Peranan Mikoriza VA, Rhizobium dan Asam Humat pada Pertumbuhan dan Kadar Hara Beberapa Spesies Legurn Penatup Tanah

Abstract

The utilization of acid mineral soil often faces the problem of A1 toxicity and low available P. The effbrts to improve rootfhnction and neutralize the effect of high available A1 are becoming important for increasing the growth of legumes, particularly as the cover crops at the plantation on acid soil. This research was aimed to find the efect of VA mycorrhyza inoculation, rhizobium, and humic acid on the growth and nutrient content of four dzferent legume species. It was a three factor factorial experiment arranged in a completely randomized design with three replications. The first factor was Hr legume species: Calopogonim mucunoides, Cdopogonium ceurelieum, Centrosema pubescens and Pueraria iwanica; the second factor was four different inoculants: none (Ma), W A (Md, rhizobium (MJ, MYA+rhizobim (Md; the third factor was two rates of humic acid application: without (Hd and with humic acid (HI). The results proved the positive effect of those three factors on the growth of shoot and roo& The responses of root growth on microorganism inoculations and humic acid were diferent among the legume cover crop species. The role of humic acid war signifcantiy better ifthere was a synergism between MVA and rhizobium.