Effect of erosion on productivity of wheat grown on red brown earths in the Northern slopes of New South Wales, Australia
1988
Elliott, G.L. | Campbell, B.L. | Crough, R.J.
Erosion-productivity studies have generally failed to address two issues: (i) the need to make real crop yield and net erosion measurements under practical farm management conditions, and (ii) the need to measure as many yield limiting factors as possible, in addition to erosion. The reported study is based on the correlation of measured soil loss with residual soil caesium-137 content, which makes possible the estimation of average net erosion on sites with a uniform management history. The methodology eliminates anomalies associated with the measurement of erosion and greatly expands suitability of sites for a variety of measurements. This study reports multiple linear regression relationships for yield of straw and grain against soil-NO3, soil-HPO4, soil-K, organic carbon content, pH, stored moisture plus rainfall, length of growing season, soil bulk density and estimated soil erosion. With some qualification the permanent effect of erosion on productivity has been determined in this study to be 0.35 % per year per unit of log. soil loss.
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