The aplication of NPK compound fertilizer (15-15-6) on soil chemical properties and corn plant

Fertilization is a process to meet the amount of nutrient needs for plant to increase the production of plant yield. This means that the use of fertilizers and other inputs is important to have a high effectiveness in agricultural system. The purpose of this study was to determine the effect of inorganic fertilizer (NPK compound 15-15-6) on soil chemical properties and corn plant. The method used a Randomized Block Design (RBD) consisting of 10 treatment combinations (8 treatments of inorganic fertilizer doses (1/4, ½, ¾, 1, 11/4, 11/2, 13/4, and 2), 1 treatment dosage of NPK fertilizer recommendations and 1 control (without fertilizer). The results obtained were Application of inorganic fertilizer (15-15-6) give significant effects on N uptake, total N soil and yield of corn plant. All the treatments of inorganic fertilizer (15-15-6) can increase the parameter N uptake (9%-29.10%), N soil (4%-22%), weight of cover peel of cob (38%-90.82%), weight of cob (44%-85.33%), length of cob (10%-22%), and diameter of cob (17.08%-34.82%) compared with control. The application of inorganic fertilizers (15-15-6) at doses ¾, 1, 1 ¼ and 1¾ can significantly improve the yield of corn with the highest yield at NPK 1½ dose (15,850 kg/ha).