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山东地瓜栽培面积较大,素有高产作物之称。按山东的气象条件一般是适于地瓜种植的,无霜期170—180天。断霜以后,日平均温度可达15℃以上,能保证栽苗成活,随着温度的增高,有利于长蔓结瓜;入夏以后,温度上升,茎叶生长较快,而伏季高温、多雨、土壤水分充足,茎叶和瓜块生长更为迅速;秋季雨少、天气晴朗,温度逐渐降低,日夜温差较大,对茎叶生长有所抑制,而对瓜块的生长极为有利。当然,本省春旱、夏涝,秋季又旱的气象特点,也是经常影响地瓜生长的不利因素。丘陵山区土层浅土质薄,平原地区常有涝渍之灾,也都影响了地瓜生长。几年来,我省农业生产在党的正确领导下,以毛
Shandong sweet potato cultivation larger, known as high-yield crops. According to the weather conditions in Shandong are generally suitable for planting sweet potatoes, frost-free period of 170-180 days. After the frosted, the average daily temperature of up to 15 ℃, can ensure the survival of planted seedlings, with the increase of temperature, is conducive to the long-winged Guadu; into the summer, the temperature rises, stems and leaves grow faster, Rainy, sufficient soil moisture, stems and leaves and melon growth more rapidly; less rainfall in autumn, the weather is sunny, the temperature gradually decreased, the larger the temperature difference between day and night, inhibited the growth of stems and leaves, while the growth of melon pieces is extremely beneficial. Of course, the province’s spring drought, summer floods, autumn and dry meteorological characteristics, but also often affect the growth of sweet potatoes unfavorable factors. Hilly mountainous soil is shallow, plain waterlogging disaster often affected the growth of sweet potato. In recent years, our province’s agricultural production under the correct leadership of the party, with Mao