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Straw mulching with inorganic nitrogen fertilizer reduces soil CO2 and N2O emissions and improves wheat yield.
- Source :
-
Science of the Total Environment . Nov2020, Vol. 741, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Nitrogen fertilization significantly increases greenhouse gases (GHGs) emission, when applied from inorganic or organic sources. Minimizing GHGs from agroecosystems without compromising crop yield for stabilization of green production systems remains a challenge. Being an integral component of wheat production technology, the nitrogen (N) application deems to be indispensable. Thus, to reduce the application of N fertilizer and keep in view the minimization of GHGs emission, without compromising soil fertility and wheat production, field experiments were performed with treatments included maize straw mulch (S1: 0, S2: 4500, S3: 9000 kg ha−1) and nitrogen fertilizer (N1: 0, N2: 192 and N3: 240 kg ha−1) during 2015–17. Results showed that the cumulative CO 2 and N 2 O emission from 9000 kg ha−1 of maize straw mulch with 192 kg N ha−1 (S3N2) significantly decreased by 0.67% and 33.7%, respectively, averaged over two years compared with that of 9000 kg ha−1 of maize straw mulch with 240 kg N ha−1 (S3N3). Likewise, the average soil moisture content significantly increased by 10% and 10.6% for S3N2 and S3N3 treatments at 0–10 cm soil depth, respectively, compared to S1N1. Similarly, the S3N2 and S3N3 treatments had lowered the soil temperature by 0.2 and 0.1 °C, respectively, over S1N1 in wheat grown fields. The grain yield of wheat was increased by 45% and 45% under S3N3 and S3N2 treatments than S1N1, respectively. The S3N2 treatment was more economical than S3N3 for wheat crop. Therefore, maize straw mulch (S3) combined with 20% less N fertilizer (N2) from commercial source were considered as a viable production technology to improve crop yield, and reduce soil CO 2 and N 2 O emissions. Unlabelled Image • Cumulative emission of soil NO 2 decreased by 9000 kg ha−1 straw with 192 kg N ha−1. • Global warming potential was more in 9000 kg ha−1 straw (S3) with 240 kg N ha−1. • Wheat yield were significantly increased by S3 with 20% less N fertilizer. • 9000 kg ha−1 of straw with 192 kg N ha−1 is recommended an eco-friendly approach. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00489697
- Volume :
- 741
- Database :
- Academic Search Index
- Journal :
- Science of the Total Environment
- Publication Type :
- Academic Journal
- Accession number :
- 145320937
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2020.140488