Rice residual management on ratoon yield and agronomical characteristics in rice varieties in Amol, Iran

In order to evaluate the rice residual management on ratoon yield and agronomical characteristics in rice varieties، an experiment was carried out in 2007. The experimental design was a split plot based on a randomized complete block with four replications. Main plots was four varieties including Tarom Mahalli، Tarom Langrodi، Tarom Hashemi and Tarom Dylamani and three residual management including ground cutting، standing (cutting at 40 cm height) and lodging stubble (cutting at 40 cm height) as sub plots. Results showed that the highest plant height، panicle length، number of tiller per hill، panicle per m2 and grain yield was obtained in the Tarom Mahalli. The reason of highest grain yield in this variety were the increasing panicle length، number of tiller per hill and panicle per m2. The greatest number of spikelet per panicle was obtained on Tarom Hashemi. The lodging stubble method had the highest panicle length، 1000 grain weight and stubble yield. The greatest flag leaf length and fertile tiller percentage were observed in the ground cutting method. The number of spikelet per panicle had positive correlation with grain yield and the grain yield had negative correlation with tiller number at α=%1 level of probability. Therefore Tarom Mahalli variety and lodging stubble method introduced for ratooning harvest.