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西瓜(Citrullus vulgaris)味甜、汁多、含有丰富的丙种维生素及糖份,是夏天的重要水果之一。它原产于热带沙漠地区,喜高温干燥及充足的阳光。生育期间要求高温,在30℃的温度下,同化作用最盛;40℃时仍能维持较强的同化作用。高温、强日照是西瓜高产优质的主要气候因子。因此,我国华北、西北所产的西瓜产量高,品质好。长江流域虽然
Watermelon (Citrullus vulgaris) sweet, juicy, rich in vitamin C and sugar, is one of the important fruits of summer. It is native to tropical deserts and enjoys hi-temperature, dryness and plenty of sunshine. High temperature is required during the growth period, and the assimilation effect is the highest at the temperature of 30 ° C; strong assimilation can still be maintained at 40 ° C. High temperature, strong sunlight is the main climate factor of high yield and quality of watermelon. Therefore, the yield of watermelon produced in North China and Northwest China is high and the quality is good. Although the Yangtze River valley