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前言宁南山区属西北黄土高原,山大沟深,十年九旱,四料(饲料、燃料、肥料、木料)俱缺,是全国有名的“老少边”贫困地区。能否在占总耕地面积94%的旱地农业中,充分利用现有光、热、水资源,是一个值得重视的研究课题。为此,于1983—1986年通过在干旱,半干旱地区的3年定点裂区观测和一年大面积生产示范,围绕农田肥力与作物耗水状况测试了旱地主要作
Foreword Ningnan mountainous areas belong to the Northwest Loess Plateau, Dagougou deep, nine drought ten years, four materials (feed, fuel, fertilizer, timber) are all deficiencies, is the famous “border” poor areas. Whether it can make full use of the existing light, heat and water resources in dryland agriculture, which accounts for 94% of the total cultivated area, is a research topic worthy of attention. To this end, in 1983-1986 years by arid and semi-arid zone 3-year point-splitting area observation and one-year large-scale production demonstration, around the farmland fertility and crop water consumption conditions tested the main dryland