WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Sunday, June 24, 2018


Browse on keywords: tillage sweetclover

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Search results on 06/24/18

2211. Goldstein, Walter. 1989. Thoughts on drought-proofing your farm: a biodynamic approach. Working paper No. 2, Michael Fields Agr. Institute.
Describes the influence of soil aggregate size on moisture retention and crop growth. Discusses the benefits of perennial grasses in the rotation to improve soil structure. Discusses management of sweetclover for grazing and green manure. Discusses stubble mulch tillage.

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.

7434. Walter, D.T.. 1987. Early studies on the use of legumes for conservation tillage in Nebraska.. IN: J.F. Power (ed.). The role of legumes in conservation tillage systems. p. 9-10.
Describes early research beginning in the 1930s. Surface residues, especially alfalfa, improved soil structure and infiltration. Erosion and runoff from dense, subtilled legume plots was minimal compared to oat or wheat stubble. Sweetclover and alfalfa were the principal legumes. Erosion and excess N mineralization were problems with sweetclover. Subtilling legume residues retarded decomposition and nitrification, increased earthworm casts, and enhanced aggregate stability. When sweetclover decomposed on the surface, 5-10 lb N/ac were lost as NH3, with only a trace lost when residue was plowed under.

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