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万荣县1979年引进地膜覆盖植棉技术,当年试验,第二年示范,第三年推广。1983年棉花地膜覆盖栽培面积达到7.5万亩,约占总棉田的1/3.本文试对万荣县五年不同气候条件下,地膜植棉的栽培技术及经济效益作一浅析。一、近五年与历年气候特点对比1.当地气候资源状况万荣县地下水和地上水都很贫乏,素有“干万荣”之称,年平均日照2,349小时,辐射热量为124千卡/厘米~2,年平均气温为11.8℃≥12℃的积温为3,898.9℃,无霜期180天左右,干燥度为1.2左右。根据我国气候干燥度的区划分级标准,本县属于半干旱类型农区。2.气候年型区分的方法用干燥度对某地常年气候特点进行干旱和湿润的分级,有一定的实用价值,仅用以
Wanrong County in 1979 to introduce plastic film mulching cotton technology, the test that year, the second year demonstration, the third year promotion. In 1983, the area covered by cotton mulch reached 75,000 mu, accounting for about 1/3 of the total cotton field.This paper tried to analyze the cultivation techniques and economic benefits of plastic film mulching under different climatic conditions in Wanrong County for five years. First, the past five years and the calendar year climate characteristics 1. Local climate resources Wanrong County groundwater and groundwater are poor, known as “Ganrong Rong,” said the average annual 2,349 hours of sunshine, radiant heat 124 kcal / cm ~ 2, the annual average temperature of 11.8 ℃ ≥12 ℃ accumulated temperature of 3,898.9 ℃, frost-free period of 180 days, the dryness of about 1.2. According to the division of the climate dryness grading standards, the county belongs to the semi-arid type of farming. 2. Method of year-type climatic distinction With the degree of dryness on a perennial climatic characteristics of drought and wet grading, have some practical value, only to