Pengaruh Kompos yang Diperkaya Bakteri penambat Nitrogen dan Pelarut Fosfat Terhadap Pertumbuhan Tanaman Kapri dan Aktivitas Enzim Fosfatase Dalam Tanah

The use of organic materials on cultivation of vegetable crops has some advantages, especially for maintaining suitable soil condition and decreasing the utilization of inorganic fertilizers. The research was carried out at Cidawu Village, Cibodas (1,250 m asl.), cianjur, West Java, from January to December 2007. Soil samples were collected from some different areas in Pontianak, West Kalimantan. The research was aimed to determine the effect compost enriced with mixed phosphatase solubilizing bacteria (PSB) on the growth of peas and on the activity of phosphate enzymes in the soil. A randomized block design with five treatments were the addition of fertilizers consisted of (A) without any fertilizer, (B) with inorganic fertilizers i.e. TSP + KCl + Urea, (C) with chicken dung + rice husk, (D) with compost plus (compost enriched with symbiotic nitrogen fixing bacteria/SNFB, nonsymbiotic nitrogen fixing bacteria/NSNFB, and PSB). The result showed that the mixed bacteria isolated from peat soil in west Kalimantan in the compost plus (treatment E) properly adapted in soil conditions at the site of the of the experiment. The total populations of SNFB, NSNFB, and PSB were increased upto 9.15 x 108, 9.34x108, and 9.35x108 cell/g soil, respectively. The ocurrence of the mixed bacteriincreased the activity of acid and alkaline phosphatases in the soil. The highest activities of acid and alkaline phosphomonoestarase enzymes in the soil achieved by the treatment of compost plus. The treatment increased the fresh weigh of pess compared to control (75.32 persen), to the chemical fertilizers (45.48 persen), to chicken dung + rice husk (31.19 persen), and to compost (15.60 persen). The widely application of the mixed PSB in compost is hopefully established in cultivation of peas in the organic farming (OF) system, then it will confidently support on the increase of peas production, and the decrease of in organic fertilizers as well. J. Hort. 20(3):207-215, 2010