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我市总面积为20856003.2亩,其中耕地面积970万亩,平均含有机质1.23％,全氮0.073％,全磷0.048％。在耕地面积中盐碱地占180万亩,含有机质0.21—1.5％,全氮0.013—0.055％,全磷0.02—0.1％;沙土地165万亩,平均含有机质0.72％,全氮0.043％速效磷4.1ppm。从以上化验结果说明,我市耕地大部分少氮、缺磷,有机质中下。土壤是自然资源,是人类赖以生存的重要生产资料,合理利用土壤不仅可使作物增产,而且可使土壤本身不断更新。相反如果只种不养,采取掠夺式生产方式,则地力势
The total area of our city is 20856003.2 mu, of which 970 mu is cultivated land, with an average of 1.23% organic matter, 0.073% total nitrogen and 0.048% total phosphorus. In the arable land, the area of arable land accounts for 1.8 million mu, including 0.21-1.5% of organic matter, 0.013-0.055% of total nitrogen and 0.02-0.1% of total phosphorus; 165 mu of sandy land, with an average of 0.72% of organic matter and 0.043% ppm. From the above laboratory results show that most of the city’s cultivated land less nitrogen, phosphorus, organic matter in the next. Soil is a natural resource, which is an important means of production for human beings. Rational use of soil can not only increase crops, but also make the soil itself continuously updated. On the contrary, if you do not breed only and take a predatory mode of production, then the earthpower potential