Tanggap tanaman kedelai terhadap inokulasi Rhizobium daD asam indol asetat (IAA) pada ultisol Darmaga
Ningsih, Rina D.
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Some of rhizobacteria have been known to stimulate the growth of some crops through their fitohormon ~' (IAA =indoleacetic acid).. Those rhizobacteria can stimulate the developmenot f epidermisc ellsf ormation at root hair ;~ ' sitea ndi ncreaseth e infections itest o increaseth en odulationa ndN .?fzxationT.h ea imso f thiss tudyw eret o studyt he ~!i effect of Rhizobium strains inoculation and indole acetic acid (IAA) application on crop growth, root nodulation. and :!h N, P uptake of soybean on the Ultisols. The greenhouse experiment used Completely Randomize Design (CRD) with ;:~t;, four replications. The treatments were: I) Without inoculation (blank), 2) 100 ppm N application, 3) 0.4 ppm IAA '~~;c application, 4) Inoculation of Rhizobium 1004 (106),5) Inoculation of Rhizobium 1004 (I if) +IAA, 6) Inoculation of ~'!: Rhizobium RD-20 (104), 7) Inoculation of Rhizobium RD-20 (106), 8) Inoculation of Rhizobium SNI-2 (106). 9) l,':fi~ Inoculation of Rhizobium SNI-2 106+IAA. Result of the experiment indicated that inoculation of Rhizobium and IAA ..,.,~~" application increased crop growth, nodulation, and nutrient uptake of soybean. Inoculation of Rhizobium I 004(106). ~%;. RD-20(104)R, D-20(I06),S NI-2(I06), andIAA 0.4p pm increasedd ry weight of crop by 33.5%,37.8,17.3%,35.1%,a nd ~l; 3.8% respectively compared to blank. Application ofIAA at Rhizobium inoculation treatment ofSNI-2(106) and :iiJ~ 1004(106i)n creasedd ry nodule weight on soybean4 0.9%a ,nd5 5.7 % respel!tivelyc omparedt o without IAA application.