Evaluation of quantity yield, harvest index and phonological traits of ratooning crop

In order to evaluation of quantity yield, harvest index and phonological traits of ratooning crop in two rice under agro systems at the north of Iran, an experiment was carried out as split plot in randomized complete blocks design based four replications at Neka, Mazandaran, Iran in 2011 and 2012. Planting systems were chosen as main plots (Conventional, Improved and SRI or System of Rice Intensification) and genotypes as sub plots (Tall plant: Sang Tarom and Hashemi Tarom; Short plant: Neda and Shiroodi). The results showed that the least days number to initial heading, days number to 50% flowering 40.5 days were obtained in SRI. The minimum days number to physiological maturity was observed in SRI and improved system, but the highest grain yield and harvest index had produced in SRI and improved system. Grain yield in var. Tarom Hashemi was in ratio 7.53% more than var. Sang Tarom. But, harvest index for var. Tarom Hashemi more than var. Sang Tarom. At interaction of year × cropping system was notice that the most grain yield was produced at interaction of first year in SRI and improved system. At interaction of year × cultivar observed The maximum grain yield was obtained at interaction of first and second year × var. Tarom Hashemi. Therfore, SRI was the soutable for ratooning harvesting in this location

Cropping system, Grain yield, Growth period, Ratooning, Rice.