The increased yield of rice due application of high-potassium-NPK fertilizer to low-potassium-soil content

Abstract

The research aims to observe the optimal dose of 15-10-18 NPK fertilizer in rice growth and yields. This research is arranged in a Randomized Block Design with 4 replications. Treatment consists of 8 combinations of fertilizing which resulted in 32 treatments of 4x6 m2 plot-1. The types of treatment studied are as follow: (A) Treatment with no fertilizer as control plot; (B) Treatment with recommendation dose of 200 kg ha-1 Urea and 300 kg ha-1 15-15-15 NPK; (C) Fertilizer dose of 200 kg ha-115-10-18 NPK; (D) Fertilizer dose of 300 kg ha-1 15-10- 18NPK; (E) Fertilizer dose of 400 kg ha-115-10-18NPK; (F) Fertilizer dose of 200 kg ha-1 Urea and 200 kg ha-115-10-18 NPK; (G) Fertilizer dose of 200 kg ha-1Urea and 300 kg ha-115-10-18 NPK; (H) Fertilizer dose of 200 kg ha-1Urea and 400 kg ha-1 15-10-18 NPK. Characters observed are as follows plant height, the amount of productive tiller, panicle height, unfilled grains percentage, the weight of 1,000 grain, and yields. The result showed that those treatments are significantly different in terms of plant height, the amount of productive tiller, unfilled grains percentage, the weight of 1,000 grains, and yields, but those treatments are not significantly different in panicle height. The highest R/C Ratio on F treatment (200 kg ha-1 15-10-18 NPK and 200 kg ha-1 urea) reaches 3.18 and B/C Ratio 2.18 (income value IDR 27.966.000) with yields 7,63 ton ha-1. It means that the high-potassium fertilizer of 200 kg ha-1 15-10-18 NPK and 200 kg ha-1 urea is an optimal dosage to low-potassium-soil content.