Influence of humic and fulvic acid addition on soil N P K availability and broad bean output (Vicia Faba L.)

Abstract

A field experiment was carried out during the agricultural season 2021-2022 at Al-Muthanna Governorate to study the effect of adding humic and fulvic acid in the soil on the availability of N P K in the soil, a simple RCBD experiment was designed with three replicates, it included the addition of a mixture of humic and fulvic acid (0, 5, 10 and 15) for L ha-1. The results showed a significant superiority in increasing the concentration of availability NPK in the soil; the H2 treatment gave the highest rate of 204.00 and 32.76 mg kg soil-1 for NK elements, respectively. The H3 treatment also showed the highest increase in the concentration of significant factors availability NPK in the soil after harvest; it reached 28.62, 14.30 and 155.00 mg kg soil-1, respectively. The highest individual yield was 169.00 g plant-1 when treated with H3, compared to the control treatment, which amounted to 134.80 g plant-1. Keywords: Humic, Fulvic acids, Faba beans, NPK