结合土壤普查,大搞群众性的土壤化验,正在全国各地蓬勃展开。这是进一步揭开土壤秘密和因土施肥的一种有利手段。因此养分或盐分速测箱受到广大群众欢迎。在使用过程中各地常来函询问:从养分比色卡片的百万分单位换算成每亩所含斤数的单位时,发现有两种换算方法,不知那一种方法正确。现就我所知说明如下,以供参考: In combination with the census of the soil, we should vigorously conduct mass soil tests and are vigorously developing throughout the country. This is a favorable means to further reveal soil secrets and fertilize soil. Therefore, nutrient or salt speed test box by the masses. In the process of using letters from all over the world asked: from the colorimetric million copies of units into units per kilogram of the number of pounds, found that there are two conversion methods, I do not know that one method is correct. Now, as far as I know, the following is for reference: