Evaluation of various levels of phosphorus and sulphur on yield and economics of blackgram (Phaseolus mungo L) in Vylogam soil series of Madurai district

A field experiment was conducted to study the interaction effect of phosphorus and sulphur on improvement of productivity of blackgram (VBN 4) in Vylogam soil series of Madurai district, Tamil Nadu during kharif season 2017. The experiment was laid out in a factorial randomized block design with three replications having 25 treatment combinations viz five levels of phosphorus (0, 20, 40, 60 and 80 kg P₂O₅/ha) applied through diammonium phosphate as factor A and five levels of sulphur (0, 20, 40, 60 and 80 kg S/ha) applied through elemental sulphur as factor B. The results revealed that application of P upto 60 kg/haand increasing levels of sulphurupto 40 kg/ha proved to be the best treatments in improving the grain and haulm yield. Higher doses of phosphorus and sulphur did not increase the parameters further. Thus interaction of phosphorus and sulphur exhibited a strong synergistic relationship at P₆₀S₄₀ kg/ha on yield of blackgram with grain yield (1103 kg/ha) and haulm yield (1683 kg/ha) in Vylogam soil series of the district.