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棕壤连续13年定位试验表明，长期施用化肥或低量有机肥对土壤固定态接含量均无显著影响;而施用高量有机肥区固定态接含量比试验前平均增加30.2％。这部分增加的固定态按主要来自土壤有机氮矿化补充。施肥后固定态铵的净增加量超过作物施氮量是土壤激发效应的结果。土壤原有固定态铵含量在113～116mg／kg，对作物无效，而新固定态按时作物有效。生长季耕层土壤固定态铵总释放量（N）对照区为43kg／hm2，化肥区平均为110kg／hm2;有机肥与化肥配合区平均为165kg／hm2。施钾对固定态铵的释放有一定抑制作用。
The browning soil positioning experiment for 13 consecutive years showed that long-term application of chemical fertilizers or low-level organic fertilizers had no significant effect on the content of soil solid-state fluxes. However, the application of high-dose organic fertilizers had an average increase of 30.2% before the test. This part of the increase in the fixed state is mainly due to mineral organic nitrogen mineralization supplement. The net increase of fixed ammonium after fertilization exceeds the crop nitrogen application is the result of soil excitation. Soil original fixed ammonium content of 113 ~ 116mg / kg, the crop is invalid, and the new fixed-time crops effective. In the growing season, the total ammonium released from the fixed soil (N) was 43 kg / hm2 in the control area and 110 kg / hm2 in the chemical fertilizer area. The average organic compound fertilizer area was 165 kg / hm2. Potassium on the release of fixed ammonium have a certain inhibitory effect.