我国中性和石灰性土壤地区,在六十年代初期起就较广泛地选用0.5N碳酸氢钠溶液为土壤速效磷的浸提剂。北京农大于1965年春曾试用此溶液作为速测土壤硝态氮、铵态氮、速效磷、钾的通用浸提剂,认为效果良好,并指出由于溶液中的钠离子浓度较低,钾的测得值比10%硝酸钠(1、2N)浸提法的结果约低60%。1975—1976年全国土壤普查、土壤诊断研 In neutral and calcareous soils of our country, 0.5N sodium bicarbonate solution was used as the leaching agent of soil available phosphorus in the early 1960s. Beijing Agricultural University in the spring of 1965 had tried this solution as a rapid determination of soil nitrate nitrogen, ammonium nitrogen, available phosphorus, potassium general extractant, that the effect is good, and pointed out that due to the solution of sodium ion concentration is low, potassium The value is about 60% lower than the result of 10% sodium nitrate (1, 2N) extraction. National Soil Survey, 1975 - 1976, Soil Diagnostics