Effect of Fertilization with Phosphorus, Sulphur and Micronutrients on Yields of Peppers Growing on an Alkaline Soil

Abstract

Two sweet pepper cultivars growing on an alkaline (pH 8.0) Santa Isabel clay (Udic Pellusterts) did not respond in yield to three levels of phosphorus fertilization, to foliar or soil applications of minor elements, or to three rates of sulphur applied to the soil, which decreased pH to as low as 5.5. Soil samples taken in the root zone of the pepper plants 6 months after planting showed that the commonly used acid-residue fertilizers had decreased pH to 7.4.