WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Wednesday, October 17, 2018

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1396. Cook, F.D., F.G. Warder, and J.L. Doughty. 1957. Relationship of nitrate accumulation to yield response of wheat in some Saskatchewan soils.. Canadian J. Soil Sci. 37:84-88.
Good correlation between wheat yields and soil nitrate levels. Estimated that a significant yield increase from N fertilizers can be expected when the nitrate accumulation value is below 50 ppm N in soil from stubble fields or 40 ppm N in fallowed soils.

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.

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