Impact of various nutrient sources on growth dynamics, microbial biomass, and yield in field bean (Dolichos lablab L.)

Abstract

A field experiment was conducted during the summer of 2024 at the Agriculture Research Station in Nelamakanahalli, Chikkaballapur, Karnataka, India, to investigate the “Impact of various nutrient sources on growth dynamics, microbial biomass, and yield in field bean (Dolichos lablab L.)”. The experiment included eleven treatments arranged in a Randomized Complete Block Design (RCBD) with three replications. The primary objective was to evaluate the effects of different nutrient sources on the growth dynamics, microbial activity, and overall yield of field bean. The results indicated that applying 100% of the recommended dose of fertilizers, combined with two nano-fertilizer sprays at 30 and 45 days after sowing, significantly enhanced plant growth. This treatment led to an increased number of branches per plant (6.22) and a larger leaf area per plant (841.5 cm²) at harvest. Furthermore, it achieved the higher seed yield (1139 kg ha⁻¹) and haulm yield (2114 kg ha⁻¹), outperforming all other nutrient treatments and the absolute control. In contrast, the absolute control consistently recorded the lower values across all measured parameters. Hence, the study demonstrates that applying 100% RDF along with two nano-fertilizer sprays at 30 and 45 DAS effectively boosts field bean growth and yield. This approach not only maximizes productivity but also supports soil health, making it a recommended practice for sustainable field bean cultivation.