Abstract :
The purpose of this research was to study ofoptimum NPK coated Humic
that can increase P Nutrient availability on vertisol, chili?s growth and
production . The research wasdesigned in Factorial Randomized Block Design
(RBD) with three replications. The first factor was compotition of NPK Grade
with 3 level: 15:15:15 (P1), 20:10:15 (P2), and 20:20:15 (P3). The second factor
was humic acid persentage with 6 level: 0% (A0), 1% (A1), 2% (A2), 3% (A3), 4%
(A4), dan 5% (A5).The parameters were observed included P Nutrient Availability
on soil, pH, EC, P Nutrient availability on plant, amount fruit/plant. The result
showed that compotition grade NPK 20:10:15 and 3 % humic acid were
increased P nutrient availability on soil and increased production result on chili
Keyword :Vertisol, NPK Grade, Humic Acid, P Nutrient Availability, and
Production