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我市郊区常年蔬菜面积1万8千余亩(不包括水生蔬菜),通过土壤普查,总的肥力状况是有机质含量2.3—3.0%,全氮0.12—0.18%,速效磷14.2—33.5ppm,速效钾79—105ppm,供氮强度10,供磷强度1.6左右,属于中上级肥力水平。但受栽培历史、耕作技术、管理水平等方面的影响,致田块间的土壤养分含量差异很大。据调查,有效磷低于20ppm的5654亩,占常年菜田的35%,有效钾低于80ppm的1960亩,占12%,pH5以下的强酸性土壤2780亩,占17%。这些土壤,均不利于蔬菜生长,在“边查、边试、边用”,尽快地把土壤普查成果转化为生产力的要求下,1982年进行了施磷、施钾、施石灰多点小区试验及生产性试
In the suburbs of our city, the perennial vegetable area is more than 18,000 mu (excluding aquatic vegetables). According to the soil survey, the total fertility is 2.3-3.0% of organic matter, 0.12-0.18% of total nitrogen, 14.2-33.5ppm of available phosphorus, Potassium 79-105ppm, for nitrogen intensity of 10, for about 1.6 phosphorus, belonging to the level of fertility. However, due to cultivation history, farming techniques, management and other aspects of the impact, the soil nutrient content between fields caused by very different. According to the survey, 5654 mu of available phosphorus is less than 20ppm, accounting for 35% of perennial vegetable fields and 1960 mu of available potassium below 80ppm, accounting for 17% of 2780 mu of strong acidic soil with pH below 5. These soils are not conducive to the growth of vegetables. In 1982, under the request of “checking, testing and using,” the results of soil census were transformed into productive forces as soon as possible. In 1982, plots of phosphorus, potassium and lime plots were conducted And production test