Ida Nur Istina, Nurhayati, Jakoni
Abstract: Combination of OPEFB compost ameliorant and P fertilization significantly influences the availability of P nutrients on the ground even though the total is not significantly different. This indicates that the provision of ameliorant alone is still not able to increase the availability of nutrients, especially P content on peat soils. This can be understood because the P nutrients in peat soils are available in minimal quantities, even the presence of organic acids that bond the P elements causes P in peat soils is un-available. So it needs to be added in volume high enough to meet the needs of plants growth. The addition of 75 % P nutrient from the recommended dose gives P available is not significantly different from 100 % recommended dose, this indicates that fertilization of 75 % of the recommended dose can increase the availability of P nutrient in peat soils. Table 4 also indicates that phosphate solubilizing microbe inoculation contributed to the increasing P nutrients available, although not yet signed. Phosphate solubilizing microbe activities by excreting organic acids that wet the environment and release P bonds.
Keywords: soil nutrients, compost, Burkholderia gladioli, Penicillium aculeatum