Influence of Phosphorus and Boron on Yield and Chemical Composition of Sunflower

In afield experiment, the dry matter and seed yield of sunflower increased linearly with increasing levels of P up to 90 kg P₂O₅ ha_-1. Among the sources, boronated superphosphate produced significantly higher dry matter (34.45 q ha⁻¹) and seed yield (1259 q ha⁻¹) of sunflower. Plant and seed N, P and B increased due to each increment of P doses. Boronated superphosphate sho-wed highest concentration of N, P and B in dry matter and seed yield of sunflower over B + SSP.