Nguyễn Khánh Hoàng1, Lê Hùng Anh1, Michael Böhme2
1. Industrial University of Ho Chi Minh City, Institut of Environmental Sciences, Viet Nam.
2. Humboldt-Universität zu Berlin, Dept. Horticultural Plant Systems, Germany.
Abstract: Chemical fertilizer has been replaced by liquid waste of biogas plant for rice cultivation in the pilots scale at Hau My Bac B ward, Cai Be, Tien Giang, Viet Nam with four different proportions of Nitrogen source designed: 100% chemical fertilizer (mode 1 – control); 100% bio fertilizer (mode 2), 50% chemical fertilizer plus 50% bio fertilizer (mode 3) and 75% chemical fertilizer plus 25% bio fertilizer (mode 4). The result show that the leaf’s color in the range of 3.75 (baseline N dose) to 4 (high N dose) and the rice’s height of mode 1, 2, 3, 4 with respective value 78.5±2.06, 75.0±3.00, 73.5±4.09, 72.5±3.04 cm were not significant different. On the other hand, the length of node is difference between mode 1, 2, 3, 4 were respective value 4.75±0.43, 2.88±0.53, 4.75±1.77, 3.48±0.82 cm. The farmer’s experience leading to the result of nutrient composition of soil has much variation compared to the initial parameters. Although the nutrient content of the experimental formulations was not significantly different. However, the microbial density of the formula using 100% bio fertilizer showed that lower than other formulas. Based on initial analysis results, the liquid waste from the Biogas plant can be used as a biofertilizer source to replace chemical fertilizer in rice cultivation.
Keywords: Biogas, liquid waste from Biogas plant, Bio-fertilizer
Pages: 25 – 31 | Full PDF Paper