The Effect of NPK Fertilizer on N Total, N-Uptake, and Shallot Yield (Allium ascalonicum L.) on Inceptisols Jatinangor

Abstract

Shallot (Allium ascalonicum L.) is a horticulture commodity that has a lot of benefits also prospective regarding its increasing demand. Each year, shallot productivity in Indonesia is unstable due to nutrient degradation on agricultural land, therefore efforts are needed to increase the productivity of shallot. One of the solution is by using NPK fertilization. This experiment aims to determine the effect of NPK compound fertilizer on N total, N-uptake, and shallot bulb yield. This research conducted at the Soil Chemical and Plant Nutrition Experiments Field, Faculty of Agriculture, Padjadjaran University, Jatinangor, from February to June 2019. The experimental design using Randomized Block Design (RBD) consisted of one control treatment as a comparison, one N, P, K single fertilizer treatment (250 kg ha-1 Urea, 125 kg ha-1 ZA, 200 kg ha-1 SP-36, and 250 kg ha-1 KCl), and eight NPK compound fertilizer treatments of various doses with three replications. The results showed that the NPK compound treatment affected the total N, N uptake, and shallot bulbs yield. Treatment of 75% NPK compound (675 kg ha-1 ) obtained the highest results of fresh bulbs weight at 41.64 g clump-1 and dry bulbs weight at 25.27 g clump-1 .