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Search results on 12/13/13
2617. Hill, K.W.. 1954. Wheat yields and soil fertility on the Canadian prairies after a half century of farming.. Soil Sci. Soc. Am. Proc. 18:182-184.
T: soil properties X rotation; wheat yields X time
3070. Tanaka, D.L. and J.K. Aase. 1989. Influence of topsoil removal and fertilizer application on spring wheat yields.. Soil Sci. Soc. Am. J. 53:228-232.
In 3 of 5 years, soil removal treatments reduced spring wheat yields an average of 9, 28, and 45% for 0.06, 0.12, and 0.18 m soil removal treatments, respectively, over all fertilizer treatments. The data suggest that P was the most limiting nutrient and additions of N fertilizer without P resulted in small yield increases.
3471. Kaiser, V.G.. 1962. A lesson in farming from an old agriculture.. V. Kaiser papers, box 1, folder 80.
Describes wheat fallow fields in Turkey and Iran farmed over 3000 years; low yields (6-7 bu/ac), no inputs, no erosion - stable system; intensified production can cause massive problems and requires better soil conservation and organic matter management.
3885. Leggett, G.E., H.M. Reisenauer and W.L. Nelson. 1959. Fertilization of dryland wheat in eastern Washington.. WA Agr. Expt. Sta. Bull. #602.
This bulletin presents the results of 5 yrs of experimenting with the fertilization of wheat. During 1953-1957, 112 fertility experiments were conducted on dry land wheat throughout eastern Washington. Nitrogen fertilization significantly increased yields in 92 of the 112 experiments conducted. Whether nitrogen fertilization increased wheat yields depended largely on the amount of moisture available to the crop. Because of the decline in soil organic matter through years of cropping, the amount of available N released by soils is no longer adequate to support high wheat yields. The introduction of high yield varieties and improved tillage has increased yield potential, and this has increased the demand for N. Application rates (lb N/ac): <10" rainfall - 20-40; 10-15" - 20-60; >15" - 30-80. Different types of N fertilizer did not change yields. T: Summary of the effects of N on wheat yields, 1953-57; effect of N on yield from fallow ground.
5197. Peterson, P.P.. 1918. Soils of Latah County, Idaho.. ID Agr. Expt. Sta. Bull. #107.
Notes the great power of the soil to absorb falling rain; little cropping before 1870; native bunchgrass provided good spring pasture for cattle; history - 1887 first railroad to Genesee; very profitable line; wheat yields run as high as 70 bu/ac, seldom less than 20 bu/ac; 2 yr grain, then fallow for weed control; some interest in livestock; large farms 320-1200 ac; average 140 ac; field peas profitable in 1918; clover an option; response to S in alfalfa (gypsum 50-100 lb/ac). Low CacO3 in soil; low pH a future problem?