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- W2416133040 abstract "Leguminous cover crop systems have been envisaged as a critical component of sustainable agriculture because of their potential to increase soil productivity by cycling C and N in agricultural systems. Our objectives were to: (i) determine the effects of including summer cover crops and N rates in the cropping system on the growth and yield of the succeeding grain sorghum [Sorghum bicolor (L.) Moench] crop, (ii) calculate the N fertilizer replacement value (NFRV) and evaluate economic returns, and (iii) determine the most cost-effective cropping system. Field experiments were conducted for two seasons in Kansas. Leguminous summer cover crops and double-cropped soybean [Glycine max (L.) Merr.] residues improved soil N availability; N was subsequently used by the succeeding crop. Across years and cropping systems, the mean increases in grain yield as a result of including cowpea [Vigna unguiculata (L.) Walp.], pigeonpea [Cajanus cajan (L.) Millsp.], sunn hemp (Crotalaria juncea L.), double-cropped soybean, and double-cropped grain sorghum in the rotation compared with a fallow system with 0 kg N ha−1 were 56, 62, 43, 32, and 3%, respectively, and NFRVs across the years were 53, 64, 36, 27, and –3 kg N ha−1, respectively. Across years, grain sorghum in a double-cropped soybean system and a fallow system with 90 kg N ha−1 gave profitable economic net returns. We conclude that including leguminous cover crops in a cropping system has the potential to reduce N requirements and improve the N availability and grain yield of the succeeding grain sorghum crop." @default.
- W2416133040 created "2016-06-24" @default.
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- W2416133040 date "2016-01-01" @default.
- W2416133040 modified "2023-10-16" @default.
- W2416133040 title "Cover Crops, Fertilizer Nitrogen Rates, and Economic Return of Grain Sorghum" @default.
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- W2416133040 doi "https://doi.org/10.2134/agronj15.0135" @default.
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