EFFECT OF NITROGEN MANAGEMENT ON PRODUCTIVITY,NITROGEN USE EFFICIENCY AND NITROGEN BALANCE FOR A WHEAT-MAIZE SYSTEM |
| |
| Authors: | Ping He Zhimin Sha Dongwei Yao Suli Xing Wei Zhou |
| |
| Institution: | 1. Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization , Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences , Beijing , China;2. International Plant Nutrition Institute China Program , Beijing , China;3. Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization , Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences , Beijing , China;4. Institute of Agricultural Resources and Environment, Hebei Academy of Agriculture and Forestry Sciences , Shijiazhuang , China |
| |
| 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. |
| |
| Keywords: | N management over fertilization yield nitrogen use efficiency N balance |
|
|
