The effect of organic fertilizer and cobgn vmpost of volcanic ash on growth and yield of red chili (Capsicum annum L.)

The purpose of this study is to determine the effect of organic fertilizer and volcanic ash as composting material on growth and yield of red chili. This research was conducted in the village Payung, District of Tanah Karo, North Sumatera Province, started from May to September 2015. This research consists of several steps, those were the producing of the compost, analysis of chemical composition, and biological test by cultivating chilli seeds using organic fertilizer and compost of volcanic ash. Factorial randomized block design consisting of two factors and three replications namely organic fertilizer consisted of 3 levels is used on the experiment; without organic fertilizer, with organic fertilizer 5, 10 and 15ml/l, and compost of volcanic ash consists of 3 levels; without compost of volcanic ash, 1, 2 and 3 kg / m2. The data were analyzed with the variance α = 5% and continued by Duncan's Multiple Range Test α = 5%. The results showed that using of volcanic dust as composting matter had no statistically significant increase growth and yield of red chilli. Based on the results, chemical analysis of the soil showed improvement in soil fertility. The effect of organic fertilizer gave a real contribution to the plant height, the number of productive branches, fruit weight, also wet root weight and dry root weight.