Effects of Brassinolide and Humic Acid on Chemical properties and NPK of Soil of Black Gram (Vigna mungo L.)

Abstract

The field experiment was conducted during the Kharif season of 2022-23 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 replications and eight treatments by using MASH-114 variety. The treatments were: T0-Control T1-(100% RDF), T2-RDF (Recommended dose of fertilizers) + 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.  According to the findings of a field investigation that humic acid and brassinolide had a considerable impact on nitrogen availability in the soil at the harvest stage of the black gram crop. Treatments (T6) and (T7) resulted in the most substantial increases in soil nitrogen levels compared to the control treatment (T0). The utilization of humic acid and brassinolide may have created a favorable environment in the rhizosphere, leading to an increase in microbial activity and mineralization. This, in turn, could have resulted in higher nitrogen (N) availability in the soil. Treatments T6 and T7 exhibited the most notable enhancements in soil potassium levels compared to the control treatment (T0). Soil chemical properties viz., pH, EC, NPK were also affected significantly due to application of humic acid through soil or foliarly in black gram.