Yield of Shallot as Affected by Nitrogen on Water Hyacinth Compost and Inorganic Fertilizer at Fluventic Eutrudepts

Fluventic Eutrudepts is widely distributed in Indonesia but has low fertility to be used for agricultural activity. Soil nutrition availability could be enhancing by fertilization. The objective of this research was to determine the effect of water hyacinth compost and N, P, K, S fertilizer dosage on nitrogen rate in soil and plant, so quantity and quality in shallot. The experiment was held from March until June 2020 at Soil Chemistry, and Plant Nutrition Experimental Field, Agriculture Faculty, Universitas Padjadjaran, Jatinangor, Sumedang, at an altitude about ± 745 m above sea levels. This research used experiment method with Randomized Block Design, had seven treatments and four replications. The treatments were: control, 1 dosage of N, P, K, S fertilizer recommendation, the dosage of N, P, K, S fertilizer (1, ¾); and dosage of water hyacinth compost (½, 1, 1½). The result of this experiment showed that water hyacinth compost and N, P, K, S fertilizer dosage significantly affected on nitrogen rate in soil and crops, quantity and quality of shallots. The combination of ½ dosage of water hyacinth compost and ¾ dosage of N, P, K, S fertilizer effectively gave a better effect than other treatments.