Combination of NPK fertilization and Foliar Application for Increasing the Yield of Citrus Fruit

Abstract

The research aimed to obtain the best combination of NPK fertilizer dose and foliar application frequency for increasing the yield of citrus. The research was conducted from June 2019 to April 2020 at the Ex-farm belongs to Faculty of Agriculture, Jenderal Soedirman University. The research used Randomized Completely Block Design (RCBD) with two factors. The first factor was the NPK fertilization doses: 0, 25, 50 and 75 g/tree, the second one was frequency of foliar application: 0, 2, 4 and 6 times. The results showed that the combination of NPK fertilizer 75 g/tree and frequency of foliar application 6 times gave the highest number of flowers, fruitset, number of fruits, and weight per fruit. NPK fertilization of 75 g/tree gave the highest fruit diameter, and the lowest fruit drop. Foliar application of six times increased the diameter of the fruit and reduced fruit drop compared to control.