WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Sunday, July 22, 2018

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Search results on 07/22/18

1810. Elliott, E.T.. 1986. Aggregate structure and carbon, nitrogen, and phosphorus in native and cultivated soils.. Soil Sci. Soc. Am. J., vol.50, p. 627.
Native sod soil had the same general structural characteristics as cultivated soil but the macroaggregates were more stable. The macroaggregate-microaggregate conceptual model is applied to help explain accumulation of soil organic matter under native conditions and its loss upon cultivation. Losses of organic C and N correlated with the reduction of soil structure and increases in erodability.

10377. Pierson, F.B. and D.J. Mulla. 1990. Aggregate stability in the Palouse region of Washington: effect of landscape position.. Soil Sci. Soc. Amer. J. 54:1407-1412.
Spatial patterns of aggregate stability were studied in the steeply rolling Palouse hills. Aggregate stability and organic C content were highest in footslope and toeslope positions, and lowest at the summit. Clay content was just the opposite. Aggregate stability patterns were closely related to changes in a few key properties, namely, organic C content and landscape position. Soil erosion had removed topsoil and organic matter from the ridgetops, thus exposing subsoil horizons which are higher in clay content and lower in aggregate stability.

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