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Organic & Integrated Tree Fruit Production

Friday, December 14, 2018

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3688. Knight, W.E.. 1987. Germplasm resources for legumes in conservation tillage.. IN: J.F. Power (ed.). The role of legumes in conservation tillage systems. p. 13-19.
Brief summary of legume species grown in the region. Mentions a rotation in the Camas Prairie, ID area of 3 yr alfalfa-WW-SB-AWP. Mentions lupin and chickpea as possible crops in the transition area to substitute for fallow. Mentions sweetclover intercropping with spring barley, with barley yields 85% of normal.

4629. Muehlbauer, F.J.. 1983. Legumes in cropping systems in the Pacific Northwest and California. p. B14-18.. Rreport of the Work-Planning Conf. on Legumes in Conservation Tillage Systems..

6228. Siddoway, F.H. and H.C. McKay. 1962. Tillage of sweetclover under dryland conditions.. ID Agr. Ext. Service Bull. #388 Combined Series.
Sweetclover used in 2 systems: spring grain - fallow (limited growing season, precip>14"); winter grain - fallow (precip <14", growing season adequate); 3-8 lb/ac biennial Madrid sweetclover; less weed growth after sweetclover kill than on summerfallow after wheat; sweep tillage worked well in dry years; moldboard plow was the most consistent kill; sweep left about 35% of sweetclover residue on surface; higher soil nitrates after moldboard plow; no signficant effect on soil moisture; yield correlated to soil moisture; yields 16-18 bu/ac; no control plots. T: nitrogen, soil moisture, wheat yield.

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.

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