Optimalisasi Pemberian Unsur Hara NPK dan Asam Humat pada Produktivitas Kacang Hijau (Vigna radiata L.)

Abstract

Excessive use of synthetic fertilizers causes soil degradation which results in low Indonesian mung bean production. The use of humic acid is expected to improve the quality of the soil to increase mung bean production. This study aims to determine the response of mung bean plants to the application of NPK combined with humic acid. The experiment was designed using a randomized block design (RBD) with two factors and three replications. The first factor was NPK fertilizer consisting of 75, 150, and 225 kg/ha. The second factor is humic acid consisting of 0, 6, 9, and 12 kg/ha. The results showed that there was an interaction between the two treatments tested on the number of fertile nodes and dry seed weight per plot. In the number of productive branches, there was no significant difference between humic acid doses of 6, 9, and 12 kg/ha. Moreover, NPK 225 kg/ha showed the highest yields on plant height and number of pods. Seemingly, the use of humic acid improves various soil properties which in turn has a positive effect on the absorption of NPK fertilizer nutrients as shown in this study.