Growth and yield response of virgin cane, K95-84 variety, to potassium chloride and potassium thiosulfate
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Abstract
Field experiment was conducted in a farmer field at Ban Chong Dan, Chong Dan subdistrict, Bor Ploy district, Kanchanaburi province to investigate growth and yield response of sugarcane, K95-84 variety, in Kamphaengsaen soil series foliar application of potassium thiosulfate. The experiment was arranged in Randomized Complete Block design (RCBD) with four replications. There were nine treatment, comprising three rates, 2.5, 5.0 and 7.5 kg/rai of K2O,of potassium application of which treatments 1-3 (T1-T3) were topdressing of potassium chloride, treatments 4-6 (T4-T6) were foliar application of potassium chloride, and treatments 7-9 (T7-T9) were foliar application of potassium of potassium thiosulfate, respectively. Fertilization was undertaken when sugarcane was at 3-month after planting. Sugarcane yield and its components were harvested and measured when the plant was 12 months old. Results showed that foliar application of potassium thiosulfate at the rate of 7.5 kg/rai of K2O (T9) significantly gave the highest fresh cane yield and aboveground biomass of 21.46 and 26.10 t/rai, respectively, followed by foliar application of potassium chloride at the rate of 5.0 kg/rai of K2O (T5) that gave these yields of 17.56 and 23.79 t/rai whereas topdressing of potassium chloride at all rates gave the lowest cane yield and aboveground biomass. In addition, foliar application of potassium thiosulfate highly significantly induced the highest sulfur uptake of 37.48 kg/rai in the top part of sugarcane which was consistent with the greatest cane yield obtained.
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