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农业是国民经济的基础,它作为一个社会生产部门,向来是人们生活生产资料的重要来源.目前,我国食物的百分之百,衣物原料的大部分都是来自农业.土地是农业的基本生产资料,因此,充分认识、利用和改造土地,是发展农业生产的前提和基础.土地是一个综合体,它不是单一的地貌,也不是单一的土壤,如四川的丘陵就不同于山东的丘陵,虽然它们同属丘陵地貌,在形态上相似,但处于不同的气候带,水热状况和地表组成
As a social production sector, agriculture has always been an important source of information on the means of production of people’s lives. Currently, most of the raw materials for clothing in our country come from agriculture, and the land is the basic means of production of agriculture. Therefore, It is not a single landform, nor is it a single soil. For example, the hills in Sichuan are different from the hills in Shandong, and although they belong to the same Hilly landforms are morphologically similar, but in different climatic zones, hydrothermal conditions and surface composition