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Determination of Optimum and Maximum potassium fertilizer rate for Hybrid rice production in lowland ecosystem [manuscript]
(2020) Sarah Mae J. Javillonar
The study attempts to determine the optimum and maximum rate of potassium fertilizer for hybrid rice production as of 2019. The optimum rate of potassium fertilizer was 2.67 kg and the maximum level of potassium was 2.68 kg this result may seem to be very low considering that the recommended rate of potassium in most hybrid rice technologies is around 60-90 kg K/ha. It was tested using randomized Complete Block Design with three replications and five treatments. The treatments were T1 Control (150-60-0 kg N-Phosphorus-Potassium/ha), T2 (150-60-30 kg N-Phosphorus-Potassium/ha), T3 (150-60-60 kg N-Phosphorus-Potassium/ha), TT4 (150-60-90 kg N-Phosphorus-Potassium/ha), T5 ( 150-60-120 kg N-Phosphorus-Potassium/ha). Application of increasing rates of potassium fertilizer did not improve the height, Number of tillers, percent filled grains, weight of 1000 grains, dry matter yield and grain yield of hybrid rice. Sample non-linear regression for the effect of K on rice resulted to a r2 value of 0.7745. This demonstrates that the change in yield is accounted for by the increase in the level of k fertilizer. This further shows the closeness of the observed values with the estimated values determined in the regression line. The maximum level K is 2.68 kg/ha which result to a yield of 7,409 kg/ha.