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根据全国土壤普查《规程》要求,土壤速效钾的测定,常采用中性1N乙酸铵浸提,火焰光度计定量钾和10％硝酸钠浸提、四苯硼钠比浊测定钾。由于两法浸提剂的提取强度和定量钾的方式不同,加之目前推广的比浊法存在氨的干扰,使同一土样因测定方法不同或同一含钾水平因铵态氮含量不同,测定结果往往相差很大。
According to the National Soil Census “Regulations” requirements, the determination of soil available potassium, often neutral 1N ammonium acetate leaching, flame photometric quantitative potassium and 10% sodium nitrate extraction, sodium tetraphenyl boron turbidimetric determination of potassium. Due to the difference between extraction intensity of two extraction agents and the method of quantifying potassium, coupled with the ammonia turbidity method currently promoted by turbidimetry, the determination of the same soil sample due to different determination methods or the same potassium content due to different ammonium nitrogen content results Often very different.