WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Friday, October 19, 2018

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Search results on 10/19/18

3348. Jaffri, M.Z.. 1956. Effect of farming systems on soil losses, organic matter changes, and trends in productivity of land in the Palouse wheat-pea area.. M.S. Thesis, Washington State College, Pullman, WA.
An excellent study to determine the effect of cropping systems, tillage practices, fertilizers, and conservation practices on soil loss and soil organic matter changes, and to future soil productivity. T: many.

5030. Papendick, R.I.. 1984. Soil conservation and management in the Palouse. p. 234-244.. IN: B.R. Bertramson (ed.). History of the Dept. of Agronomy and Soils, WSU, Pullman, WA.
An historical overview.

5771. Reganold, J.P., L.F. Elliott and Y.L. Unger. 1987. Long-term effects of organic and conventional farming on soil erosion.. Nature, 330(26 Nov.):370-372.
The long-term effects (since 1948) of organic and conventional farming on selected properties of the same soil are compared. The organically-farmed soil had significantly higher organic matter content, thicker topsoil depth, higher polysaccharide content, lower modulus of rupture and less soil erosion than the conventionally-farmed soil. This study indicates that, in the long term, the organic farming system was more effective than the conventional farming system in reducing soil erosion and, therefore, in maintaining soil productivity. T: Mean values of conventional and organic farm soil properties.

5761. Reganold, J.P.. 1988. Comparison of soil properties as influenced by organic and conventional farming systems.. Am. J. Alt. Agric., 3(4):144-155.
This paper summarizes data from previous and current studies on two adjacent farms, one organically managed and the other conventionally managed, in the Palouse region of eastern Washington. The 320-hectare organic farm has been managed without the use of commercial fertilizers and only limited use of pesticides since the farm was first plowed in 1909. The 525-hectare conventional farm, first cultivated in 1908, began receiving recommended rates of commercial fertilizers and pesticides in 1948 and the early 1950's, respectively. The organically-farmed Naff silt loam soil had significantly higher organic matter, cation exchange capacity, total nitrogen, extractable potassium, water content, pH, polysaccharide content, enzyme levels, and microbial biomass than did the conventionally-farmed Naff soil. Also, the organically-farmed soil had significantly lower modulus of rupture, more granular structure, less hard and more friable consistence, and 16 centimeters more topsoil. This topsoil difference between farms was attributed to significantly greater erosion on the conventionally-farmed soil between 1948 and 1985. The difference in erosion rates between farms was most probably due to their different crop rotation systems; i.e., only the organic farm included a green manure crop in its rotation, and it had different tillage practices. These studies indicate that, in the long-term, the organic farming system was more effective than the conventional farming system in maintaining the tilth and productivity of the Naff soil and in reducing its loss to erosion.

5899. Rodman, A.W.. 1988. The effect of slope position, aspect, and cultivation on organic carbon distribution in the Palouse.. MS Thesis, Dept. of Agronomy & Soils, WSU, Pullman, WA.
Soil organic carbon (OC) was studied at 4 sites, native and cultivated. At the native site aspect had the greatest influence on OC levels. At the cultivated site OC distribution is due to water and tillage erosion. All topsoil had been eroded from south slopes. Perennial grass rotations had added OC above and below the surface while reducing OC loss from erosion and oxidation. Strip cropping and uphill plowing resulted in a greater depth of OC. T: Average surface organic carbon values by slope position.

7806. Zobler, L. and L.T. Kardos. 1943. Exchangeable cation status and structure of Palouse silty clay loam.. Soil Sci., 55(2):147-158.
Exchangeable cation status and structure of Palouse silty clay loam as influenced by various cropping and fertility practices. An investigation was conducted into the effect of various cropping and fertility practices on the structure and exchange status of Palouse silty clay loam. Structure was evaluated by measuring the water stability of the aggregates, a wet-sieving procedure being used for the macroaggregates, and the Bouyoucos hydrometer for the microaggregates. The data indicate that mechanical forces dominate the formation of the larger aggregates, whereas physicochemical colloidal reactions govern the smaller granules. Plots cropped annually to wheat were found to possess a less stable macrostructure than those alternately cropped and fallowed. The microstructure of the annually cropped plots, however, appeared to be more stable as a result of the presence of more organic colloid. Additions of straw and manure resulted in greatest macrostability; alfalfa hay and straw supplemented with nitrogen, in less; and the check plots and the plots recieving NaNO3 alone, in the least. Microstructure was adversely affected when nitrogen was supplied as NaNO3 or (NH4)2SO4.

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