Phosphorus Fertilizer Management for Head Cabbage

Abstract

Repeated long-term applications of blended fertilizers (containing N, P, and K) have resulted in soil P levels that are in excess of optimal in many situations. Field experiments on five farms (on three soil series) compared farmer practice (blended fertilizers) with applying urea-N alone. Data were used to develop a soil P critical range beyond which further P need not be applied. Cost analysis compared farmer practice with the recommendations developed by the research.