Browse on keywords: legume crop rotation tillage
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5362. Power, J.F. (ed.). 1987. The role of legumes in conservation tillage systems.. Soil Cons. Soc. Amer., Ankeny, IA. 153 pp..
Proceedings of a national conference, University of Georgia, Athens, April 27-29, 1987. Excellent reference for the use of legumes in cropping systems and their compatibility with conservation tillage. Major sections include: the need; germplasm resources; nitrogen source; insects and diseases; cropping practices; weed control; erosion and productivity; economics.
4798. Nelson, A.L.. 1930. Methods of spring wheat tillage.. WY Agr. Expt. Sta. Bulletin 173.
No spring wheat yield benefit was realized from having winter rye or peas as green manure in the rotation over 17 years. Some years it was observed that the green manure had not begun to decay a year after plowdown. For the first five years of the study, the pea green manure in rotation was superior to fallow preceding spring wheat. A 3-year rotation study found spring wheat to yield 23% more following dry beans compared to corn.
7242. Veseth, R.. 1989. Reduced tillage for green manure legumes. STEEP Conservation Farming Update, Summer 1989, p. 3-5.
Three tillages were compared for incorporating Austrian winter pea or red clover green manure: moldboard plow plus shallow disk; shallow disk twice; no-till. At each N fertilizer rate, winter wheat yields were slightly higher with reduced tillage than with conventional tillage. A 60 lb/ac N rate substantially increased wheat yields after green manure, while the 120 N rate gave little or no yield increase. With no N fertilizer, the yield of winter wheat after both green manure crops compared favorably with yield of no-till winter wheat after a seed crop of spring peas. Legume N uptake by a following wheat crop was not affected by residue treatment, but recovery of legume N from the soil was about 10% lower with surface application than with soil incorporation. Also, wheat yields after chemically-killed green manures were consistently lower, and could not be fully recovered with fertilizer N. The mechanism of this suppression is not known.