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Organic & Integrated Tree Fruit Production

Thursday, October 18, 2018

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1360. Cochran, V.L., L.F. Elliott, and R.I. Papendick. 1982. Effect of crop residue management and tillage on water use efficiency and yield of winter wheat.. Agron. J. 74:929-932.

3036. Swan, D.G., M.M. Oveson, and A.P. Appleby. 1974. Chemical and cultural methods for downy brome control and yield of winter wheat.. Agron. J. 49:793-795.

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.

3762. Krauss, H.A. and R.R. Allmaras. 1982. Technology masks the effects of soil erosion on wheat yields - A case study in Whitman County, WA.. IN: Determinants of soil loss tolerance, Am. Soc. Agron./SSSA.
This study seperates yield increases due to technological advances from yield declines due to soil erosion. The average soil productivity decrease from erosion was 10.8 bu/ac. Analysis was carried out by land capability class to reveal different erosion impacts across the landscape. Real yields are increasing on 67% of cropland, and rapidly declined on 18% of croplands. T: yields of wheat in Whitman Co. for each decade since 1936. Winter wheat production and technology inputs in Whitman Co. from 1930-1979. Sheet and rill erosion in Whitman Co. from 1940-1977. Land capability subclasses and their estimated contribution to soil erosion in Whitman Co. Soil erosion and wheat productivity changes as related to soil capability subclasses in Whitman Co. Comparison of current yield distribution with that predicted.

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.

5954. Rosell, R.A., R. Martinez, K. Sommer and R. Miranda. 1982. Relationship of crop rotation and nitrogen availability for wheat in semiarid Argentina.. Plant Nutrition 2:551.
A sequence of small grains, annual natural pasture with grazing and a short (3 months) summer-fall fallowing showed low productivity when compared with a sequence of continuous grain with a long (6 months) fallowing. Wheat yields, number of ears per surface area and total nitrogen uptake were two times higher with long fallowing. Fertilizers are rarely used. Long-term average yields are in the order of 1.2 tons per hectare.

7722. Young, D., A. Chaudhry, and F. Xu. 1987. Price, yield, gross returns, and harvested acres time series for crops in Washington state, Whitman County, and the Columbia Basin.. Agr. Economics Staff Paper AE 87-1.
This is the most recent compilation of crop price and yield data. Most tables report data back to the early 1950's.

8675. Dalal, R.C. and R.J. Mayer. 1986. Long-term trends in fertility of soils under continuous cultivation and cereal cropping in southern Queensland. 1. Overall changes in soil properties. Austr. J. Soil Res. 24:265-279.

9913. Sargent, R.L.. 1987. Wheat Outlook, 1987.. Paper presented at Ag. Outlook Conference, Pasco, WA, Feb. 27, 1987..
This paper was presented at the Agricultural Outlook Conference in Pasco, WA. It discusses the increasing world wide wheat yields and the decreasing trend of world utilization, resulting in continuously rising carryovers. Mr. Sargent projects continued rising yields and is doubtful that any significant action will occur to solve the surplus problem. He feels greater attention should be given to the demand side.

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