文献类型： 外文期刊

作者： Duan Ying-hua ¹ ; Shi Xiao-jun ² ; Li Shuang-lai ³ ; Sun Xi-fa ⁴ ; He Xin-hua ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr, Key Lab Crop Nutr & Fertilizat, Beijing 100081, Peoples R China

2.Southwest Agr Univ, Coll Resources & Environm, Chongqing 400716, Peoples R China

3.Hubei Acad Agr Sci, Inst Plant Protect & Soil Sci, Wuhan 430064, Peoples R China

4.Sichuan Acad Agr Sci, Soil & Fertilizer Inst, Chengdu 610066, Peoples R China

5.Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia

关键词： apparent nitrogen balance;grain yield;nitrogen agronomic efficiency;nitrogen loss;soil nitrogen accumulation

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2014 年 13 卷 3 期

页码：

收录情况： SCI

摘要： Improving nitrogen use efficiency (NUE) and decreasing N loss are critical to sustainable agriculture. The objective of this research was to investigate the effect of various fertilization regimes on yield, NUB, N agronomic efficiency (NAE) and N loss in long-term (16- or 24-yr) experiments carried out at three rice-wheat rotation sites (Chongqing, Suining and Wuchang) in subtropical China Three treatments were examined: sole chemical N, N+phosphorus (NP), and NP+potassium (NPK) fertilizations. Grain yields at three sites were significantly increased by 9.3-81.6% (rice) and 54.5-93.8% (wheat) under NP compared with N alone, 1.7-9.8% (rice) and 0-17.6% (wheat) with NPK compared with NP. Compared to NP, NUB significantly increased for wheat at Chongqing (9.3%) and Wuchang (11.8%), but not at Suining, China. No changes in NUE were observed in rice between NP and NPK at all three sites. The rice-wheat rotation's NAB was 3.3 kg kg(-1) higher under NPK than under NP at Chongqing, while NAB was similar for NP and NPK at Suining and Wuchang. We estimated that an uptake increase of 1.0 kg N ha(-1) would increase 40 kg rice and 30 kg wheat ha(-1). Nitrogen loss/input ratios were similar to 60, similar to 40 or similar to 30% under N, NP or NPK at three sites, indicating significant decrease of N loss by P or PK additions. We attribute part of the increase in NUE soil N accumulation which significantly increased by 25-55 kg ha(-1) yr(-1) under NPK at three sites, whereas by 35 kg ha(-1) yr(-1) under NP at Chongqing only. This paper illustrates that apply P and K to wheat, and reduce K application to rice is an effective nutrient management strategy for both the NUB improvement and N losses reduction in China.