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Combined effect of biochar and nitrogen fertilizer reduction on rapeseed productivity and nitrogen use efficiency

文献类型： 外文期刊

作者： Tian, Xiaoqin 1 ; Li, Zhuo 2 ; Liu, Zidan 2 ; Wang, Yifan 1 ; Li, Biao 1 ; Zhang, Kangping 1 ; Xu, Qiwen 1 ; Wang, Longch 1 ;

作者机构： 1.Southwest Univ, Coll Agron & Biotechnol, 2 Tiansheng Rd, Chongqing 400715, Peoples R China

2.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu, Sichuan, Peoples R China

关键词： Rapeseed; biochar; yield; residual effectiveness; nitrogen use efficiency

期刊名称：ARCHIVES OF AGRONOMY AND SOIL SCIENCE （ 影响因子：3.092； 五年影响因子：2.745 ）

ISSN： 0365-0340

年卷期：

页码：

收录情况： SCI

摘要： Biochar has the potential to effectively improve yield and nitrogen use efficiency (NUE) of upland crops in different soil types. However, it is unclear for rapeseed in purple soil under N reduction. A 2 years field experiment was conducted in southwest China, to evaluate the combined effects of nitrogen (180, 144 and 108 kg ha(-1), named N-100, N-80 and N-60, respectively) and biochar (0, 10, 20 and 40 t ha(-1), named B-0, B-10, B-20 and B-40, respectively) on rapeseed growth, NUE and yield. Compared with B-0, B-10 significantly improved growth, NUE and yield, while nitrogen reduction had an opposite effect. The better management practices were N80B10 and N100B10, which increased NUE by 10.0% and 10.2%, and grain yield by 16.1% and 21.8%, respectively, compared with N100B0. Path analysis revealed that effective pods and root surface area, root volume had significant and direct path coefficients with variances in seed yield and NUE, respectively. Besides, positive residual effectiveness of biochar was preserved for at least 2 years. This study indicated that B-10 could replace 20% nitrogen to promote rapeseed root development and yield formation, thus achieving both high yield and high NUE for at least 2 years in upland purple soil.

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