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Research ArticleResearch

Tillage and clover cover crop effects on grain sorghum yield and nitrogen uptake

R. G. Lemon, F. M. Hons and V. A. Saladino
Journal of Soil and Water Conservation January 1990, 45 (1) 125-127;
R. G. Lemon
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F. M. Hons
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V. A. Saladino
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ABSTRACT:

Winter annual legumes double-cropped with grain sorghum (Sorghum bicolor L. Moench) can potentially provide nitrogen (N) for the sorghum and enhance long-term sustainability. A 4-year experiment was conducted near College Station, Texas, to evaluate conventional disk tillage, no-till, and green manuring for their potential in grain sorghum production. Annual clovers were used in combination with both no-till and green manure methods, which were compared to conventional disk tillage without clover. Fertilizer rates of 0 and 60 kg N ha−1 (54 pounds/acre) were used on all treatments. The green manure treatment with no added N produced higher grain yields than the similar conventional disk tillage treatment in 3 of 4 years and was statistically equal to conventional disk tillage receiving 60 kg N ha−1 (54 pounds/acre) in 3 of 4 years. Yields from no-till treatments without N fertilizer never matched those from conventional disk tillage treatments with fertilizer. Green manuring of clover prior to sorghum planting apparently better approximated clover N mineralization to sorghum demand, resulting in greater grain production. Grain sorghum no-till planted into clover surface mulch cannot be recommended because N availability was not synchronous with plant demand.

Footnotes

  • R. G. Lemon was a graduate research assistant, F. M. Hons is an associate professor of soils, and V. A. Saladino is an agricultural research technician, Soil and Crop Sciences Department, Texas A&M University, College Station, 77843. Lemon currently is an extension associate, Texas Agricultural Extension Service, Texas A&M University. This article is a contribution from the Texas Agricultural Experiment Station, Texas A&M University.

  • Copyright 1990 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 45 (1)
Journal of Soil and Water Conservation
Vol. 45, Issue 1
January/February 1990
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Tillage and clover cover crop effects on grain sorghum yield and nitrogen uptake
R. G. Lemon, F. M. Hons, V. A. Saladino
Journal of Soil and Water Conservation Jan 1990, 45 (1) 125-127;

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Tillage and clover cover crop effects on grain sorghum yield and nitrogen uptake
R. G. Lemon, F. M. Hons, V. A. Saladino
Journal of Soil and Water Conservation Jan 1990, 45 (1) 125-127;
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