基于钼蓝比色法的土壤速效磷测定参数筛选
首发时间:2013-09-13
摘要:磷钼蓝比色法是常用的土壤速效磷检测标准方法之一,为测土配方施肥提供重要指导依据。然而在实际操作中发现,显色温度和钼蓝稳定时间会影响比色法的检测结果。为确保土壤速效磷的检测精度,本文在10℃-40℃、钼蓝反应结束后的0-80分钟范围内对实际土样进行交叉实验,对比了单次标定方式和独立标定方式的检测结果,最终分别获得适用于不同标定方式的优化检测条件。在优化检测条件下,单次标定方式的测量误差虽约为独立标定方式的3倍但其缩短了检测时间因而更适合多样本批量检测。通过选取全国主要作物种植区的55个土壤样本对单次标定方式下的优化检测条件进行测量验证,测量结果满足精度要求(MRE=0.042)并且与标准结果具有较好的相关性(R^2=0.97),验证结果表明优化的检测条件能够保证土壤速效磷检测精度并且具有一般适用性。
关键词: 农业电气化与自动化 土壤速效磷 钼蓝比色法 显色温度 稳定时间
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The determination of measured parameters in detecting Soil available phosphorus based on molybdenum blue colorimetric method
Abstract:Molybdenum blue colorimetric method is one of the standard methods of detecting soil available phosphorus and is crucial to guide variable fertilization. In practice, however, we find that color-developing temperature and stable time could affect test results. To ensure precision, in this paper we conducted a full factorial experiment under the temperature range from 10℃ to 40℃ and time range from 0 to 80 minutes after color reaction and compared the test results in single calibration mode with that in repetitive calibration mode. Eventually we optimized temperature and testing time conditions in the two different calibration modes respectively. Under the optimum conditions we conducted a verification test using 55 soil samples which were collected from main crop-growing regions of China. The test results had a better linear correlation with standard results (R^2 = 0.97) and a small mean relative error (MRE = 0.047), which could meet the accuracy requirement of variable fertilization.
Keywords: Agricultural Electrification and Automation Soil available phosphorus Molybdenum blue colorimetric method Color-developing temperature Stable time
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