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引言 耕地土壤肥力等级图是反映土壤肥力高低及其对施肥措施要求的一种图幅。它和深耕改土图、适宜种植图(县又叫农业区划图)一样是京郊各区(县〕、人民公社土壤普查中所普遍编制和应用最广的一种图幅。 土壤肥力高低直接影响农作物的产量,科学地把各种土壤肥力水平划分开来,将为高额丰产、因地制宜安排种植、合理施肥和分等用肥以及因地深耕改土打下基础,并为田地定产和农业税收以及实行农业四化(机械化、电气化、水利化、园田化)、推行三包制度提供依据。所以土地评级的实用意义和科学意义是显而易见的。
Introduction Cultivated soil fertility map is to reflect the level of soil fertility and fertilization measures required a map. It is the same as the planted soil improvement map and the planted planting map (the county is also called agriculture division map), which is the most widely compiled and applied map in the soil census of every commune in the suburbs of Beijing. The soil fertility has a direct effect Crop yield, the scientific separation of various soil fertility levels, will be high yield, according to local arrangements for planting, fertilizing and grading fertilization rationally and lay the groundwork for deep plowing and land improvement, and agricultural production and agricultural tax revenue As well as the implementation of the four modernizations of agriculture (mechanization, electrification, water conservancy and gardenation) and the implementation of the Three Guarantees system, so the practical and scientific significance of land rating is obvious.