Response of Soybean (Glycine Max) to The Reduction of Inorganic Fertilizer with Palm Oil Factory Waste Decanter Cake

Abstract

This research was conducted to determine the response of soybean plants when inorganic fertilizers were reduced and replaced with palm oil mill waste decanter cake. This research was conducted at Farmers’ Land in Harapan Makmur Village, Rantau Rasau District, Tanjung Jabung Timur Regency. This study uses a one factor randomized block design, namely decanter cake and inorganic fertilizer (NPK) consisting of 7 levels, namely: 100% NPK fertilizer, Trichoporiza Plus (TP) 5, 10 and 15 ton/ha, TP 15 ton / ha + 50% NPK dose, TP 10 tons/ha + 50% NPK dose, and TP 5 tons / ha + 50% NPK dose. The parameters observed were plant height, number of leaves, number of branches and number of pods. The results showed that the response of plants to the reduction of 50 percent inorganic fertilizers substituted with TP 15 tons per hectare give the highest of plant height, number of leaves and number of branches but TP 10 ton/ha give the highest number of pod. All parameters shows that there is no significant difference between 10 tons per hectare and 15 tons per hectare of TP in the reduction of 50 percent NPK fertilizer.