Abstract
Abstract The effect of P fertilizers (10–30–0, 10–30–0‐7S, DAP, and MCP) on movement and availability of Fe from a fertilizer band was determined as well as on soil pH and availability of native soil Mn and Zn. The fertilizers were banded at a rate of 50 mg P/kg with 25 mg Fe/kg as FeSO4 and incubated at field capacity moisture and 25°C in a closed system for 35 days. An Fe‐deficient calcareous soil (clareville fsl Pachic Agriustoll) was used in this study. The soil pH in the fertilizer band was decreased about 0.5 pH unit by each P fertilizer after 7 days incubation and decreased slightly further at 35 days. This influence of P fertilizers on soil pH extended as far as 2.0 cm from the band. The quantity of extracted Fe tended to increase somewhat with time to 35 days. The DAP‐P source tended to be the most effective on extractable Fe. Extractable Mn and Zn tended to decline with time of incubation. Extractable Fe decreased with increasing distance from the band and movement was restricted to about 1.5 cm.
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