碱性土壤有效磷测定方法研究

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中图分类号 S153.6 文献标识码A 文章编号 1007-7731（2025）17-0084-04

DOI号 10.16377/j.cnki.issn1007-7731.2025.17.021

Research on the determination method of available phosphorus in alkaline soil

YAN Jun FU Encheng

（GeneralStationofCultivatedLand QualityandFertilizerManagementin ZhejiangProvince，Hangzhou31o2o，China）

AbstractTo enhance the eficiencyand quality of available phosphorus detection in alkaline soil，this study referenced the method specified inNY/T 1121.7-2014“Soil Testing—Part7：Method for Determinationof Available Phosphorus in Soil"（using 25mL colorimetric vessels and manual degassing），while also employing 50mL colorimetric vessels and an ultrasonic degassing method to determine the available phosphorus content in alkaline soils （sample No.ASA-9，ASA-15，ASA-17）. The precision of the method was evaluated using relative standard deviation （RSD），and the influence of diffrent extraction temperatures （24，25，26°C）on the determination results was analyzed.The results showed that the standard curves of theestablished method all achieved R2 values of O.999 9，indicating excellent linearity.The measured available phosphorus contents of ASA9，ASA-15，and ASA-17 sample soils were in the ranges of 23.8-24.1， 53.5-53.9，and 8.3-8.6 mg/kg， respectively，all falling within the standard reference ranged. The RSD values ranged from 1.99% to 3.39% Temperature was found to have a certain influence on the determination results： when the ambient temperature was relatively low，the extraction solution can be maintained at before adding it to the extraction flask;when theambient temperature was relatively high，the extraction solution can be maintained at In conclusion， the method used in this experiment demonstrated high accuracy and excellent precision for the determination of available phosphorus sample in alkaline soil， making it suitable for large scale analysis.

Keywords alkaline soil; available phosphorus; ultrasonic degassing; precision

磷是植物生长发育不可缺少的主要营养元素，对保持品种的优良特性有明显作用1。（剩余5196字）