Lodging resistance and agro-morphological characteristics of Elon-elon and Palawan red sprayed with paclobutrazol
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Abstract
An experiment was conducted during the wet season of 2010 to determine the effects of paclobutrazol on the lodging resistance, agro-morphological characteristics and yield performance of Elon-elon and Palawan red. Paclobutrazol was effective in shortening the length of the lower internodes which resulted to shorter plants but with increased lodging resistance. There was a reduction of 12.42 % on culm length and 9.59 % on plant height of the two varieties sprayed at 1000 ppm compared to the untreated plants. Lodging resistance increased with increased concentration of paclobutrazol and lodging index was described by the equation Y = -0.007x + 7.234. At all concentrations of paclobutrazol, Palawan red had the longest first and fourth internodes, heavier 1000 grain weight and higher leaf area index but with more unfilled grains per panicle than Elon-elon. On the other hand, smaller stem diameter, more productive tillers per hill and longer panicle length were obtained from Elon-elon than Palawan red. Application of increasing concentrations of paclobutrazol did not affect the chlorophyll contents of the leaves at 15, 30 and 50 DAFS. The percentage filled grains/panicle, number of spikelets/panicle, weight of 1000 grains, dry matter yield, harvest index and grain yield were likewise unaffected owing to lodging at later stages of rice maturity.
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References
Berry, P. M., Sterling, M., Spink, J., Baker, C. J., Sylvester-Bradley, R., Mooney, S. J., Tams, A. R. and Ennos, R. (2004). Understanding and reducing lodging in cereals. Advances in Agronomy 84:217-271.
Canare, J. JR. G. (1998). Fertilizer management of upland rice (Oryza sativa L.) grown on lahar deposit. (Doctor of Philosophy’s Thesis). Central Luzon State University.
Gomez, K. A. (1988). Techniques for Field Experiments with Rice. Laguna, Philippines: International Rice Research Institute.
Fang, T. and Zhao, W. (2005). Chemical control of the overgrowing seedlings in the continuous cropping of late rice. Effect of MET on the growth and tillering of rice seedling and the yield of rice grain. Retrieved from http://en.cnki.com.cn/Articleen/CJFDTOTAL-XBZW198802000.htm.
Im, I. B., Lee, S. Y. and Lim, M. S. (1987). Growth and lodging of paddy rice as affected by paclobutrazol application under the different level of nitrogen fertilizer. Korean Journal of Weed Science 7:171-178.
IRTP (1988). Standard Evaluation System for Rice. 3rd Edition, Los Banos, Philippines: International Rice Research Institute.
Street, J. E., Jordan, J. H., Ebelhar, M. W. and Boykin, D. L. (1986). Plant Height and Yield Responses of Rice to Paclobutrazol. American Society of Agronomy. Journal of Natural Resources and Life Sciences Education. Retrieved from http://scidirect.com.
Ueno, H., French, P., Kohli, A. and Matsuyuki, H. (1987). Paclobutrazol: control of lodging of rice in Japan. Proceedings of the 11th International Congress of Plant Protection, Manila, 1987, ed. by E. D. Magallona 1:1440-444.
Ueno, H. and Kohli, A. (1994). Paclobutrazol: Control of Rice Lodging in Japan. Paper presented at the 1987 British Crop Protection Conference - Weeds and the 11th International Congress of Plant Protection. pp. 109-118.
Wang, X. I. (1991). Effects of MET on IAA-oxidase and endogenous IAA in Rice. Acta Agricultural University Zhejiangensis 17:60-64.
Yoshida, S. (1981). Fundamentals of Rice Crop Science. Los Banos Laguna, Philippines: International Rice Research Institute.