Browse on keywords: crop rotation green manure fallow replacement
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7930. Sims, J.R.. 1988. Research on dryland legume-cereal rotations in Montana.. Symposium on Crop Diversification in Sustainable Agriculture. Univ. of Saskatchewan, Saskatoon.
This paper opens with a review of the long-term findings of historic rotation studies for dry farming in Montana and concludes that improved varieties and management abilities call for a re-examination of alternatives to the crop-fallow system. A short description of ley farming in Australia follows, and then research on adapting it to Montana conditions is presented. Results to date indicate the potential for both grain and forage legumes to successfully precede a cereal crop without significant cereal yield losses, and with a reduced need for nitrogen fertilizer. T: medic soil water use and N contribution; wheat yields after medics; pulse and cereal grain yields; annual legume forage yields; fertilizer response curves for barley with various forecrops.
10297. Sims, J.. 1992. Project report, low-input legume/cereal rotations for the Northern Great Plains-Intermountain region.. Dept. of Plant and Soil Sci., Montana State Univ., Bozeman, MT 59717.
Two cycles of the Indianhead lentil green manure/wheat rotation have been completed, using controlled water use management. Wheat yields were greater for the intermediate water use at all sites when compared to all other treatments and both controls. Water use efficiency for legumes was as follows: winter pea > black medic > Cahaba white vetch = sweetclover > Indianhead lentil. Winter peas appear to be more efficient N producers than the lentil. N was apparently still being released from a 1988 plowdown when measured after another 1990 plowdown. Of 19 annual legumes, only Robinson snail medic produced wheat yields superior to fallow and equal to fallow plus 80N. Winter wheat yields from the 1990 large-seeded legume plots were all greater than yields after fallow and slightly less than fallow plus 40N. In on-farm demonstrations with legumes, malting barley quality factors were enhanced by a green manure crop.