The Effect of Addition Azotobacter Microbial Culture on Cow Feces as a Plant Fertilizer

The purpose of this study was to analyze the effect of adding Azotobacter microbial culture on cow feces as plant fertilizer. The material used was 360 kg of cow feces, 20 kg of rice husk, 20 kg of rice bran and 750 ml of Azotobacter microbial culture, 30 liters of water, 9 liters of molasses, Odot (Pennisetum purporeum cv. Mott) grass cuttings, corn (Zea mays saccharata) seeds and Edamame (Glycine max L Meril) seeds. This research method is an experiment. The design was a Completely Randomized Design (RCD) with 4 treatments and 6 replications. The treatment was T₀, namely the use of feces without the addition of Azotobacter microbial culture, T₁ with the addition of 150 ml/100 kg of material, T₂ with the addition of 250 ml/100 kg of material and T₃ with the addition of 350 ml/100 kg of material. The variables observed were plant height, number of leaves, leaf width, number of branches and number of tillers. Plant height was significantly different (P<0.05) from treatment, for all plants. The addition of 350 ml/100 kg of material, gave the highest plant height on Odot grass, corn and Edamame by 33.60 cm, 86.8 cm, and 26.14 - 1.89 cm, respectively. This is due to the highest element K which plays a role in maintaining turgor pressure and ensuring the continuation of cell elongation. From this study it can be concluded that the addition of Azotobacter microbial culture can increase the nutrient content of compost with cow feces material. When used as fertilizer, it can increase plant growth.