No and no emissions as affected by the continuous combined application of organic and mineral n fertilizer to a soil on the North China plain
Agronomy, ISSN: 2073-4395, Vol: 10, Issue: 12
2020
- 18Citations
- 27Captures
- 1Mentions
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Article Description
A field experiment was conducted to evaluate the influence of the continuous application of organic and mineral N fertilizer on NO and NO emissions under maize and wheat rotation on the North China Plain. This study included eight treatments: no fertilizer (control); mineral N fertilizer (Nmin) at a rate of 200 kg N ha per season; 50% mineral fertilizer N plus 50% cattle manure N (50% CM), 50% chicken manure N (50% FC) or 50% pig manure N (50% FP); 75% mineral fertilizer N plus 25% cattle manure N (25% CM), 25% chicken manure N (25% FC) or 25% pig manure N (25% FP). The annual NO and NO emissions were 2.71 and 0.39 kg N ha, respectively, under the Nmin treatment, with an emission factor of 0.50% for NO and 0.07% for NO. Compared with the Nmin treatment, NO emissions did not differ when 50% of the mineral N was replaced with manure N (50% CM, 50% FC and 50% FP), while annual NO emissions were significantly reduced by 49.0% and 27.8% under 50% FC and 50% FP, respectively. In contrast, annual NO emissions decreased by 21–38% compared to the Nmin treatment when 25% of the mineral N was replaced with manure N (25% CM, 25% FC and 25% FP). Most of the reduction occurred during the maize season. The 25% CM, 25% FC and 25% FP treatments had no effect on NO emissions compared to the Nmin treatment. There was no obvious difference in annual NO and NO emissions among the organic manures at the same application rate, probably due to their similar C/N ratio. Replacing a portion of the mineral fertilizer N with organic fertilizer N did not significantly affect crop grain yield, except for the 50% FC treatment in the wheat season. Overall, the results suggest that the combined application of 25% organic manure N plus 75% mineral fertilizer N had the most potential to mitigate NO emissions while not affecting crop yield in the maize and wheat rotation system in this area of China.
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