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近年来,由于土壤普查工作的开展和研究工作的深入,对土壤测定迫切要求能采用迅速、经济、简便、统一的测定方法.特别是提出施肥建议时,必须有各种可供比较的稳定指标.目前全国土壤速效磷的测定,倾向于统一用Olsen法(不包括精密的研究工作),但在我国实际条件下还觉得有些不足.因为单独使用NaHCO_3提取,受土壤pH的影响很大,对提取温度的要求很严格,温度和放置时间也影响提取液本身的pH,提取出的磷量少,范围窄,差别不大;在酸性土壤上
In recent years, due to the work of soil census and the further research, the determination of soil urgently requires the rapid, economical, simple and uniform determination method, especially when it comes to the suggestion of fertilization, there must be a variety of stable indicators At present, the determination of available phosphorus in soil tends to unite the Olsen method (excluding the precise research work), but it still has some shortcomings under the actual conditions in our country.Because NaHCO 3 extraction alone is greatly affected by soil pH, Extraction temperature is very stringent requirements, the temperature and the placement time also affect the pH of the extract itself, extracted less phosphorus, narrow range, the difference is not; in acidic soil