India is rich in water resources with an annual rainfall of 3.93 trillion cubic meters. 36% of the country's regions have an average annual rainfall of over 1500mm, of which 33.5% have an average annual rainfall of 750- 1 150mm and 33.5% have an average annual rainfall of 750mm. There are many rivers in India. The Ganges is the most important river, with a total length of 2,700 kilometers, many tributaries 10, and a drainage area of10.06 million square kilometers.
Extended data
The main characteristics of rice climate are:
Rich in heat resources, suitable for the development of various rice planting systems, the national average temperature of rice growing period18 ~ 25℃; The average monthly temperature in the hottest rice areas in China is generally above 20℃, which is consistent with the period when rice needs high temperature. The accumulated temperature of > 10℃ in the rice planting area of Hainan Island is above 8000℃, and rice can be planted all year round.
The accumulated temperature from the south of the Yangtze River basin to South China > 10℃ reaches 5000 ~ 8000℃, and double cropping rice can be planted. The accumulated temperature from the north of the Yangtze River basin to North China > 10℃ is 4000 ~ 5000℃, which can be used for planting single-season mid-season rice. The accumulated temperature of > 10℃ in northeast and northwest rice areas is 2000 ~ 4000℃, which can be used for planting early rice.
Due to the control of subtropical high and the influence of the mainland, the summer temperature in rice-growing areas in China is higher than that in many parts of the world at the same latitude. The average temperature in Nanjing in July is 28.0 degrees Celsius (32 degrees 00 minutes north latitude). ?
Kagoshima (3134 ′ n) in Japan is 27.2℃; Jinan (36 42 ′ n) 28.2℃; Algiers (36 08 ′ n) is 24.8℃; Qiqihar (47 20 ′ n) is 22.0℃; Zurich (latitude 47 23' is 18.4℃. Superior heat conditions make the rice distribution in China farther north than other countries.