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我国北方石灰性土壤中速效性钾的测定,过去一般采用亚硝酸钴钠容量法和火焰光度法,野外常用四苯硼钠和亚硝酸钴钠比浊法.火焰光度计仅能在有条件的实验室使用,亚硝酸钴钠容量法则操作手编繁複,四苯硼钠或亚硝酸钴钠比浊法的精度较差.土壤中硝态氮的测定,在实验室一般用酚二磺酸比色法,野外常用硝酸试粉比色法.前者手续复杂,后者精度较
The determination of available potassium in calcareous soils of the northern China in the past generally used the cobaltous nitrite volumetric method and the flame photometric method, commonly used in the field of sodium tetraphenylborate and cobaltous nitrite turbidimetry.The flame photometer only in the conditional Laboratory use, cobaltous acid content of sodium nitrite capacity of the hands of complex manual operation, tetraphenyl boron sodium or sodium nitrite turbidimetric poor accuracy. Determination of nitrate in soil in the laboratory generally with phenol disulfonic acid than Color method, the field commonly used nitric acid test powder colorimetric method. The former complex procedures, the latter more accurate