Crop growth across a toposequence controlled by depth of sand over clay [cereals, lupins]
1988
Hamblin, A. | Richards, Q. (Commonwealth Scientific and Industrial Research Organization, Wembley (Australia). Div. of Plant Industry) | Blake, J. (Western Australian Dept. of Agriculture, Perth. Soil Conservation Service)
Spring wheat and barley, cereal rye and narrow-leaf lupin were sown at 3 adjacent sites on a slope with increasing sand depth downslope, over 2 seasons. There was a significant decline in dry matter accumulation and yield with sand depth, wheat biomass and lupin grain yield being most affected. Available water was least and leaching most severe on the deepest sand. Maximum rooting depths averaged 2 m for wheat and 2.4 m for the other crops; however, even where roots went deepest, into the deepest sand, yields were reduced to half.
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