Effect of Brassinolide and Humic Acid on NPK Content and Uptake in Black Gram (Vigna mungo L.)

Abstract

The field experiment was conducted during the Kharif season of 2022-2023 at the Lovely Professional University, Jalandhar, Punjab. To study the effect of brassinolide and humic acid on growth and yield of black gram. The experiment was laid out in a Randomized Block Design (RBD) having three replication and eight treatments by using MASH-114 variety. The treatments were: T0-Control T1-(100% RDF), T2-RDF + Humic acid 20kg ha-1 (Soil applied), T3-RDF + Humic acid 0.1% (Foliar applied), T4-RDF + Brassinolide 0.25ppm (Soil applied), T5-RDF + Brassinolide 0.1ppm (Foliar applied), T6-RDF + Humic acid 20kg ha-1 + Brassinolide 0.25ppm (Soil applied), T7-RDF + Humic acid 0.1%+ Brassinolide 0.1ppm (Foliar applied) were used for this study. The study showed that the combined foliar application of RDF + humic acid 0.1% + brassinolide 0.1 ppm (T7) consistently recorded the highest nutrient content and uptake in black gram straw and plants. T7 achieved the maximum nitrogen (0.97%), phosphorus (0.69%), and potassium (0.80%) content in straw, along with superior nutrient uptake, including N (46.36 kg ha⁻¹), P (15.26 kg ha⁻¹), and K (36.23 kg ha⁻¹). These values were closely followed by soil-applied T6 (RDF + humic acid 20 kg ha⁻¹ + brassinolide 0.25 ppm). Overall, foliar nutrition through T7 proved most effective in enhancing nutrient accumulation and uptake, demonstrating its potential as an efficient and sustainable strategy for improving black gram productivity.