Responses of Khao Dawk Mali 105 Rice to Zinc and Copper Fertilizers in Different Paddy Soils
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Abstract
Representative paddy soils in Thung Kula Ronghai, namely, Tha Tum, Roi-et and Ubon soils series were selected for greenhouse study on the response of Khao Dawk Mali 105 (KDML 105) rice to different rates of zinc (Zn) (0, 0.5, 1, 2 and 4 mg / kg of Zn) and copper (Cu) (0, 0.3, 0.6, 1.2 and 2.4 mg / kg of Cu). Results revealed that the application of Zn or Cu had no effect on straw dry weight and grain weight. Zinc significantly stimulated panicle initiation and rice height of which the addition of Zn at all rates increased plant height in Ubon soil series and the greatest height was from the pot added with 1 mg / kg of Zn while the rates of 2 and 4 mg / kg induced similar result in Roi-et soil series (162 - 165 cm). In these two soils, the rice initiated the panicle earliest only 79.3 and 83.7 days after transplanting when applied with 4 mg / kg. Copper decreased plant height except in Tha Tum soil series that all rates of applied Cu, with the exception of 1.2 mg / kg of Cu, similarly promoted the values of plant height (162 - 167 cm) and number of filled-grain (76.3 - 80.0 %). Moreover, Cu applied at rate 2.4 mg / kg significantly increased number of filled-grain in Ubon soil series (81.7 %) which increased the panicle number of rice in Roi-et soil series similarly to that applied with the rate of 0.3 mg / kg (12.33 - 11.30 panicle / pot).
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References
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