Abstract
This study aims to investigate the effect of biochar and phonska as well as its interaction on the growth and yield of corn crops. This experiment used a randomized block design (RBD), a factorial pattern with 2 factors. The first factor was the biochar dose consisting of 4 levels, ie: without biochar, 5 t ha-1, 10 t ha-1, and 15 t ha-1. The second factor was the dose of phonska fertilizer consisting of 2 levels: without phonska and 300 kg ha-1. The results showed that the dose of biochar 10 t ha-1 gave the highest dry weight of seed per hectare of 8.12 tons, an increase of 32.77% compared with without biochar of 6.12 tons. The treatment of phonska fertilizer dosage of 300 kg ha-1 gave the highest dry weight of seed per hectare of 8.07 tons and the increase of 26.68% compared with without phonska of 6.37 tons. Based on a result of regression analysis test obtained optimum dose 10.44 t ha-1 with a dry weight of seed per ha maximum 7.90 ton. 
 
 Keywords: charcoal, bamboo biochar, NPK phonska, corn
Highlights
Corn (Zea mays L.) has an important role in the fulfillment of food for some people
This study aims to determine the effect of biochar dose and phonska fertilizer and its interaction on growth and yield of corn crops
The materials used in this research are seeds of Bisi-2 hybrid corn, biochar made from bamboo waste, NPK phonska fertilizer (15-15-15), and pesticide (Matador and Confidor 5Wp), while the tools used are hand tractor, hoe, shovels, rakes, machetes, scales, gauges, raffia straps and stationery
Summary
Corn (Zea mays L.) has an important role in the fulfillment of food for some people. Corn, as one of the food crops in Indonesia, ranks second after rice. Several research results of biochar dosage and NPK fertilizers give various effect on the corn plant. Research result of [3] shows that the utilization of bamboo waste biochar dose of 10 t ha-1 gives a real effect to the height of the plant and total fresh weight of corn plant. While [4], with a dose of 15 t ha-1 yielding fresh weight of 100 high corn seeds. Biochar dosing of 10 t ha-1 and phonska dose of 300 kg ha-1 can increase the growth of maize plants [6] and yield of Bisi-2 hybrid corn [7], [8]. Combination of dosage of biochar 10.52 t ha-1 with compost dose 20.22 t ha-1 and NPK phonska 313.37
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