Productivity Enhancement in Blackgram (Vigna mungo L.) through Foliar Application of Potassium Salt of Active Phosphorus (PSAP)

A field experiment was conducted at the Instructional Farm, College of Agriculture, Vellayani during December 2023 to March 2024, to assess the performance of blackgram in terms of yield. The field experiment was laid out in Factorial Randomized Complete Block Design (FRCBD) with 12 different treatment combinations and one control treatment, which were replicated thrice. The treatments comprised of two fertilizer sources (s1- nano-DAP, s2- PSAP), three concentrations (c1- 0.1%, c2- 0.2 % and c3- 0.4 %) and two nutrient levels (l1- 100% RDN and l2- 75% RDN) which were compared against a control (KAU POP). The treatment s2 (PSAP) showed earliness in reaching days to 50 % flowering and highest in number of pods per plant, pod length, pod weight, number of seeds per pod, pod yield and seed yield compared to s1. Among concentrations 0.4 % (c3) took lesser days to reach 50 % flowering and highest in number of pods per plant, pod length, pod weight, number of seeds per pod, pod yield and seed yield compared to c1. Whereas in nutrient levels 100 % RDN (l1) recorded highest in seed yield compared to 75 % RDN (l2) in blackgram.