15N fate in maize cropping system in response to black soil fertility improvement in China,Agronomy Journal

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15N fate in maize cropping system in response to black soil fertility improvement in China
Agronomy Journal ( IF 2.0 ) Pub Date : 2021-07-06 , DOI: 10.1002/agj2.20794
HaiMei Fu _{1,

2} , YingHua Duan ₁ , Ping Zhu ₃ , HongJun Gao ₃ , MingGang Xu ₁

Affiliation

Applications of high amounts of nitrogen (N) fertilizer are essential for obtaining sustainable maize (Zea mays L.) yields but also result in low N-use efficiency (NUE) and cause a series of environmental problems. To optimize fertilizer management, it is necessary to determine the effects of soil fertility improvement on NUE and the fate of N fertilizer. In this study, we conducted a ¹⁵N tracer pot experiment involving five different fertilizer treatments in soils with five different total organic carbon levels under field conditions. The average NUE ranged from 36 to 56% ¹⁵N-urea and 0.1 to 0.2% residual N in the first and second seasons. The N retained in the soil ranged from 10 to 28%, and the N lost to water and the atmosphere ranged from 29 to 39% in the five soils. Compared with that in the low-fertility soils, NUE in the high-fertility soils was 20–45% greater, and N loss was 1 –6% lower. The results showed that higher soil fertility corresponded to higher NUE and lower N loss. We suggest that although the local customary N fertilizer application rate (N3; 165 kg N/ha) in the study area is reasonable for low-fertility soils, after soil fertility improvements, an approximately 50% reduction of N fertilizer should be implemented.

更新日期：2021-07-06

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