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在辽西碳酸盐褐土上进行的田间试验。结果表明，物料中有机氮矿化进程也可区分为快、慢两个阶段，其矿化速率则明显落后于有机碳，因而其残留率较有机碳为高；经２～３年分解后各种有机物料残留物的Ｃ／Ｎ比趋于一致并接近土壤腐殖质Ｃ／Ｎ比。停止施用有机农肥土壤的供氮力逐年下降，说明土壤中有机肥的残留有机氮积累是决定土壤供氮力的主要氮源；每年作物残茬、根系中有机氮的矿化和土壤腐殖质氮的缓慢分解，只能维持土壤低水平的供氮力，在本例中这一供氮力约为每年每公顷４０ｋｇ（Ｎ）上下。
Field experiment on carbonate brown soil in western Liaoning Province. The results show that the process of organic nitrogen mineralization can also be divided into two stages of fast and slow, the mineralization rate is significantly behind the organic carbon, so its residual rate is higher than organic carbon; after 2 to 3 years of decomposition The C / N ratio of organic material residues tends to be consistent and approaches the soil humic C / N ratio. The application of organic fertilizer to stop the application of organic nitrogen fertilizer decreased year by year, indicating that residual organic nitrogen in soil organic nitrogen accumulation is the main nitrogen source determining soil nitrogen supply; annual crop residues, organic nitrogen mineralization and soil humus nitrogen Slowly decomposing to maintain a low N supply for the soil, which in this case is about 40 kg N per hectare per year.