Browse on keywords: legume WA nitrogen equivalent
Search results on 09/22/18
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 unpublished.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.
3589. Kirby, E.M.. 1987. Soil moisture depletion and wheat yield response from annual legumes in the Pacific Northwest. M.S. Thesis, Dept. of Agronomy and Soils, WSU, Pullman, WA.
Legumes included chickpea, spring pea, lentil, fababean, sweetclover, rose clover, black medic, barrel medic. Sweetclover depleted more soil moisture than other legumes. Wheat yield increased following legumes relative to that after barley. Highest yield followed legume green manure with additional fertilizer N. Grain yields were similar for fallow, lentil, pea, chickpea, and fababean. T: soil moisture depletion; yield, N content of soil and grain.
8578. Pannkuk, Chris. n.d.. Estimating N credits for no-till wheat.. unpublished report, Land Management unit, USDA-ARS, Pullman, WA 99164.
N contributions from tinga pea (hayed or green manure) and black medic (green manure) of 70, 54, and 59 lb N/ac, respectively, were made on a subsequent spring wheat crop. All crops were planted no-till. Poor wheat stand establishment after the green manure tinga pea may have caused the low apparent contribution. Three nitrogen rates of 0, 50, and 100 lb N/ac were used. Wheat yields after legume at zero N were about twice as high as in continuous wheat, but the 100 N rate brought the latter yields up to par with the wheat after legume.