WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Thursday, January 18, 2018

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1475. Crea, M.. 1978. Idaho agricultural commodity statistics. Historical series 1900-1976.. ID Agr. Expt. Sta. Misc. Series #43.

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.

4827. Nelson, E.. 1908. Dry farming in Idaho. ID Agr. Expt. Sta. Bull. #62.
Caldwell, ID - better sites yield 30-40 bu/ac wheat, even 60; alfalfa - several cuttings; drier sites yield 20-30 bu/ac; in Utah, 1" of rain stored in soil produces 2.5 bu wheat; summerfallow necessary; eastern WA - late spring plowing with early disking and harrowing is effective weed control; "slicker" - homemade tool in Columbia Basin to kill weeds; Subsurface packer - after plowing, increased yields in Columbia Basin 25%. Idaho soils - short on N and humus; alternate crop possibilities: milo, sorghum, field peas, alfalfa, grass; also spring emer (speltz), hulled wheat (adapted to arid conditions); WW vs. SW has 4-5 bu/ac yield advantage.

5423. Pubols, B.H. and C.P. Heisig. 1937. Historical and geographic aspects of wheat yields in Washington.. WA Agr. Expt. Sta. Bull. #355.
This report shows the low-to-high yielding regions within the state. It presents trends in yields from 1879 to 1937; and seperate data for spring vs. winter wheat from 1900-37. Graphs clearly show that the proportions of winter and spring wheat depend upon moisture conditions in the fall. For the 58 year period the weighted average yield was 19 bu/ac. The trend in yield during this period was horizontal. "Average yields were maintained by improved farming methods and superior varieties of wheat, even though soil resources were deteriorating. The critical status of the soil resources and their rapid decline suggest that effective soil and moisture conservation methods must be adopted in order to maintain yields." T: All wheat acres harvested, production and yield/acre 1879-1937. Wheat yield zones of south eastern WA. Distribution of wheat acreage, production, yield, 1929-32.

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