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Green mustard ( Brassica juncea  L.) is a vegetable that has a high economic value. The application of fertilizer was important to increase crop production. This study aims to calculate the nutrient requirement to get the optimal yield production. The method used survey methods (qualitative research) on June-July 2020. The conventional planting experiment design was 20 × 20 cm spacing/plant in 1 hectare. The percentage of N used the Kjeldahl method, whereas the P, K, and Mg using Spectrophotometry, and the data were analysed by Microsoft Excel, 2013. The variable observed i.e. wet weight (g), dry weight (g), M d  dry basis (%), the percentage of N, P, K, and Mg, and total fertilizer needed for 10 ton/ha; 20 ton/ha; 30 ton/ha, and 40 ton/ha. The results were N 3.857 %; P 0.721 %; K 3.827 %; and Mg 0.366 %. Wherein, the average weight of wet green mustard was shown 91.014 g wherein the dry weight of 6.718 g. The M d  (dry basis) was 12.54. The fertilizer complex recommendation to green mustard for optimal yield up to 40 ton/ha was 5.45 g/pot. In this case, a total of urea 2.46 g/pot, SP-36 0.57 g/pot, KCl 1.83 g/pot, and dolomite 0.58 g/pot.

Fertilizer effectiveness based on nutrient requirement from yield of green mustard (Brassica juncea L.)