What is the difference between early rice and late rice?

Early rice: Southern indica rice with early cultivation time and early maturity, which is different from middle rice and late rice in different seasons.

Late rice: rice with late transplanting or maturity.

First, the photosensitivity is different

Late rice: The vegetative growth period is the longest (74.2 days), and the basic vegetative growth period is the shortest, and the basic vegetative growth period is also smaller because of its strong photosensitivity.

Early rice: The vegetative growth period shortened by short sunshine and high temperature is the shortest (23 days), but the vegetative growth is slightly larger than that of late rice.

Second, temperature sensitivity is different.

The upper limit temperature of rice growth is generally 40℃, but the upper limit temperature of rice development will not exceed 28℃. Late rice is more sensitive to temperature than early rice.

Third, the harvest time is different.

The growth period of one-season rice sown in early May is generally between 140- 160 days, and the harvesting time should be in the middle of 10. In areas where crops are harvested twice a year, early rice is usually harvested in late July.

Late rice is usually harvested in the middle and late June of 65438+ 10, and the growth period of varieties is different; As for Hainan in three seasons of the year.

Extended data:

At present, the distribution area of rice planting in China is mainly in the south, and rice production is increasingly concentrated in advantageous areas. In recent years, China's rice production has gradually concentrated in the middle and lower reaches of the Yangtze River and Heilongjiang rice producing areas. At present, the rice planting area in the south accounts for about 94% of China's rice planting area, including 65.7% in the Yangtze River valley and 6% in the north. Take 2005 as an example, Hunan, Jiangxi, Guangxi, Guangdong, Sichuan, Anhui, Jiangsu, Hubei, Zhejiang, Fujian, Yunnan and other provinces (regions) with large rice planting area and output have 12, accounting for about 85% of the country.

There are 13 provinces producing early rice, all of which are distributed in the south, among which Hunan, Guangxi, Jiangxi and Guangdong account for more than 75% of the national sown area. Mid-season rice and one-season rice production are distributed all over the country except Guangdong, Hainan and Qingdao, among which eight provinces (cities) such as Sichuan, Jiangsu, Heilongjiang, Anhui, Hubei, Yunnan, Hunan and Chongqing account for more than 70% of the country's sown area. Late rice production is distributed in southern 15 provinces, which is similar to early rice.

Baidu encyclopedia-early rice

Baidu encyclopedia-late rice