Variety Screening of the Early-mature Rice and Ratooning Rice with Low Stubble Harvested by Machine and Its Regeneration Capacity Evaluation

In order to screen out the new varieties of ratooning rice with low stubble harvested by machine which were suitable for the model of early-mature rice and ratooning rice, the rice varieties such as Zhongzheyou No.8 were used as the experimental materials, and the growth period, yield, disease resistance and lodging resistance of various rice varieties were investigated comprehensively by using the single factor randomized block design. The results showed that Zhongzheyou No.8 had the highest total yield of two crops with 15281.11 kg·hm^-2, with good resistance and moderate growth period, which could be promoted to be planted in the low altitude areas of the south of Yongding District. The total yield of two crops of Zhongzheyou H7 was the second with 15149.93 kg·hm^-2, with long growth period and weak disease resistance, which was suggested to be planted properly in the low altitude areas of the south of Yongding District where the rice blast and false smut occurred lightly. The total yields of two crops of Jingliangyou Huazhan and Longliangyou 534 were 14620.07 kg·hm^-2 and 14602.07 kg·hm^-2, respectively, with moderate growth period and good resistance, which could be widely planted in the low altitude areas of the south of Yongding District. The total yield of two crops of Yexiangyou 699 was 13688.96 kg·hm^-2, with long growth period and weak resistance to false smut, which was suggested to be promoted cautiously. The total yield of two crops of Chuanzhongyou 3877 was 13601.50 kg·hm^-2, with relatively average yield, but the growth period was significantly shorter than that of other tested varieties, and the resistance was good. Compared with other tested varieties, there was wider suitable area for Chuanzhongyou 3877 to be planted as the ratooning rice with low stubble harvested by machine, so it could be extended appropriately. Yexiangyou 6813 had higher yields of ratooning rice, with low total yield of two crops and weak resistance to rice smut. The total yield of two crops of Tailiangyou 217, Jingliangyou 1212 and Changliangyou No.8 were low. Therefore, these four varieties were not recommended to be planted in Longyan as the ratooning rice with low stubble harvested by machine.