Browse on keywords: crop rotation WA soil structure
Search results on 01/20/18
1802. Elliott, L.F., R.I. Papendick, and D.F. Bezdicek. 1987. Cropping practices using legumes with conservation tillage and soil benefits.. IN: J.F. Power (ed.) The role of legumes in conservation tillage systems.
A review article covering examples from around the world as well as specific research from WA. Discusses the role of legumes in maintaining soil productivity, and the constraints on their use. Describes research with several rotations and several legumes in a wheat based system. Wheat yields following red clover were highest of any of the legumes. When any of the legumes was chemically killed, winter wheat yields planted into the residue declined dramatically. T: effect of Medicago on wheat yield; commonly planted legumes and their characteristics; effect of tillage, rotation, and N rate on wheat yield (WA); legume N production and water use (WA); residual soil water under various crops (WA).
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.