Effect of Sorghum Residue Management on Yields of Nitrogen and Dry Matter in Subsequent Crops1
- James R. Thomas and
- Marvin D. Heilman2
Cabbage and sudangrass were used as test crops to determine the effects of management of sorghum residue on N availability and crop yields. Methods of residue management compared were (1) sorghum (green whole plants) turned into soil with disk plow, and (2) sorghum shredded, left on soil surface for several weeks, and then disked into the soil. Uptake of N by subsequent crops was decreased by the latter treatment. Nitrogen recovery by cabbage was 123.2% on the plow-under treatment and only 56.8% on the shredding treatment. The decrease in the available N content of the soil when residues were shredded caused a reduction of 10.1% in the yield of cabbage and 11.1% reduction in the yield of sweet sudangrass.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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