Abstract
The purpose of this research was to study whether the application of brown algae (Sargassum polycystum) compost can increase productivity and reduce the amount of water needed by soybean (Glycine max L.) plants. This research was conducted from July 2017 to September 2017 at Pasar 1 Tanjung Sari land, Medan Selayang sub-district. The research design used was Factorial Randomized Group Design with two factors. The first factor was watering with various levels of water content, with K1 = 100% field capacity, K2 = 75% field capacity, K3 = 50% field capacity, K4 = 25% field capacity, the second factor was the application of brown algae compost consisting of G0 = 0 gram/plot, G1 = 1,125 kg/plot, G2 = 2,250 kg/plot, G3 = 3,375 kg/plot. The observed parameters were plant height, stem diameter, number of leaves, pod wet weight, canopy wet weight, pod dry weight, canopy dry weight, 1000 seed weight, and seed weight. The results showed that the effect of various watering levels of water content and the application of brown algae compost had a significant effect on plant height parameters at 4 Weeks After Planting, brown algae had a significant effect on canopy wet weight per plot and canopy weight per sample. The cause of soybean production not reaching production of 3 tons/ha was the effect of boron.
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