WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Thursday, January 18, 2018

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231. Allmaras, R.R., C.L. Douglas and K. Ward. 1976. More infiltration, less runoff and evaporation.. OR Agr. Expt. Sta. Special Report 459.

2274. Greenland, D.J.. 1977. Soil structure and erosion hazard.. Soil Conserv. and Management in the Humid Tropics..
The structure of surface soil is usually given most attention in relation to soil erosion, because it is most subject to deterioration under raindrop impact, and due to agricultural practices its contition can be readily altered. However, subsoil structure is also important, as infiltration in a water-saturated profile is determined by the horizon of lowest conductivity.

5273. Pikul, J.L., J.F. Zuzel and D.E. Wilkins. 1988. Measurement of tillage-induced soil macroporosity.. Amer. Soc. Agric. Engr., Paper No. 88-1641.
An improved method to impregnate soil with paraffin was used to study tillage induced macroporosity. Macroporocity and water infiltration measurements, conducted in March, attest to the overwinter stability of macropore structure on both the chisel and Praplow tillage treatments. Water infiltration was least on the no-tillage treatment.

5751. Redinger, G.J., G.S. Campbell, K.E. Saxton, and R.I. Papendick. 1984. Infiltration rate of slot mulches: measurement and numerical simulation.. Soil Sci. Soc. Am. J. 48:982-986.

7672. Wysocki, D.. 1989. Improving water infiltration in frozen soil.. STEEP Conservation Farming Update, Summer 1989, p.13-14..
Compared fall chisel versus standing stubble for water infiltration at 3 dates. No difference in July following harvest, much lower infiltration with stubble in December with 5" frost depth, no difference (low infiltration) in January with 14" frost depth. For chisel tillage to be effective, chisel marks must be open to the surface, and chisel fracturing should penetrate below the frost depth. Deeper chiseling at wider spacing, or subsoiling, may be an option.

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