Chitosan is a natural polymer extracted from chitin. It can be applied to plants in order to
increase yield. The aims of this study were to determine the effective type of chitosan and the appropriate
method for increasing rice yield. The experimental design was 3 ¥ 3 factorial in RCB with one control
and replicated four times. The factor A was seed soaking, seed soaking + foliar spraying and foliar
spray; the factor B was polymeric chitosan, oligomeric chitosan and monomeric chitosan. The mixed
chemical fertilizer between 46-0-0 and 16-20-0 ( ratio 1:1w/w) at the rate of 50 kg/rai was applied to the
rice plants of all treatments, but without chitosan in the control treatment. This study was conducted in
pot experiment in a greenhouse at Rajamangala University of Technology Suvarnabhumi during January
to April 2005. The results indicated that application of polymeric chitosan by seed soaking before planting
followed by four foliar sprayings throughout cropping season significantly increased (P<0.05) the tiller
numbers per plant and dry matter accumulation but decreased unfilled grains. However, the application
of chitosan with different molecular weights and different application methods did not affect plant
height, thousand-grain weight and filled grains. Focusing on the rice yield, there was a tendency to
achieve higher yield when polymeric chitosan was applied by seed soaking before planting followed by
foliar spraying but it did not show any significant difference from the other treatments.
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