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Abstract
Ultisols has problems of low availability of nutrients, especially phosphorus. To improve soil phosphate and P fertilizer efficiency, it is necessary to develop biofertilizer such as phosphate solubilizing microbes. Phosphate solubilizing microbes (PSM) have the capability of dissolving soil phosphorus which have been adsorbed and can mineralize organic P to become inorganic P, hence increasing the avalibility of P in the soil. Phosphate solubilizing bacteria (Pseudomonas mallei and Pseudomonas cepacea) and phosphate solubilizing fungi (Penicillium sp. and Aspergillus sp) were selected based on their ability to dissolve P. The experiment was conducted at Jatinangor, West Java Indonesia to study the application of PSM biofertilizer to increase soil P and yield of maize. Experiment used a Randomized Block Design (RBD) in factorial pattern, consisting of two factors with three replications. The first factor consisted of PSM biofertilizer, which were; without PSM, 5 L ha-1 of PSM and 50 kg ha-1 of PSM. The second factor was P fertilizer with five levels (0%, 25%, 50%, 75% and 100% dosage of recommendation). The results showed that the application of PSM biofertilizer increased soil phosphate and yield of maize on Ultisol Jatinangor. The dosage of P inorganic fertilizers was reduced by 50%.Keywords: ultisol, maize, biofertillizer, phospate-solubilizing bacteria.
Highlights
Many efforts to improve the productivity of Ultisols, one of them with fertilizer into the soil in the form of synthetic fertilizers or natural fertilizers
The application of Phosphate solubilizing microbes (PSM) biofertilizer were mixed with cow manure (2 t ha−1) two days before planting
Experiment design was used randomized block design factorial design with three replications composed of two factors: I
Summary
This soil has probems for planting as has a high acidity, low macro nutrients, low organic matter content and low soil microbial activity. Ultisols soil has a high P content but largely unavailable to plants. Low P availability due to fixation of P by Al or Fe on Ultisols [1]. Many efforts to improve the productivity of Ultisols, one of them with fertilizer into the soil in the form of synthetic fertilizers or natural fertilizers.
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