Lodging related traits and yield of rice as affected by time of paclobutrazol application
1988
Lee, S.K. | Kim, T.J. (Yeongnam Univ., Kyonsan (Korea R.). Coll. of Agriculture)
An experiment was carried out to know the effect of paclobutrazol application time on the lodging related traits and yield of a rice variety, Seomjinbyeo, at two nitrogen levels. Paclobutrazol (3kg/10a of 0.6% G) was applied 43, 33, 23, and 13 days before heading DBH and lodging related traits were observed 10, 20, 30, and 40 days after heading DAH. Earlier applications of paclobutrazol reduced the length of lower internodes and later applications reduced the upper internodes. Culm length tended to decrease as time of paclobutrazol application delayed. Although lodging did not occur in all plots, lodging index of paclobutrazol treated plots was lower than that of control and increased with maturity. Fresh weight of shoot increased up to 30 DAH and then decreased. Both fresh weight and breaking strength did not show consistent tendency with time of paclobutrazol application and observation. Direct effect of shoot fresh weight contributing to lodging index decreased with maturity, but that of breaking strength and culm length was similar during the ripening stages. Direct effect contributing to lodging index was greater in the order of breaking strength culm length, and fresh weight 40 DAH. Strach content of culm base decreased up to 20 DAH and then increased up to 40 DAH. Cellulose content increased up to 20 DAH, but hemicellulose and lignin did not change significantly during the ripening stages. Starch, cellulose, hemicellulose, and lignin contents of culm base were not correlated with breaking strength and time of paclobutrazol application did not show consistent results. Paclobutrazol applied 13 DBH did not reduce yield of rice, but the earlier applications reduced yield due to a reduced number of spikelets per panicle
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