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该文通过对灵璧县黄湾、韦集2乡镇土壤普查和农业部测土配方施肥项目化验,表明土壤酸碱度呈下降趋势,其p H值已由偏碱性的8.5下降到偏酸性的6.5,个别田块已接近5.0;2个乡镇的酸碱度相差0.5个单位,说明相邻乡镇的p H值差异是由于施肥习惯、种植模式等人为农事操作造成的,次数分布呈正态分布。土壤有机质从20世纪70~80年代持续增加,以后的近20a则表现出增长缓慢或略有降低趋势。相关分析表明:p H值在6.5~7.0之间,相关系数最高,r=0.279233*,说明土壤有机质积累需要合适的酸碱度。
This article through the Lingbi County, Huang Wan, Wei set 2 township soil survey and the Ministry of Agriculture soil testing and fertilization project tests showed that the soil pH decreased, the p H value from 8.5 to slightly acidic to 6.5 , And the individual field plots are close to 5.0. The difference in pH values between the two townships is 0.5 units, indicating that the p H value difference between adjacent townships is due to man-made farm practices such as fertilization habits and planting patterns. The number distribution is normally distributed. Soil organic matter increased continuously from 1970s to 1980s in the 20th century, and showed a slow or slight decrease in the later 20 years. Correlation analysis showed that: p H values between 6.5 and 7.0, the highest correlation coefficient, r = 0.279233 *, indicating that the accumulation of soil organic matter requires proper pH.