Growth response of mustard greens (Brassica juncea L.) to nutrient formulations in hydroponic media

The production of mustard greens (Brassica juncea L.) by applying a hydroponic technique has been widely operated in urban areas. One of limited factor on hydroponic operation is a high spending cost on nutrition input i.e. AB Mix nutrition. The aim of this research was to evaluate the effectiveness of NPK for substituting AB Mix on hydroponic operation of mustard greens. The research was conducted at BPTP Jakarta, from February to April 2021. Five combinations of NPK substitution on AB Mix were evaluated, namely: 100% AB Mix as control (H0), 75% AB Mix - 25% NPK (H1), 50% AB Mix - 50% NPK (H2), 25% AB Mix - 75% NPK (H3), 100% NPK (H4). All the treatments were arranged on a completely randomized design with 4 replications. The results showed that combination of AB Mix 25% + NPK 75% (H3) yield mustard greens growth similarly with the control plant (100% AB Mix). This finding approved that proportion of NPK for AB Mix substitution was appropriate up to 75% on hydroponic operation for mustard greens cultivation.