When implementing different precision agriculture practices, site-specific management of soil pH has been shown to be one of the most promising strategies in fields with substantial variability in soil pH.

Justification of variable-rate liming is complicated by the following: liming is a long-term investment; lime requirements across fields are not always highly variable; and the conventionally implemented 2.5-acre grid soil sampling does not provide the sampling density needed to accurately determine the variability of soil pH in many fields.

The recently commercialized technology of on-the-go soil mapping provides a better basis of information about spatial variability of soil pH and other properties related to buffering characteristics (i.e., electrical conductivity).

With proper consideration of all the information available, an optimized strategy for site-specific pH management can be developed and positive economic and environmental impacts can be achieved.

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