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山西河曲砖窑沟流域试验区栗褐土上连续13年的定位施肥试验结果表明,不同施肥处理对表层土壤有机质含量的影响极为显著,对亚表层的影响不明显。13年后按差异显著性将不同处理分为三组,即不施有机肥的处理为一组,3个低量有机肥为一组,2个高量有机肥为一组,各组13年后的土壤有机质含量依次为4.8g/kg～6.4g/kg,9.0g/kg～10.6g/kg和12.1g/kg～13.0g/kg,变化量分别约为±30%,+65%和+100%。
The results of the experiment of applying fertilizer on chestnut-cinnamon soil for 13 consecutive years show that the effect of different fertilization treatments on soil organic matter content is very significant, but the effect on sub-surface is not obvious. After 13 years, the different treatments were divided into three groups according to the difference in significance, that is, one group without organic manure, one group with three low-level organic manures and two groups with high-level organic manures for 13 years The contents of soil organic matter were 4.8 g / kg ~ 6.4 g / kg, 9.0 g / kg ~ 10.6 g / kg and 12.1 g / kg ~ 13.0 g / kg, respectively, with the variation of ± 30%, + 65% and + 100%.