Present status of rice cultivation under environmentally friendly farming system at Iriomote Island of Taketomi town in Okinawa prefecture [Japan]
2000
Katano, M. (Kyushu Tokai Univ., Choyo, Kumamoto (Japan). Faculty of Agriculture) | Koga, R. | Nakazato, N.
Growth, yield, Mg and K content in brown rice and root growth of rice cv. Chiyonishiki, Taiko and Kokushimai grown in the farmers' paddy fields as the first cropping season under environmentally friendly or organic farming system at Iriomote island in Okimawa prefecture. Yield of Chiyonishiki and Taiko were much higher than the mean value at Taketomi town and Okinawa prefecture. Mg/K chemical equivalent ratio representing as an eating quality of Chiyonishiki and Taiko were higher and almost the same value as popular cultivars in temperate area in Japan. On the other hand, yield of Kokushimai with long glutinous grain, purple anthocyan pigment in the grain, easy shattering habit and being susceptible to lodging was relatively lower than the average level and Mg/K value was much lower than those in Japonica rice. The root system of Taiko had more vigorous and seemed to be suitable for organic farming system. Adventitious roots with injured tip growth and much thick lateral roots could be seen ranging from 6% to 19% among growing adventitious roots with no regard to cultivars and farming systems
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