Application of liquid organic fertilizer from city waste on reduce urea application on Chinese mustard (Brassica juncea L) cultivation

Chinese mustard (Brassica juncea L) was grown on Andisol Soil with low pH (5.1), very low total N 0.67 %, medium P2O5 concentration (7.0 ppm), and very high K content (134.8 ppm) to evaluate the best concentration of liquid organic fertilizer (LOF) from city waste on reduce urea application. Eleven urea and liquid organic fertilizer combination (1 = 100 % Urea + 0 LOF, 2 = 100 % Urea + 25 ml l-1 LOF, 3 = 75 % Urea + 25 ml l-1 LOF, 4 = 50 % Urea + 25 ml l-1 LOF, 5 = 100 % Urea + 50 ml l-1 LOF, 6 = 75 % Urea + 50 ml l-1 LOF, 7 = 50 % Urea + 50 ml l-1 LOF, 8 = 100 % Urea + 75 ml l-1 LOF, 9 = 75 % Urea + 75 ml l-1 LOF, 10 = 50 % Urea + 75 ml l-1 LOF, and 11 = 0 % Urea + 50 ml l-1 LOF) were arranged in a randomized completely block design with three replications. The results showed that combination of liquid organic fertilizer and urea increased Chinese mustard growth and yield in low N soil. The best treatment is the combination of 50 % Urea + 75 ml-1 but not significantly different than others combination. Liquid organic fertilizers from city waste reduce 50 % Urea application, and 25 ml l-1 concentration of LOF is efficient on Chinese mustard cultivation as an alternative nutrition source.