Moisture reduction of paddy before harvesting using ripening regulator
2002
Chompunut Wararaj(Chiang Mai University, Chiang Mai (Thailand). Postharvest Technology Institute) | Supasark Limpiti(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture) | Songchao Insomphun(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture)
Though rice combine harvester could reduce the problem of labor shortage during harvest season but the high crop moisture content at harvesting and threshing render a high loss and cracking of the paddy. Furthermore large amount of the outcome wet paddy from the combine must be dried soon before deterioration occurs. The objectives of this work were to study the paddy moisture reduction before harvesting by using ripening regulator (dimethipin) and to find its effect on harvesting loss and milling quality. The experiment was laid out in Factorial in RCB design. The treatments were two harvesting methods (manual and combine harvesting) and three spraying periods (no spraying, spraying at physiological maturity (PM), and spraying at 4 days after PM). Data collected were percentage of paddy moisture content, harvesting loss and yield, and milling quality of rice. Results showed that the non spraying method reduced moisture content of paddy at PM from 30.7 percent (wb) to 16.4 percent in 11 days. Spraying dimethipin at PM and 4 days after PM lessened the paddy moisture from 31.8-32.6 percent to about 16 percent in 4 and 8 days respectively. Therefore, not only harvesting could begin 3-7 days earlier, but moisture content of the paddy was also much lower than the non spraying crop. Manual harvesting with spraying at 4 days after PM gave the maximum yield of 446.1 kg/rai, and the minimum loss of 5 kg/rai (1.13 percent). The yield of paddy obtained from combine harvesting with spraying at 4 days after PM and 432 kg/rai, while harvesting loss was 8.1 kg/rai (1.87 percent) The best milling quality in term of head rice percentage of the 2 harvesting methods (manual and combine harvester) with spraying at 4 days after PM were 80.3 and 75.9 percent, respectively.
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