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- W2897799360 abstract "Cover crops (CC) provide many benefits for the soil and the following crop but their effects on nitrogen (N) release and balance in continuous no-tillage soybean (Glycine max L. Merr.) production are little known. Estimation of the biological nitrogen fixation (BNF) in intensive agricultural systems under soybean is essential to understanding the N dynamics and to determining the balances and crop demands. This study (2006–2011) was performed on a Typic Argiudoll under no-tillage in the province of Santa Fe, Argentina. The aims were to study the effect of fall winter CC, such as wheat (W), oats (O), oats + vetch (O + V) and vetch (V), on the yield and N-content of the following crop (soybean) and to quantify the contribution of the BNF and N-balance. Three methodologies were used for BNF estimation: 1) a linear regression model between BNF and N-uptake by soybean; 2) the natural 15N abundance in soybean and 3) the average BNF in the Pampa region. Gramineous CC developed more dry matter than pure legume species, with intermediate values for the gramineous-legume mixture. Biological fixation provides 60–70% of absorbed N, according to the estimation method. Within the rainfall range of 500–1000 mm during the soybean cycle, CC did not affect the grain yield or soybean dry matter production. The partial N-balance was always positive, with differences between the techniques used for BNF estimation. Cover crops have contributed to the positive soil N-balance. Gramineous CC stored 22% more N-content in the soil surface layer than the others. Cover crops showed 15% higher index of N-stratification on the surface compared to the control soil. Using CC would be an efficient alternative to produce biomass and to supply N to the soil for the subsequent crop." @default.
- W2897799360 created "2018-10-26" @default.
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- W2897799360 date "2019-01-01" @default.
- W2897799360 modified "2023-10-06" @default.
- W2897799360 title "Nitrogen balance in a plant-soil system under different cover crop-soybean cropping in Argentina" @default.
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- W2897799360 doi "https://doi.org/10.1016/j.apsoil.2018.10.005" @default.
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