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在土壤肥力的研究中,为了反映土壤的生产力,单靠土壤潜在肥力的指标——全氮、有机质等,已远不能满足要求;而土壤速效性养分指标,如NH_4~+-N和NO_3~--N等,因受自然条件及人为措施的影响而变化过快,亦无法说明土壤的有效肥力及其与产量之间的关系。对于了解二者之间的所谓“潜在有效肥力”部分,是十分必要的,因此迫切需要一种能够作为土壤对作物供氮能力的指标的快速测定方法,以供在研究土壤肥力和制订措施时的依据。 目前认为可以反映出土壤对作物供氮能力的最可靠的方法是培养法,这就是在适宜的水分和温度条
In the research of soil fertility, to reflect the productivity of soil, the indicator of potential fertility of soil alone, such as total nitrogen and organic matter, is far from meeting the requirements. The soil available nutrients such as NH_4 ~ + -N and NO_3 ~ - N and so on, due to the natural conditions and man-made measures change too fast, can not explain the soil fertility and its relationship with yield. There is an urgent need to understand what is known as the “potentially effective fertility” component between the two, and there is an urgent need for a rapid method of determining what can be used as a proxy for the ability of soils to supply nitrogen to crops for use in studying soil fertility and developing measures The basis. At present it is considered that the most reliable method that can reflect the ability of soil to supply nitrogen to crops is the culture method, that is, under suitable water and temperature