Abstract
Abstract Maize (Zea mays L.) was sampled at five selected stages of growth from two phosphorus (P) fertility experiments in 1983 and 1984 to establish the correlation between two procedures for measuring phosphorus in plant tissue. Sampling took place at the eight leaf, twelve leaf, early silking, early denting and full maturity stages of growth. Tissue samples were analyzed for total ? (TP) in a HNO3‐HClO4 acid digest and PO4‐P in a dilute acid extract (DAEP). The rapid inexpensive DAEP procedure was highly correlated with TP at growth stages prior to full maturity. Limited analyses of wheat tissue at Feekes stage five also showed high positive correlation between TP and DAEP. Slopes for TP‐DAEP regression equations (by stage of growth) across locations and environments were found to be the same. Locations and years did not affect the linear TP‐DAEP relationship, but did alter the respective regression equation intercepts. Adjusted intercept regression equations can therefore precisely estimate TP concen...
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