WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Sunday, June 24, 2018

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Search results on 06/24/18

5539. Ramig, R.E.. 1987. Conservation tillage systems for green pea production in the Pacific Northwest.. IN: J.F. Power (ed.). The role of legumes in conservation tillage systems. p. 93-94.
Summarizes a 13 yr study of the effects of 4 tillage systems in a pea-winter wheat cropping system on water conservation and use, yields, water use efficiency, and the changes in weed populations. Water storage on land on which wheat stubble was left standing overwinter averaged 10% more than on fall-tilled stubble. There were no significant differences in wheat yields among tillage systems. Weed infestations in peas shifted due to tillage, primarily with lambsquarters. Spring plow was worst. Conservation tillage for a wheat-pea rotation can enhance water conservation, and in dry years can increase pea yields by 20% and wheat yields by 5%. Long-term effects are not consistent due to crop residue influences.

6620. Speilman, R.S.. 1984. Nitrogen economy and agronomic evaluation of annual legume-cereal grain rotations.. M.S. Thesis, Plant and Soil Science, Montana State Univ., Bozeman, MT.
Legume biomass and seed yield were best for fababean, fieldpea, and chickpea. Potential for use of legumes for hay or silage. Barley yield after legumes was comparable to barley after fallow, and better than barley after barley or wheat. N contributions to the cropping system, except for field bean, were greater for legumes than for fallow. High N fertility levels from legume N plus fertilizer N resulted in premature soil moisture depletion. Optimum rotation performance will depend on balancing nitrogen fertility with expected available moisture.

7850. Koala, S.. 1982. Adaptation of Australian ley farming to Montana dryland cereal production.. M.S. Thesis, Dept. of Plant and Soil Sci., Montana St. Univ., Bozeman, MT 59717.
This study examined the potential to adapt the ley farming system used in Australia to dryland cereal production in Montana. The ley system alternates a grain crop with a self-seeding forage legume. The legumes tested in this study included 5 Australian medics, 7 subclovers, 2 lupins, fababean, and a native Montana black medic. One full cycle of the system was completed. All grain yields (spring wheat) were higher after the legumes than after fallow. Soil water to 120 cm was similar in all plots at wheat planting. The black medic treatment had the highest water use efficiency (100 kg grain/cm) and fallow the lowest (55 kg grain/cm). There were higher levels of soil nitrate after the legumes than after fallow. Re-establishment of the legumes after wheat ranged from 3 to 93% ground cover, with black medic being the highest. Overall, black medic from Montana performed best in this study.

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