Higher maize yields and lower ammonia emissions by replacing synthetic nitrogen fertiliser with manure in the North China plain

文献类型： 外文期刊

第一作者： Fan, Bingqian

作者： Fan, Bingqian;Li, Jungai;Zhang, Yibin;Wang, Hongyuan;Zhai, Limei;Lei, Qiuliang;Wu, Shuxia;Liu, Hongbin;Fenton, Owen

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关键词： Agriculture; Environment; Farmland; Nitrogen; N-15 stable isotope

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.866； 五年影响因子：4.504 ）

ISSN： 1385-1314

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收录情况： SCI

摘要： Ammonia (NH3) emitted from synthetic nitrogen (N) fertiliser applications to farmland leads to air pollution and terrestrial acidification. Previous studies have indicated that replacing urea-based N fertilisers by manure may reduce NH3 emissions and enhance crop yield. However, the long-term effects of replacing urea N fertiliser by manure on crop yield and NH3 emissions have not been sufficiently quantified. The objective of the field study presented here was to examine the effects of three treatments (i.e., 100% synthetic fertiliser N application (NPK); 50% synthetic fertiliser N +50% manure N application (50%MNS); and 100% manure N application (100%MNS)) on NH3 emissions and maize grain yields over a 3-year period in a long term (13 years) study site in the North China Plain. Results showed that the NH3 emissions in the NPK treatment ranged from 9.7 to 11.7 kg ha(-1) during the three maize growing seasons. Replacement of urea fertiliser by manure significantly decreased the NH3 emissions by 22-54% in the 50% MNS treatment and by 47-71% in the 100%MNS treatment. Maize grain yields were 14-30% higher in the 50%MNS treatment and 17-45% higher in the 100% MNS treatment, compared to the NPK treatment (8.1-8.8 t ha(-1)). The NH3 emission factor for the NPK treatment ranged from 4.1 to 4.8%. Additional 15 N labelling work established that 83% of NH3 emissions originated from the urea fertiliser in the NPK treatment. Manure treatments had a higher maize N uptake and soil organic matter content, and a lower soil pH than the NPK treatment. This study highlights that replacing synthetic N fertiliser with manure on farmland in the North China Plain has long-term beneficial effects on maize yield and N uptake, NH3 emission mitigation and soil carbon storage.

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