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Saturday, December 15, 2018

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Search results on 12/15/18

602. Badaruddin, M., and D.W. Meyer. 1989. Forage legume effects on soil nitrogen and grain yield, and nitrogen nutrition of wheat.. Agron. J. 81:419-424.
Five forage legumes (annual alfalfa, perennial alfalfa, sweetclover, red clover, and hariy vetch) were evaluated as possible replacements for summerfallow in the northern Great Plains. Hard red spring wheat was grown after all plowdowns, and after wheat, and a fallow check. Legume species were not significantly different in hay yields, and root and crown N content across environments, although alfalfa and sweetclover had 35-83% greater N contents than other species. Soil nitrate N in the spring following legumes was greater than following fertilized wheat, but less than following fallow across environments. Grain yield and N uptake of wheat following forage legumes generally were equal to those following fallow, but greater than those following wheat. These results suggest that including 1-yr forage legumes in crop sequence would be a better option than fallow in the higher moisture areas. T: N content of forage leguems; wheat yields as influenced by previous crop; N efficiency

826. Bezdicek, D. and R. Lockerman. no date. Crop rotation and the response of cereal crops to nitrogen in the PNW. unpublished.
Experiments conducted at Pullman, WA and Bozeman, MT. Year 1 - legumes (rainfall -Pullman 500 mm, Bozeman 480 mm). Year 2 -Pullman winter wheat + N (rainfall 350 mm); Bozeman barley + N (rainfall 200 mm). Compared fababean, pea, lentil, chickpea, fallow at both locations. Pullman legumes were used as green manure, Bozeman legumes were harvested for seed. N fertilizer equivalents ranged from 30-86 kg/ha N at Pullman (fallow = 125) and from 27-81 kg/ha N at Bozeman (fallow = 53). All cereals responded to added N, although less so at Pullman. More N was removed in seed than was fixed. Seed legumes appeared to fix 50-100 kg/ha N. The rotation effect was more significant at Pullman. T: cereal yields; fertilizer N equivalent; moisture depletion.

3816. Ladd, J., J. Oades, and M. Amato. 1981. Distribution and recovery of nitrogen from legume residues decomposing in soils sown to wheat in the field.. Soil Biol. Biochem. 13:251-256.

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