Effect of corn residue mulch and N fertilizer application on nitrous oxide (N2O) emission and wheat crop productivity under rain-fed condition of Loess Plateau China
2016
Tanveer, S.K. (Northwest A&F Univ., Yangling (China). Coll. of Agronomy) | Zhang, J. (Northwest A&F Univ., Yangling (China). Coll. of Agronomy) | Lu, X. (Northwest A&F Univ., Yangling (China). Coll. of Agronomy) | Wen, X. | Wu, W. | Liu, Y. | Yun-Cheng, L.
With the continuous use of N fertilizers for crop production, the emission of N2O is consistently increasing in the atmosphere. A field study was conducted to assess the effects of corn crop residue mulch and different N fertilizer levels i.e., 0, 80, 160, 240 and 320 kg N per ha respectively on the emissions of N2O and wheat crop productivity under the rain-fed condition of Loess Plateau China. Factorial experiment with three replications was used for this study. Maximum grain yield was recorded for 160, 240 and 320 kg N per ha, fertilizer level. Maximum emission of N2O was recorded during the first three weeks of planting wheat crop. Except for N fertilizer level of 240 kg N per ha, applications of mulch reduced the emission of N2O for 0, 80, 160 and 320 kg N per ha, N fertilizer levels. On cumulative basis, minimum emission of N2O was recorded in case of 80 kg N per ha N fertilizer level. Application of mulch increased the number of tillers and biological yields which ultimately resulted in more grain yields in all other N fertilizer treatments except for 240 kg N per ha. It can be concluded that the application of crop residue mulch along with the application of N fertilizer level from 80-160 kg N per ha has many environmental and economic benefits, because it reduces the emissions of N2O, increases crop production by increasing the soil moisture and similarly its use increases the soil fertility by increasing the soil organic carbon.
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