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Trends in Olsen P test over time for the Waikato region

TR 2004/09
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Report: TR04/09

Author: DM Wheeler, Agresearch

Abstract

Olsen P data extracted from database of soil fertility data obtained from commercial soil testing lab for the period 1988-2001. Samples were categorised according to land use or soil group (sedimentary, volcanic, pumice, peat).

Olsen P measurements lend themselves to monitoring change over time. This report gives trends in Olsen P levels over time for different land use and soil types for the Waikato region.

Trends In Olsen P Test Over Time For The Waikato Region [PDF, 70 KB]