Applications of NPK Phonska and KCl Fertilizer for the Growth and Yield of Shallots (Allium Ascalonicum) in Serang, Banten
Resmayeti Purba

Abstract
Shallots is one commodity that has been developed in Serang Banten. Productivity of shallots produced by farmers is still low because farmers have not given fertilizer N, P and K impartial. Shallots need availability nutrient of nitrogen (N), phosphorus (P) and potassium (K) in sufficient quantities and balanced on the ground to be able to grow and produce optimally. NPK Phonska and KCl fertilizer properly can increase the growth and yield of shallots. This study aims to determine the growth and yield for application of NPK Phonska and KCl fertilizers. The experiments were conducted in farmers' fields in the district Kramatwatu, Serang, Banten from December 2013 to February 2014. The treatment were four levels of NPK Phonska fertilizer (0, 200, 250 and 300 kg/ha) and KCl (0,50,100 and 150 kg/ha). The experiment was arranged in a factorial randomized block design with four replications. Shallots variety used was Bima. Basic fertilizers used were Petroganic fertilizer with a dose of 5 t/ha and SP-36 as much as 200 kg/ha. The plots size 1.5 x 1.5 m and planting distance of 25 x 25 cm. The study showed that there interaction between NPK Phonska and KCl fertilizers on growth and yield of shallots. Application of NPK Phonska fertilizer of 300 kg/ha and 100 kg KCl/ha gave the best growth and yield shallots of plant height of 47.01 cm, number of leaves 43.55 sheet, tiller number 11.56 per cluster, the weight of the wet bulb 66.78 g per cluster, weight of dry bulb per plot of 2.4 kg/2.25 m2 (equivalent to 10.66 t/ha). NPK Phonska fertilizer application of 300 kg/ha and KCl fertilizer 100 kg/ha can increase the growth and yield, as well as economically feasible was ratio B/C of 1.01. Implementation of the fertilizer can be recommended to the farmers in Serang Banten.

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