EFFECT OF NITROGEN MANAGEMENT ON PRODUCTIVITY, NITROGEN USE EFFICIENCY AND NITROGEN BALANCE FOR A WHEAT-MAIZE SYSTEM

Author: He Ping   Sha Zhimin   Yao Dongwei   Xing Suli   Zhou Wei  

Publisher: Taylor & Francis Ltd

ISSN: 0190-4167

Source: Journal of Plant Nutrition, Vol.36, Iss.8, 2013-01, pp. : 1258-1274

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Abstract

Over-application of nitrogen (N) in North Central China is primary reasons for yield restriction and low nutrient use efficiencies. This study was to determine N management practices on grain yield, N efficiency, and N balance in China. Results from four season crops indicated that no significant yield differences across different N rates for the first season wheat were observed. Treatments with N rates lower than 75 kg N ha−1 manifested yield reduction for the following seasons, and no much yield differences existed for the rest treatments. The accumulated N recovery efficiency (NREac) values ranged from 10.1% to 44.2% over the four seasons, and over N fertilization led to low NREac. The net N balance increased with N applied. Results from current study provided the proof that in the current rotation system the N150N150 treatment was the best economic treatment for achieving both higher yield and N use efficiency.