proceedings of the integrated crop management proceedings of the 10th annual integrated crop conference management conference nov 18th 12 00 am soil sampling strategies for variable rate p and k ...
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...Proceedings of the integrated crop management th annual conference nov am soil sampling strategies for variable rate p and k fertilization liming antonio mallarino iowa state university apmallar iastate edu david wittry follow this additional works at https lib dr icm part agriculture commons agronomy sciences thesoil science event is brought to you free open access by conferences symposia digital repository it has been accepted inclusion in an authorized administrator more information please contactdigirep associate professor research department introduction fertility can be greatly improved with use precision technologies differential global positioning systems dgps yield monitors aerial photographs technology improve both evaluation fertilizer or lime application field most important source error testing a very small amount needs appropriately represent thousands tons usually there large spatial variability nutrients intensive efficacy compared conventional practice collecting sampl...