Effects of Cropping and Tillage Methods on Dry Aggregate Soil Structure
1963
Siddoway, F. H.
Dry aggregate soil structure and relative structural stability were compared for various crop rotations, straw residue placements, and methods of summer fallow tillage under dryland conditions. The proportion of nonerodible aggregates was greater when a straw residue was returned to the soil than when it was burned or partially removed. The increase in aggregation attributed to the residue was higher when the residue was left on the surface than when it was plowed under. The proportion of aggregates > 0.84 mm. in diameter was higher when fallow was initially tilled with the moldboard plow than when it was tilled with a one-way disk or sweep implement. The inclusion of grasses and legumes in rotation with winter wheat and fallow resulted in a lower proportion of nonerodible aggregates than under the more common wheat-fallow rotation.
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