WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Tuesday, January 16, 2018

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Search results on 01/16/18

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.

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..

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.

10672. Huyck, L.M.. 1989. Effects of slope position, season, and long-term management on aggregate stability in an organically and conventionally farmed Naff silt loam.. M.S. thesis, Dept. Crop & Soil Sciences, Washington State Univ., Pullman, WA 99164-6420.
Aggregate stability was compared on adjacent fields under contrasting long-term management. Samples were taken in October, March, and June and tested for aggregate stability for the 0.5-1.0 mm size fraction. Stability decreased significantly going upslope, and also after freezing and thawing. Each farm had its own pattern of stability. Soil carbon was highly correlated with stability on the organic farm, but not on the conventional farm. While stability was significantly higher on the organic farm under certain instances, this was not always the case and no conclusion can be drawn about which system had better aggregate stability.

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