The Effect of N, P, K, and Si Fertilizers on pH, P-available, P-uptake and Black Rice Yield (<i>Oryza sativa</i> L. indica) on Dryland Inceptisols

Black rice is a type of rice variety found in Indonesia and is well-known as a functional food with a high anthocyanin content which beneficial for those who consume it. Dryland has the potential to support growth of black rice plants, because it has a wide distribution in Indonesia, but has problems with soil fertility such as soil pH and low availability of P nutrients. The problem in dryland requires proper handling, one of which is by using N, P, K, and Si fertilizers. This study aims to determine the effect of N, P, K, and Si fertilizers on pH, P-available, P uptake, and yield of black rice (Oryza sativa L. indica) on dryland Inceptisols. This research was conducted from November 2020 to March 2021 at Soil Fertility and Plant Nutrition Research Area, Faculty of Agriculture, Padjadjaran University, Sumedang district, West Java and the analysis process at the Laboratory of Soil Chemistry and Plant Nutrition, Department of Soil and Land Resources Sciences, Faculty of Agriculture, Padjadjaran University. The experimental design was carried out using a randomized block design consisting of eight treatments with four replications. The doses of N, P, K fertilizers used were ¾ and 1 (Urea 300 kg ha-1, SP-36 50 kg ha-1, and KCl 50 kg ha-1) and the doses of silica fertilizer used were 2, 1½, and 1 (2 mL L-1). The results showed that the combination of fertilizer with a dose of 1 N, P, K followed by 1 silica gave the highest yield of black rice on dryland as much as 77.78 g plant-1 or equivalent to 10.58 t ha-1.