The factors of acid soil fertility and crop responses to acid soils are complex. Not all acid soils need lime, nor should all lime-responsive soils be brought to the same pH. Soil tests for lime requirement must be selected and calibrated to provide for the differences among soils and among the crops to be grown on them. This monograph highlights knowledge in these and other areas and points out the many challenges that lie ahead. It, as its predecessor, will serve as a benchmark from which future progress can be established.
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