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本市山丘地占地面积的70％以上,其中土层不足20厘米深的山区旱薄地约250万亩。目前甘薯又多分布在这些旱薄地上。其地块特点是:土层浅(土层以下多为铺板石或酥石硼),土质多为粗砾砂土,土壤贫瘠,再加上蓄水量少,形成典型的山区旱薄地,三伏天成为三日无雨小旱,五日无雨大旱的局面,因此产量低而不稳,常年甘薯产量徘徊在亩产1,500公斤左右。但通过综合技术的开发证明,这些山区旱薄地的甘薯产量也可以大幅度增产。经近三年的开发,面积为2万余亩,平均单产增加831.25公斤,为57.74％,总产增加4033.8万公斤,经济收入增加322.7万元。其中大幅度增产的技术措施主要有以下几个方面:
The city covers an area of more than 70% of the hills, of which less than 20 cm deep in the mountainous area of about 250 acres of dry land. Currently sweet potato and more distributed in these dry land. The characteristics of its land are: shallow soil (mostly below the soil layer of planktonic or borneol Boron), mostly of coarse gravel soil, poor soil, coupled with less water storage, the formation of a typical mountainous dry land, three V Tian became the third day without rain and drought, no rain on the 5th drought situation, low yield and instability, annual output of sweet potato hovering around 1,500 kg per mu. However, through the development of integrated technologies, the output of sweet and dry sweet potato in these mountainous areas can also be significantly increased. After nearly three years of development, with an area of more than 20,000 mu, the average yield increased 831.25 kilograms to 57.74%, total output increased 40.338 million kilograms, an increase of 3.227 million yuan in economic income. Among them, the technical measures for boosting production substantially include the following aspects: