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Sunday, April 22, 2018

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1729. Douglas, C.L., R.R. Allmaras and N.C. Roager. 1984. Silicic acid and oxidizable carbon movement in a Walla Walla silt loam.. Soil Sci. Soc. Amer. J. 48:156-162.
Leachate concentrations and net transfers of silicic acid decreased as long term C additions and soil pH increased; liming reversed this; results in adverse physical properties below the plow layer - decreased hydraulic conductivity, increased cementation.

1639. Dormaar, J.F., C.W. Lindwall, and G.C. Kozub. 1988. Effectiveness of manure and commercial fertilizer in restoring productivity of an artificially eroded dark brown chernozemic soil under dryland condit. Can. J. Soil Sci. 68:669-679.

1987. Fireman, M.. 1945. Effect of sodium nitrate and ammonium fertilizers on the permeability of western soils.. .
Experiments on 51 western soils. Sodium nitrate reduced permeability 41-86%. Ammonium nitrate and ammonium sulfate also decreased permeability, but to a lesser extent. T; Permeability tests; variations in permeability.

3210. Bhatti, A.U.. 1990. Spatial variability and geostatistical estimation of soil properties and wheat yield on eroded lands in the Palouse region.. Chpt. 3, PhD. Dissertation, Dept. of Agronomy & Soils, Washington State Univ., Pullman, WA 99164.
Spatial variability of organic matter, soil P, and wheat yields was studied using classical statistical and geostatistical approaches on two commercial wheat farms in the Palouse region of eastern Washington. Geostatistics indicated strong spatial relationship of soil properties and wheat yields with a range of influence of 50-200 m. The two sites differed greatly in spatial patterns due primarily to differences in topography and the extent of erosion and topsoil loss. As a consequence of topsoil loss and reductions in organic matter, it was demonstrated that spatial patterns in yield and soil phosphorus were strongly correlated with organic matter patterns. Remote sensing of soil organic matter and the use of geostatistics offers a way to quickly assess spatial patterns in grain yield and available phosphorus.

3220. Bhatti, A.U.. 1990. A comparison of criteria for dividing eroded wheat fields into different management zones.. Chpt. 2 PhD. Dissertation, Dept. of Agronomy & Soils, Washington State univ., Pullman, WA 99164.
The study examined possible criteria for dividing dryland grain fields into management units for variable fertilizer (and other input) management. Criteria evaluated included fertility status, organic matter content, available water content, soil pH, erosion class, and wheat yield. Erosion class and soil pH were not satisfactory, but the other criteria were acceptable since they all allowed division of the field into three zones with significantly different grain yields as well as different nitrogen fertilizer rates (ranging from 0 to 90 kg N/ha). For each criterion, the field-averaged rates of recommended N were about 35 kg/ha, which is much lower than the grower's typical uniform application of 73 kg N/ha. Generally, the lowest N rates were recommended for eroded hilltops where productivity was low. The two best criteria appeared to be soil organic matter content and grain yield, as they accounted for P deficiency in the eroded zones. Remote sensing can now assess spatial patterns of organic matter on bare soil, thus providing a quick and easy way to delineate production zones.

6489. Smith, H.W., S.C. Vandecaveye and L.T. Kardos.. 1946. Wheat production and properties of Palouse silt loam as affected by organic residues and fertilizers.. WA Agr. Expt. Sta. Bull. #476.
Examined soil properties from 2 plots at the WSC farm. T: Effects of treatments on nitrogen content of grain and straw. Effects of treatments in C and N changes in soil. Effects of treatments on aggregation and % saturation by sodium. Yields of wheat under annual cropping as affected by organic residue and N fertilizer, 1922-1945. Yields of wheat under wheat/fallow as affected by organic residue and N fertilizer, 1922-1945.

8682. Elson, J.. 1941. A comparison of the effects of fertilizer and manure, organic matter, and carbon-nitrogen ratio on water-stable soil aggregates.. Soil Sci. Soc. Amer. Proc..

10386. Stone, L.R., R. Ellis Jr., and D.A. Whitney. 1982. The effects of nitrogen fertilizer on soil.. Bulletin C-625, Cooperative Extension, Kansas State Univ., Manhattan.
Ten years of field plot testing were conducted to determine the influence of nitrogen fertilizer source on soil physical and chemical properties. The zero N check had the highest saturated hdraulic conductivity (not significant). There were no differences in bulk density, compactibility, or penetration resistance. Extractable Zn was significanctly less in fertilizer treatments compared to the check, while extractable Mn was greater with fertilizer. Fertilizer did significantly lower soil pH at both depths. There were no differences due to fertilizer source (anhydrous, ammonium nitrate, urea, UAN).

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