Browse on keywords: crop rotation no-till
Search results on 05/24/13
2756. Huggins, D.R., W.L. Pan, and J.L. Smith. 1989. Improving yield, percent protein, and N use efficiency of no-till hard red spring wheat through crop rotation and fall N fertilization.. Proceedings, 40th Far West Fertilizer Conference,.
In a field experiment near Pullman, WA, all fall and split fall-spring N applications significantly increased percent protein and N uptake efficiency as compared to all spring applications, while yields were unaffected. Protein increase was attributed to enhanced late season uptake, due to better positional availability of deep soil N. In another experiment, yield of hard red spring wheat was 10% greater when no-tilled into Austrian winter pea stubble (for seed) as compared to winter wheat stubble, while grain N and percent protein were not affected. The difference in yield was not eliminated by optimized N rates, indicating other rotation effects.
3098. Swanson, Guy. 1990. Annual production of spring wheat in Montana and the Columbia Basin. Bumper Times special edition, Jan. 31, 1990; p. 6; S. 4305 University Rd., Spokane, WA 99206.
Minimum till continuous spring wheat produced the highest net returns in a Montana study. The cost of Roundup reduced net returns in no-till, although no-till had the highest gross returns. John Rae, a WA farmer, has compared continuous no-till spring wheat with his normal winter wheat-fallow system. The continuous system has produced $350/ac more gross returns over five years in his 9" rainfall area.
3107. Dormaar, J.F. and C.W. Lindwall. 1989. Chemical differences in dark brown chernozemic Ap horizons under various conservation tillage systems.. Can. J. Soil Sci. 69:481-488.
Soil properties were investigated in two long-term studies: a 19 yr study of till vs. no-till in wheat fallow, and a 9 yr study of till vs. no-till with 3 rotations, including continuous cropping. No-till had the predominant influence on improving various soil physical and microbial properties. There was little difference in continuous cropping versus wheat-fallow, with tillage. The study compared soil from the entire plow depth, and concluded that 19 yr was long enough for the entire Ap horizon to benefit from no-till. No-till in both studies led to 40% of the dry aggregates being >0.84 mm. Dehydrogenase and phosphatase activities were twice as high under no-till as under cultivatiion. No-till also led to the largest monosaccharide accumulation in the soil.
8384. Beus, C., D. Dillman, and J. Carlson. 1990. Palouse agriculture: a survey on production practices, policies, and problems.. unpublished results, Dept. of Rural Sociology, Washington St. Univ., Pullman, WA 99164.
This random survey was done in the Palouse area of eastern WA and northern ID, with a random sample of about 260 farmers. Average farm size was 1392 acres. One-third of the respondents would like to change their current rotation, primarily to reduce disease problems, but consider government programs to be the biggest barrier. Desire to use no-till planting was evenly split. Half the respondents felt they were using most of the available erosion control practices. Large percentages (>60%) felt that contour tillage, surface roughness, no-till, good plant cover, and tilth were very important erosion control factors. Herbicide and fertilizer use trends over the past five years were normally distributed. Use of fungicides on wheat (other than seed treatment) was generally less than 20%. Half the farmers currently use soil testing, and of those, 90% tested for residual N to 4-5 ft. depth. Half the respondents felt they had cut back on pesticide and fertilizer use since their high point, while only 10-20% felt they would do so in the future. About 65% had heard of the LISA program, and 26% indicated opposition to it.
8559. Hammel, J.E.. 1989. Long-term tillage and crop rotation effects on bulk density and soil impedance in northern Idaho.. Soil Sci. Soc. Amer. J. 53:1515-1519.
Bulk density and soil impedance (measured with a penetrometer) were studied on a set of tillage x rotation plots after 10 yr of treatments. Tillage had a significant effect on bulk density, but not on soil impedance. Crop rotation did not significantly influence either property. There were differences with depth. Minimum and no-till soil impedance was greater than conventional till in the surface 5-15 cm. Higher impedance values under reduced tillage, while not preventing root growth, may limit root function when combined with typical cool, wet spring soils, and thus decrease crop growth potential.
10496. Wood, C.W., G.A. Peterson, D.G. Westfall, C.V. Cole, and W.O. Willis. 1991. Nitrogen balance and biomass production of newly established no-till dryland agroecosystems.. Agron. J. 83:519-526.
Three cropping systems were compared under no-till management: wheat-fallow, wheat-corn-millet-fallow, and perennial grass. The four-year crop rotation had greater aboveground production, greater N uptake, and greater residue retention that wheat-fallow. Continous grass had less aboveground production and N uptake but greater residue retention than the cropped systems. The four-year rotation had lower potential for N leaching than wheat-fallow, and greater potential for replenishment of soil organic N.
11037. Anon.. 1990. Annual production of spring wheat in Montana and the Columbia Basin.. Bumper Times Special Report, Spokane, WA. 1/31/90, p. 6..
In Montana, annual minimum till spring wheat produced the highest net returns compared to other summer fallow and winter wheat/spring wheat rotations. No-till continuous wheat produced the highest gross returns, but chemical costs reduced net returns. A farmer near Walla Walla, WA, had compared annual spring wheat to winter wheat-fallow. The annual system grossed $350/ac more than the crop-fallow system over five years. In the annual system, fields are swept after harvest and rodweeded in the fall to avoid the "green bridge." Fields are sprayed with Roundup and seeded to spring wheat as early as possible using a no-till drill. This often is in February. Average rainfall is 9".
11308. Coutts, G.R. and R.K. Smith. 1991. Zero Tillage Production Manual.. Manitoba-North Dakota Zero Tillage Farmers Association, Brandon, Manitoba.
The manual contains a mix of research results and grower experience with no-till management in the Northern Plains. A calendar of operations is included. In a four-year Manitoba study, average net returns per acre for no-till and minimum till were 130% and 77% higher, respectively, compared to conventional tillage.