县域土壤速效钾测试数据数理统计分析应用

Application of Mathematical Statistical Analysis of Test Data of Soil Available Kalium of County Land

结合专业背景知识,应用数理统计知识对县域测土配方施肥土壤速效钾测试数据进行筛选,将大样本数据视为正态总体抽样分布,应用概率密度曲线函数变量X落入(μ-3σ,μ+3σ)概率占99.73%,据此标准对数据进行多轮次剔除,直至所有数据值都在(μ-3σ,μ+3σ)范围内,提高样本的代表性,并进行描述性统计。对县域土壤速效钾状况做频数分布图表分析,应用丰缺指标的数据分析,不同行政区域的数据分析,并提出施肥指导建议。

Combining with background knowledge, application of mathematical statistics on the county soil testing and fertiliz- er soil potassium test data filter, the large sample data as the sampling distribution of the normal population, fall into the ap- plication of the probability density curve fimction variable X（μ-3σ,μ the probability of ＋30- is） accounted for 99.73% of this standard, the data multiple rounds removed, until all the data values in the （μ-3σ,μ＋3σ） range, to improve the representa- tiveness of the sample, and descriptive statistics. The authors analyzed status of soil available kalium by using frequency dis- tribution, analysis of indicator of lack and abundance and different administrative areas. Finally, the authors put forward sug- gestions of guiding fertilization.