WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Saturday, January 20, 2018

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Search results on 01/20/18

1292. Chaudhary, T.H.. 1976. The effect of nitrogen source and 2-chloro-6-(trichloromethyl) pyridine (N-Serve) on the nitrogen and sulfur nutrition of wheat.. Ph.D. Thesis, Dept. of Agronomy and Soils, Washington State Univ., Pullman, WA.
The effects of urea applications with and without the product N-serve were examined. N-serve considerably reduced the loss of NH4+-N to organic transformations, and resulted in much higher amounts that were available to plants. Some problem of N toxicity resulted, but this was presumed to also be related to a lack of sulfur. T: Many. e.g.:Changes in the organic N content of the soil and N uptake by plants. Amounts of NH4+-N and NO3--N in the soil in April and August. Dry-matter yields and percentage uptake of N and S.

4766. Murray, T.J.. 1921. The effects of straw on the biological soil processes.. Soil Sci. 12(3):233-259.
Experiments are conducted to describe microbial processes. The addition of straw to soil has a harmful effect on nitrate accumulation. Nitrate being lost is transformed to organic N. The process of ammonification is inhibited above 0.9% straw content of soil. Straw is a source of energy for N fixing bacteria. Straw does not effect the biodiversity of microbe populations. Straw stimulates bacteria reproduction. Nitrates from straw are transformed to organic N and are not available to plants. The intensity of the reaction depends on the amount of the straw. T: many, eg.: Effects of straw on nitrogen fixation. Number of bacteria in soils variously treated. Bacteria in various straw treatments.

6479. Smith, H.W. and S.C. Vandecaveye. 1946. Productivity and organic matter levels of Palouse silt loam as affected by organic residues and nitrogen fertilizers.. Soil Science 62:283-291.
Considers changes to soil over 23 yrs, 1921-1944, and summarizes yield data. T: Soil treatment and crop yields. N content and effect of treatment. C content and effect of treatment.

7231. Veseth, R.. 1987. Variable fertilizer application improves profits and conservation.. STEEP Conservation Farming Update, Spring 1989, p. 7.
This is a report on work being undertaken by Dr. David Malla, of WSU. Mulla proposes that soil, water and fertilizer resources can be used most efficiently with a variable fertilizer management strategy matched to spatially variable crop yield potentials within the field. Extensive testing was done at two sites. Mean yields with variable fertilizer were slightly greater than those with the uniform rates. However, significantly lower fertilizer inputs were used with the variable rates, costing $14 less per acre. The work shows that potential yields are related to landscape position. T:Graphs of available soil water, estimated winter wheat yield, phosphorus, nitrogen, and organic matter are shown in relation to topographic position across a sharply rolling field.

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