Highly Arid Oasis Yield, Soil Mineral N Accumulation and N Balance in a Wheat-Cotton Rotation with Drip Irrigation and Mulching Film Management
文献类型： 外文期刊
作者： Lv, Jinling 1 ; Liu, Hua 4 ; Wang, Xihe 4 ; Li, Kaihui 1 ; Tian, Changyan 1 ; Liu, Xuejun 2 ;
作者机构： 1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
2.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China
3.Henan Acad Agr Sci, Inst Plant Nutr Resources & Environm Sci, Zhengzhou, Peoples R China
4.Xinjiang Acad Agr Sci, Soil & Fertilizer Inst, Urumqi 830000, Peoples R China
期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）
ISSN： 1932-6203
年卷期： 2016 年 11 卷 10 期
页码：
收录情况： SCI
摘要： Few systematic studies have been carried out on integrated N balance in extremely arid oasis agricultural areas. A two-year field experiment was conducted to evaluate the N input and output balances under long-term fertilization conditions. Five treatments were chosen, namely CK (no fertilizer), NPK, NPKS (10% straw return N and 90% chemical N), NPKM (one third urea-N, two thirds sheep manure) and NPKM+ (1.5 times NPKM). The results show an abundance of dry and wet N deposition (33 kg N ha(-1) yr(-1)) in this area. All treatments (excluding CK) showed no significant difference in wheat production (P>0.05). NPKM gave higher cotton yields (P<0.05). In both crops, NPKM and NPKS treatments had a relatively higher N harvest index (NHI). 15 N-labeled results reveal that the fertilizer N in all N treatments leached to<1 m depth and a high proportion of fertilizer-N remained in the top 60 cm of the soil profile. The NPKM+ treatment had the highest residual soil mineral N (N-min, 558 kg Nd ha(-1)), and NPKM and NPKS treatments had relatively low soil N-min values (275 and 293 kg N ha-1, respectively). Most of the treatments exhibited very high apparent N losses, especially the NPKM+ treatment (369kg N ha(-1)). Our arid research area had a strikingly high N loss compared to less arid agricultural areas. Nitrogen inputs therefore need careful reconsideration, especially the initial soil Nmin, fertilizer N inputs, dry and wet deposition, and appropriate organic and straw inputs which are all factors that must be taken into account under very arid conditions.
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