WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Monday, July 23, 2018

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Search results on 07/23/18

555. Auld, D.L., G.A. Murray, and R.V. Withers. 1983. Austrian winter peas: a green manure crop for Idaho.. ID Agr. Expt. Sta. CIS #652.
Good % of pea N is from soil; best to plow under right after flowering; Melrose contributed 278 lb/ac of vine N; winter peas produced slightly more biomass than spring peas, but fall peas can be plowed 2 weeks earlier; spring peas accumulated 70 lb N/ac more than winter peas; variable cost of WW-SB-SF = $63/ac, uses 120 lb N/ac; for WW-SB-pea GM = $59/ac, with only 40 lb N/ac; must consider intangible benifits; recommended green manure crop every 3-5 years. T: organic matter yield, nitrogen content, costs.

3955. Mahler, R.L. and D.L. Auld. 1989. Evaluation of the green manure potential of Austrian winter peas in northern Idaho.. Agron. J. 81:258-264.
Austrian winter peas were evaluated as a green manure (GM) or seed pea (SP) crop, along with soil N levels, and subsequent yields of winter wheat (WW) and spring barley (SB). Four rotations were tested: GM-WW-SB; SP-WW-SB; SB-WW-SP; SF-WW-SB. Average N fertilizer equivalent values of 94, 75, and 68 kg/ha were provided by GM, SP, and SF (fallow) respectively, to the following wheat crop. Yield differences due to crop rotation or N fertilization rate were not observed in the third year of the cropping sequence. Austrian winter peas used as either a GM or SP provided more inorganic N than SF or SB. Although cereal crop yields were comparable, the SP-WW-SB was more profitable than GM-WW-SB or SF-WW-SB, due to the extra harvested crop.

9952. Zahradnik, F.. 1983. He nets $60,000 a year without buying fertilizer.. The New Farm, March/Apr 1983, p.22-24..
Don Lambert of Cheney, Washington, has not had any synthetic fertilizers used on his 780-acre farm since his family began farming it three generations ago. Yet the farm consistently produces 65 to 70 bushels of winter and spring wheat per acre. His farm also has up to four times less rill erosion than neighboring fields. Lambert's independence from fertilizer and the reduced erosion are due the use of Austrian winter pea as a green manure every third year in his rotation. He plants this cover crop in April and lets it grow until late July or early August. If spring wheat is to follow, he plows just enough to leave a heavy surface residue to protect against winter erosion. A soil test following Austrian winter pea showed enough nitrogen for 84 bushels of wheat per acre. The cover crop builds organic matter content of the soil, helps control weeds, and researchers believe it somehow unlocks phosphorus from the soil, making it more available to following crops.

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