the N-efficient cultivar ZH 311.The 100-kernel weight of XY 508 was significantly higher than that of ZH 311.The kernel number per ear of ZH 311 was significantly higher than that of XY 508,making the population filling rate of ZH 311 significantly higher than that of XY 508.The higher population filling rate of the N-efficient maize cultivar led to a significant yield advantage over the N-inefficient maize cultivar.Nitrogen management effectively improved maize grain yield,but the response of maize cultivars with contrasting nitrogen efficiencies to nitrogen management was inconsistent.A basal fertilizer ratio 60.43%with a topdressing ratio 39.57%effectively increased grainfilling rate,delayed the time to maximum filling rate,prolonged the active filling period and effective grain-filling time,increased the 100-kernel weight,and maintained higher kernels per ear,thereby improving the population filling rate and maximizing the yield advantage of the N-efficient cultivar.A 100%basal fertilizer ratio not only increased the number of kernels per ear,but also maintained high grain filling characteristics to obtain a higher 100-kernel weight and increased the population filling rate,leading to a high grain yield in the N-inefficient cultivar.Thus,the 100%basal fertilizer ratio partially compensated for the deficient grain yield of the N-inefficient cultivar.

关 键 词：MAIZE Grain filling Nitrogen management YIELD Population filling rate 

分 类 号：S513[农业科学—作物学]