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一、郊区三熟制评价一个地区熟制的组成,主要取决于当地的热量与大气的湿润度,同时还要结合社会经济条件和农业科学技术水平。由于各气候带热量条件很不相同,因而农作物熟制和组成,相应有很大的变化。按常规来说,寒温带、温带一般一年一熟,暖温带两年三熟,北亚热带一年两熟,南亚热带、热带、赤道带一年三熟。这仅仅是一个概括性的划分,即使在同一地带中,由于受当地的地貌、生态条件、地面高程等因素的制约,也会引起热量和湿润度发生局部的差异,影响熟制的变化。上海地区处于北亚热带南缘,是东亚季风盛行地区。温暖湿润,光照充足,作物生长季节较长,气候条件较好。年平均无霜期225～235天,日平均气温高于10℃的作物生长期,
First, the suburbs of three cooked system Evaluation of a region cooked system, mainly depends on the local heat and the humidity of the atmosphere, but also with the socio-economic conditions and agricultural science and technology. Due to the very different heat conditions in different climatic zones, crop ripening and composition have correspondingly changed a lot. As a general rule, cold temperate, temperate one year generally cooked, warm temperate two years three ripening, the North subtropical two ripening year, South Asia tropical, tropical, equatorial three times a year. This is only a general division, even in the same zone, due to local topography, ecological conditions, surface elevation and other factors, will also cause local differences in calories and moisture, affect the cooked changes. Shanghai is located in the southern margin of the North Subtropics and is a prevalent area of East Asian monsoon. Warm and moist, adequate light, longer crop growth season, better climatic conditions. The average annual frost-free period 225 ~ 235 days, the average daily temperature is higher than 10 ℃ crop growth period,