Effects of N fertilizer rate and planting density on short-season cotton yield, N agronomic efficiency and soil N using N-15 tracing technique

文献类型： 外文期刊

第一作者： Luo, Zhen

作者： Luo, Zhen;Hu, Qiuyue;Tang, Wei;Wang, Xiaowen;Lu, Hequan;Kong, Xiangqiang;Hu, Qiuyue;Wang, Xiaowen;Kong, Xiangqiang;Zhang, Zhuo;Liu, Tao

作者机构：

关键词： Nitrogen fertilizer rate; Planting density; Cotton; NAE; N balance

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.722； 五年影响因子：6.384 ）

ISSN： 1161-0301

年卷期： 2022 年 138 卷

页码：

收录情况： SCI

摘要： Straw returning has been widely used as a nitrogen (N) reduction measure in the North China Plain in recent years. However, little is known of the optimal planting density and N application rate of cotton under straw returning. In order to study the effect of the planting density and N application rate on cotton yield, nitrogen agronomic efficiency (NAE), fertilizer N recovery efficiency (FNRE), N balance and soil N under straw returning, a split-plot design in randomized complete blocks was used in the experiment. The main plots were assigned to plant densities (4.50 x 104, 6.75 x 104 and 9.00 x 104 plants hm-2), and the subplots to N application rates (0, 180, 225 and 270 kg N hm-2). The results showed that the biological yield increased as the planting density and the N application rate increase, but the harvest index decreased. Therefore, the highest biological yield was found under D9.00N270, but the highest cotton yield was found under D6.75N225. Excessive N (N270) application rate was not conducive to the improvement of NAE and FNRE. The amounts of plant N derived from fertilizer (Ndff) was reduced with the increase of planting density. Therefore, soil N would be consumed because the N balance was a negative value when N application rate was decreased at N180, especially at high density. The N balance was closest to zero at D6.75N225. In summary, with the yield, NAE, FNRE, N balance and the stability of soil N taken into consideration, the optimal combination of planting density and N application rate in the North China Plain was D6.75N225, because this treatment had the highest cotton yield, and most importantly, it maintained sustainable cotton production in the field.

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