Abstract
Andisol is a soil type which has very strong characteristic of binding phosphate nutrients, because bound by allophone clay minerals which can retain P up to 97.8%. Therefore, P in the soil not available for plants, while the total P in the soil is high. The availability of P for plants can be done by giving organic material and phosphate solubilising microbes. The aim of study is to determine the effect of using liquid organic fertilizer (LOF) and phosphate solubilising bacteria (PSB) Bacillus sp on potato growth in andisol soil. The design used was a factorial randomized block design with three replications. The treatments are first factor the LOF concentration {0 (control), 40.80 and 120 ml L−1 water} and the second factor the PSB Bacillus sp type {without bacteria (control), Bacillus cereus, Bacillus pseudomycoides and Bacillus amyloliquefaciens}. The results showed that the application of LOF with dose 40-120 ml L−1 water could not increase the potatoes growth compared to control. Application of PSB can increase the height and diameter (1.00 - 6.35%) wet and dry weight (1.57 - 27.28%) of potatoes plants compared to control. The application of 40 ml L−1 water LOF and PSB Bacillus amyloliquefaciens increased the number of potato tillers 41.36% from the control.
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