Substitution of ZA with organic fertilizer on the cultivation of porang (Amorphophallus muelleri Blume)

Abstract

Climate change causing problems for many cultivated crops. Porang (Amorphophallus muelleri Blume) requires specific environmental and climatic conditions to grow optimally. Fertilization is one of the efforts to increase the yield of porang in the midst of unpredictable climate change. This study aims to determine the effect of substitution (inorganic with organic fertilizer) on porang cultivation to get the right fertilizer dosage to recommend to farmers. This research was held on March - July 2020 in BKPH Pojok agricultural land, Purwodadi, Central Java which has an average elevation 498.7 m asl and a normal temperature range between 26 -28,5 Celcious. This research was using Randomized Completely Block Design (RCBD) one factor - dosage comparison of ZA and organic fertilizer consist of: 100:0%, 75:25%, 50:50%, 25:75%, 0:100%, and 0:0% in four replications. The highest yield was obtained by treating 100% ZA fertilizer (increasing yield of 86.79% with a total yield of 19.8 tons/ha). Substitution of 75% ZA fertilizer with 25% organic fertilizer and 100% organic fertilizer gave no significant difference effect (increasing yield of 32.08% - 37.73% with total yield of 14 - 14.6 tons/ha).