Does variable rate liming pay?
As with other site-specific crop management strategies, the profitability of variable-rate liming depends on: 1) quality of information, 2) additional application cost and data collection and processing costs, and 3) the variability in lime requirement for the particular field. For instance, variable-rate liming will not be profitable if lime requirement is uniform or soil acidity is not limiting the yield. Also, liming may require several years to impact the yield and should be considered a long-term investment. Finally, poor quality of information used to prescribe variable-rate liming may result in inappropriate changes of lime application rates and therefore increase (rather than reduce) soil pH variability at the farmer’s expense. In a recent University of Nebraska–Lincoln study of the value of soil pH maps, it has been shown that the expected net return (crop sale revenue) over cost of lime (NRCL) during a four-year corn-soybean growing cycle is affected by the errors associated
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