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Chapter 5,478

Forage dry matter accumulation nutrient composition and in vitro dry matter digestibility of soybean plants

Johnson, J.C.Jr; Monson, W.G.; Marchant, W.H.

Nutrition Reports International 32(1): 231-238

1985


ISSN/ISBN: 0029-6635
Accession: 005477174

Lee 68, GaSoy 17, Bragg, Gatan, and Ottootan soybean plants were first harvested at either 114 or 124 days postseeding, but before major pod filling occurred and at 10 and 20 days thereafter for a total of 3 harvests per cultivar. Dry plant yields for all harvests and cultivars ranged from 7.63 to 11.54 tons per hectare. Dry matter in seed yields of later harvested, fully matured companion plots of Lee 68, GaSoy 17, Bragg, Gatan, and Otootan amounted to 35.0, 32.7, 31.0, 28.3, and 23.4% of the maximum amount of forage dry matter obtained at any previous harvest. Cultivars were different for ether extract and crude protein content of forage which increased with each harvest; however, rates of increase tended to be similar for all cultivars. Cultivars were different for neutral detergent fiber, acid detergent fiber, and acid detergent lignin content of forage which declined with successive harvests, but rates of decline were not the same for all cultivars. Increases in ether extract and crude protein and decreases in fiber components with delay of harvest were associated with a corresponding increase in in vitro digestible dry matter content, but rates of increases were not alike for all cultivars. Harvesting of soybeans when pods were well filled, but before heavy leaf drops occurred, seemed to be the best procedure for optimizing both quantity and quality of yield of cattle feedstuff nutrients from soybean forage.

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