The effect of clipping portion of the rice panicles/ leaves as a method of inducing ratoonability in rice [Philippines]
1980
Samson, B.T. | Zandstra, H.G. | Mabbayad, B.B.
The sensitivity that ratooning showed to minor changes in harvest dates of the main crop and the response to lower temperatures led us to evaluate the effect of panicle and leaf clipping treatments to modify the source-sink ratio of the plant. In the 1979 wet season, clipping experiments at International Rice Research Institute (IRRI) using a randomized complete block design were done. Results showed that tillering increased from 10 to 14 per hill where half of each panicle was removed and reduced from 10 to 6 per hill where half of each leaf was removed. These effects were further confirmed in the following dry season trial, which also showed that late clipping of the panicles (at soft dough stage) may lessen the increase in ratooning. Plant analysis of the rice stubble (0 to 15 cm above ground level) and roots of the main crop at harvest showed that the number of ratoon tillers produced to significantly relate to percent carbohydrate (anhydroglucose) contents. These results indicate that ratooning ability is closely associated with the amount of carbohydrate left in the plant stubble at harvest.
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