农用地（耕地）.PPT

三、农田培肥的原则 施肥越多越好？ Is it better to apply more fertilizer? 施肥量与产量的关系 The relationship between how much fertilizer is applied and the yeild 作物产量 Yeild 养分供应量Nutrient supply 增加Increase 极限Extremity 毒效Toxic effect 高量 High amount 低量 low amount 适量 Appropriate amount 第一阶段 StageⅠ 第二阶段 StageⅡ 第三阶段 StageⅢ 总产量 Total Yeild C 转向点 Turning Point 边际产量 Marginal Yield 平均增产量 Average yield increase Y(yeild) 产量 施肥量 X yo 农田养分管理（培肥）的原则 The principle of farmland nutrient management 1. 生物措施与人工措施相结合 Use both biological measures and artificial measures 2. 有主有次，长短效相结合 There is a primary and a secondary, and combined long-acting and short-acting measures. 3. 注重全面均衡增产 Focus on comprehensive and balanced production. 四、农田培肥的途径The way of farmland fertilizer 由于地力是多因素综合作用的结果，建立与种植制度相适应的多途径培肥农田的技术体系，是耕作制度发展的需要和必然结果。For the reason that soil fertility is the result of comprehensive action of several factors, establising a technology system match the planting system is the necessary and inevitable result. 所谓农田培肥技术体系是：以地力动态平衡为基础，在建立良好的农业生产体系的同时，以人工施肥为核心，通过生物的、化学的、物理的、工程的、防护的措施构成多维养地，全面调控地力的技术体系。实施全方位、多途径培肥，尽可能使更多的物质和能量纳入到农田生态系统中来，是现代多维用地、高产出、高功能的种植制度的需要。 the so-called multi-pathed farmland fertilizer is : based on Soil dynamic balance, at the same time of establishing great agricultural productivity system, centred on artificial fertilization, by the means of biological, chemical, phsical, engineered, protective measures constitutes the system of comprehensively controlling soil fertility. Implementing all-rounded and multi-pathed fertilizer, inputting as more as possible material and energy into the farmland ecosystem, is the needs of cropping system of modern multi-dimensional use of land, high productivity and high function. 作用Functions： 生物固氮 biological nitrogen fixation； 增加土壤有机质increase organic matter content in soil； 活化土壤养分activate soil nutrient； 保持水土conserve water and soil； 疏松土壤loosen soil； 排除盐碱，等等discharge saline and alkaline etc。 　生物途径Biological Approach