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石灰性土壤速效磷的分折,直至目前尚无一完善之方法。在现有方法中虽以马乞金所拟定的用1％碳酸铵作为土壤浸提液的方法,采用得较为普通;但是,浸提时间冗长,且作操繁琐。楚马钦科,曾将该法修改为用2％碳酸铵作浸提液,振荡5分钟,并静置1～2小时至土壤浸出液澄清为止。并以为此法处理之浸出液中速效磷含量与马乞金法相当。此外国内亦有人建议以少量的土样,用1%碳酸铵溶液浸提1小时(其间摇动3次,每次5分钟)的方法。这些方法虽然使操作简化,时间缩短,但仍不够理想。而且据我们重复上述两法的实验证明,其测定结果均较马乞金法低。
Calcareous soil available phosphorus, until now there is no perfect method. Although the method of using 1% ammonium carbonate as the soil leaching solution developed by Ma Qi-jin in the existing method is adopted, it is relatively common; however, the leaching time is long and the operation is cumbersome. Chuma Qinke, had amended the law with 2% ammonium carbonate as the extract, shaking 5 minutes and allowed to stand for 1 to 2 hours until the soil leachate clarified so far. And for this method to deal with leaching solution available Phosphorus content and Ma Qi gold law quite. In addition, some people in the country also suggested using a small amount of soil samples, 1% ammonium carbonate solution leaching 1 hour (3 times during the shaking, each 5 minutes) method. Although these methods to simplify the operation, reducing the time, but still not ideal. And according to our repeated experiments with the above two methods, the results of this test are lower than that of the Matilda method.