Effect of Different Sowing Dates in South Henan's Rice-growing Areas on the Growth and Yield of Ratoon Rice

In order to determine the optimal sowing date of ratoon rice in South Henan's rice-growing areas, this paper performs a comparative analysis of rice growth process, seedling quality and yield of first season rice and ratoon rice under different sowing date treatments. The results show that under climatic conditions (2014), by using dry seedling cultivation in a small plastic shed, the growth of seedling sown on February 21 was affected, while the sowing treatments from March 1 to April 11 can breed normal seedlings, and in this period, the maturity period of first season rice was delayed with prolonged sowing date, and ratoon rice yield declined with prolonged sowing date (total production of rice sown on 11 March reaching a peak). Thus, it is considered that the optimal sowing date of ratoon rice in South Henan's rice-growing areas is mid-March.