Pengaruh Fosfat Alam dan Kombinasi Bakteri Pelarut Fosfat dengan Pupuk Kandang terhadap P Tersedia dan Pertumbuhan Kedelai pada Ultisol

Abstract

The aim of this experiment were to evaluate the eflect of rock phosphate application and combination phosphatesolubilizing bacteria and farm yard manure on soil available P and growth of soybean on UItisol $-om Kentiong village, Banten province. Factorial experiment design with two factors was used in randomized complete block design with three replications. %first factor was rock phosphate i.e. : 0, 30, 60, and 90 kg P/ha, and the second factor was combination of phosphate solubilizing bacteria (PSB) and farm yard martwe (FYM) i.e. : without PSB and FYM (control), PSB (Pseudomonas jluorescens), FYM 10 t/ha, and PSB+FYM Results indicated that significant positive eflect of rock phosphate and combination of PSB and FYM application occurred on soil available P, number and dry weight of n&, dry wight of rod and shoot. Rock phosphate application with rates of 30, 60, 90 kg P/ha increased soil available P 247%, 356% and 592% respectively compared to without P. Phosphate-solubilizing bacteria, farm yard marwe and PSB+FYM increased 27%, 330% dun 48% respectively compared to confrol. Phosphate-solubilizing bacteria and f m yard manure combination with phosphate rock 30 kg P/ha dosage increased dry weight of soybean shoot 29% compared to control.