Effects of Sulfur Fertilizer on Grain Qualities of Khaw Dauk Mali-105 Rice

Abstract

Three experiments were conducted to examine effected to examine effects of sulfur (S) fertilizer on cooking and eating qualities of grains of Khaw Duak Mali-105 aromatic rice. The qualities were measured by sensory methods. The results led to the following conclusions and recommendations. 1) Application of S fertilizer to a soil deficient in S for rice plants resulted in increases in the aroma, softness, whiteness, stickiness and glassiness of boiled milled grains up to certain rates of application after which further increases in fertilizer resulted in decreases in the qualities, with the rates of S fertilizer that gave the highest qualities being variable among different qualities. 2) To obtain grains with highest aroma and stickiness, S fertilizer must be applied at the rate that were so much higher than the rate that began to produce the maximum paddy yield that paddy yield was reduced to 88% of the maximum. 3) To obtain grains with higher softness and glassiness, S fertilizer must be applied at the rate that began to produce paddy yield that was 96-98% of the maximum. 4) To obtain grains with high in all of the five aspects of quality, S fertilizer must be applied at the rate that began to produce the maximum paddy yield or that almost produces the maximum paddy yield. 5) Soils high in S are suitable for producing high quality grains of Khaw Duak Mali-105 aromatic rice.