ผลของความเข้มข้นของปุ๋ยโพแทสเซียมต่อคุณสมบัติทางทางเคมีของข้าวพันธุ์ดอกพะยอม ((Oryza sativa L. var. Dokpayom) EFFECTS OF POTASSIUM FERTILIZER CONCENTRATIONS ON CHEMICAL PROPERTIES OF Oryza sativa L. var. Dokpayom)

Abstract

This study was objected on the effects of Potassium fertilizer concentrations on physical and chemical properties of Oryza sativa L. var. Dokpayom. Soil from the paddy at the Phatthalung Rice Research Center Kuan-ma-praw District, Phatthalung Province was showed the soil acidity at pH 3.52, high organic matter at 2.74%, available high phosphorus at 18.90 ppm and available low potassium at 27.25 ppm. The results of analysis were calculated fertilizer according to the analysis of soil. At 25 days of rice germination, the chemical fertilizer of 3-0-6 formula was fed to the field by the calculation of soil analysis. The formula fertilizers were designed at 46-0-0 (7 kg/field) of Urea and 0-0-60 (10 kg/field) of Potassium Chloride (concentration rates at 0, 82.88, 165.75 and 331.5 g K₂O /field: equivalent 0, 25, 50 and 100 kg K₂O/ field, respectively). Samples of rice grains assessment at 10 days showed 92% germination. Concentration rates of Potassium Chloride fertilizer at 0 and 82.88 g K₂O /field resulted to moderate amylose contents of grains, loosely cooked rice and medium of gel consistency. High concentrations of Potassium Chloride fertilizer formula at 165.75 and 331.5 g K₂O / field contained of high amylose grain, solid of gel consistency, alkali spreading value of 5 and elongation ratio of unriped and cooked rices as 1.44 to 1.55 mm. In conclusion, the best concentration rate of Potassium Chloride to the chemical properties of grains was 82.88 K₂O/field (equivalent of 25 kg K₂O/ field) comparing with other samples at the same paddy field of significant level (p≤0.05, n=3).