上海郊区粮食一年三熟栽培,往往由于年际气候条件的变化不定,产量不稳。主要问题是三熟作物季节紧,尤其是后季稻遇秋季低温危害,影响稳产高产。因此,如何合理利用本市气候资源趋利避害,是争取粮食稳产高产的重要课题。作物生育必需有适宜的温度才能活跃地进行各项生理活动。因此,上海郊区热量条件的多少,是粮食一年三熟种植制度区划的重要依据之一。 Shanghai suburban grain cultivation three times a year, often due to uncertainties in the inter-year climatic conditions, the output is not stable. The main problem is the seasonally tight crop of three crops, especially the late rice fall season when the impact of low temperature, affecting stable and high yield. Therefore, how to make rational use of the city’s climatic resources to reduce profits and avoid disadvantages is an important issue to strive for a steady and high yield of grain. Crops must have adequate temperature to actively carry out various physiological activities. Therefore, the quantity of heat in the suburbs of Shanghai is one of the important bases for the division of the three-year cropping system in grain.