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在有计划的发展无机肥料工业中,必须建立一种测定因施用肥料而增产的科学方法。目前有40多种测定方法,但只能应用在试验站或农场条件下。对一个地区,省、边区,直至共和国范围,在规划产量时正确测定无机肥料量甚为困难。通常根据试验站或农场在田间进行不施肥的空白试验,来计算施肥的增产效果。但这种试验往往在优越条件下和在较平坦试验地上进行,获得的产量比一般生产条件下要高,因此在生产中应
In the planned development of the inorganic fertilizer industry, a scientific method must be established to measure the increase in production due to the application of fertilizers. There are currently more than 40 assays, but they can only be used at pilot stations or farm conditions. For a region, province, border area, up to the Republic, it is very difficult to correctly measure the amount of inorganic fertilizers when planning production. Fertilizers are often evaluated for increased yield based on a blank test that is not fertilized in the field by a pilot station or farm. However, such tests are often carried out under favorable conditions and on relatively flat test grounds and the yield obtained is higher than under normal production conditions, so that in production