[Effect of Organic Fertilizer and Inorganic Fertilizer Application on N2O Emissions from Fluvo-aquic Soil in the North China Plain]

He-Yang Sun; Zhong-Mei Wan; De-Yan Liu; Xia Liao; Wei-Xin Ding

doi:10.13227/j.hjkx.201908008

[Effect of Organic Fertilizer and Inorganic Fertilizer Application on N₂O Emissions from Fluvo-aquic Soil in the North China Plain]

Huan Jing Ke Xue. 2020 Mar 8;41(3):1474-1481. doi: 10.13227/j.hjkx.201908008.

[Article in Chinese]

Authors

He-Yang Sun^{1

2}, Zhong-Mei Wan¹, De-Yan Liu², Xia Liao^{2

3}, Wei-Xin Ding²

Affiliations

¹ College of Earth Sciences, Jilin University, Changchun 130061, China.
² State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
³ University of Chinese Academy of Sciences, Beijing 100049, China.

PMID: 32608651
DOI: 10.13227/j.hjkx.201908008

Abstract

The North China Plain is an important grain production area in China. Due to the low content of soil organic carbon, increasing the application rate of nitrogen fertilizer would not lead to a continuous increase of maize yield at present. The combined application of organic fertilizer and inorganic fertilizer is widely regarded as a measure to simultaneously increase grain yield and soil organic carbon; however, the effect of organic fertilizer and inorganic fertilizer application on N₂O emissions from farmland in the North China Plain is unclear. Here, N₂O emissions and crop yields in cropland under the combined application of different types and rates of organic fertilizers plus inorganic N fertilizer were measured in the North China Plain. The field experiment included eight treatments:no N fertilizer (CK), inorganic fertilizer (NPK), 40% cow manure N plus 60% inorganic fertilizer N (CM), 40% chicken manure N plus 60% inorganic fertilizer N (FC), 40% pig manure N plus 60% inorganic fertilizer N (FP), 20% cow manure N plus 80% inorganic fertilizer N (1/2CM), 20% chicken manure N plus 80% inorganic fertilizer N (1/2FC), and 20% pig manure N plus 80% inorganic fertilizer N (1/2FP). The N₂O fluxes were significantly correlated with soil water-filled pore space during the maize season (P<0.05). There was a significant linear relationship between N₂O fluxes and soil dissolved organic carbon content during the maize season in all treatments except the NPK treatment. In the maize season, N₂O emission was 0.50 kg·hm^-2 under CK treatment, and increased to 2.28 kg·hm^-2 under NPK treatment. However, when the proportion of manure N to total N applied was reduced from 40% to 20%, N₂O emissions were significantly reduced by 33.6%, 43.7%, and 12.1% under 1/2CM, 1/2FC, and 1/2FP treatments, respectively. The difference in application rate of organic manure N did not significantly affect maize yield. The reduction of N₂O emission at the low manure application rate compared with the high manure application rate was likely due to the decrease in dissolved organic carbon in soils.

Keywords: N2O emissions; North China Plain; crop yield; fluvo-aquic soil; organic fertilizer.

Publication types

English Abstract