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This article in SSSAJ

  1. Vol. 61 No. 1, p. 246-253
     
    Received: Nov 27, 1995
    Published: Jan, 1997


    * Corresponding author(s): wreeves@acesag.auburn.edu
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doi:10.2136/sssaj1997.03615995006100010034x

Suitability of Sunn Hemp as an Alternative Late-Summer Legume Cover Crop

  1. Zulfadli Mansoer,
  2. D. Wayne Reeves  and
  3. C. Wesley Wood
  1. Kantor Wilayah Department Pertanian Propinsi Jambi, JLN. Jend. A. Thalib, Jambi, 36129, Indonesia
    USDA-ARS National Soil Dynamics Lab., P.O. Box 3439, Auburn, AL 36831-3439
    Dep. of Agronomy and Soils, Auburn Univ., Auburn, AL 36849-5412

Abstract

Abstract

The tropical legume ‘Tropic Sun’ sunn hemp (Crotalaria juncea L.) may have potential as an alternative legume cover crop or as forage for cattle in southern temperate regions. This study determined dry-matter production, chemical composition, and N release from sunn hemp residue under conventional and no-tillage systems as might be used in corn (Zea mays L.) production. Sunn hemp was sown in mid-August and mowed in early December on a Norfolk sandy loam (fine-loamy, siliceous, thermic Typic Kandiudult) and a Lucedale fine sandy loam (fine-loamy, siliceous, thermic Rhodic Paleudult) in Alabama (1991–1992). Mesh bags were used to determine residue decomposition and N release. Average dry-matter production was 5.9 Mg ha−1 9 to 12 wk after planting. At mowing, residue N content averaged 126 kg ha−1. Residue overwintered on the soil surface until early April. During the first 4 wk following mowing, N release from residue was 50%. In April, N remaining in overwintered residue was only 38% of that after mowing in December (45 kg N ha−1). Nitrogen release from residue during the subsequent corn growing season was 13% in no-tillage and 43% in conventional tillage. Sunn hemp produced sufficient dry matter to cover and protect the soil from erosion and provided sufficient N to benefit a succeeding summer crop. In addition, forage quality of leaves was suitable to provide late summer and fall grazing. Sunn hemp has potential to be managed as an alternative to winter legume cover crops in warm temperate regions.

Contribution of USDA-ARS and Alabama Agric. Exp. Stn.

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