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全省品种区划从1978年开始,1981年正式实施。按照省区划,我县位处第Ⅱ、Ⅲ、Ⅳ积温带。若按照积温要求,各积温带的品种选择,只能控制在80%保证率范围之内。然而,从八十年代中期开始,本县各积温区之间种植的作物(除玉米)品种没有大的差异,其品种所要求的积温数量已经超过了本积温带≥10℃活动积温80%保证率的值限,并连年取得了很好的效益。例如,大豆合丰25号,需积温2420℃,已经种到了第Ⅳ积温带;吉5412大豆需积温2500℃以上,在第Ⅲ积温带,已有五年的生产历史。那么,积温是否增高,需要从历史上考察本地积温状况。 1 积温情况分析 1.1 ≥10℃活动积温的表现分析根据四十年的气象资料分析,虎林县≥10℃活动积温多年变幅为2387.9～2491.8℃,≥10℃的积温始期平均在5月11～5月14日、终止期平均在9月26日～9月29日,持续日数136～140天。多年的资料表明,≥10℃活动积温年际间平
The province’s regionalization began in 1978 and was formally implemented in 1981. In accordance with the provincial division, my county is located in Ⅱ, Ⅲ, Ⅳ accumulated temperature zone. In accordance with the requirements of accumulated temperature, the temperature of the variety of products, can only be controlled within the scope of the 80% guarantee rate. However, since the mid-1980s, no significant differences were found in the varieties of crops (except maize) planted between the accumulative temperature zones in this county. The accumulated accumulated temperature required for the varieties exceeded the accumulative temperature of ≥10 ℃ and the active accumulated temperature of 80% The rate limit, and has achieved good results year after year. For example, Soybean Hefeng No. 25, with an accumulated temperature of 2420 ℃, has been planted with the fourth accumulated temperature zone. Ji 5412 soybean needs an accumulated temperature of 2500 ℃ or more. In the third accumulated temperature zone, it has five years of production history. So, whether the accumulated temperature increases, the need to historically examine the local temperature conditions. 1 Analysis of accumulated temperature 1.1 Analysis of active accumulated temperature of ≥10 ℃ According to the analysis of four decades of meteorological data, the accumulated accumulated temperature of ≥10 ℃ in Hulin County fluctuated from 2387.9 to 2491.8 ℃ for many years, and the average initial accumulated temperature of ≥10 ℃ was on May 11 ~ May 14, the termination of an average of September 26 to September 29, the number of days for 136 to 140 days. Years of data show that ≥ 10 ℃ activity accumulated between years flat