Repeated applications of organic amendments increase soil organic carbon (SOC) storage and nitrogen (N) availability for crops. Soil-crop models can facilitate the study of these effects and optimize the management of amendments. In soil-crop models, C and N mineralization of amendments is simulated by several pools of soil organic matter which have their specific turnover rate. We used the STICS model to quantify the effects of amendments on C and N dynamics in the long-term QualiAgro experiment, in which four amendments were spread every 2 years since 1998. We studied the model’s ability to simulate laboratory incubation and field experiments, depending on the calibration method and the partitioning of the amendment into one or two pools. The one-pool model simulated C and N dynamics in the field experiment as accurately as the two-pools model with a calibration based on field data. However, C and N dynamics measured under laboratory conditions could only be simulated with the two-pools model, which was then used to simulate C and N in the field. The root mean square errors were 1.6 t DM ha⁻¹ for grain yield, 2.6 t C ha⁻¹ for SOC and 41 kg N ha⁻¹ for soil mineral N. Model parameters could be determined using the C:N ratio of amendments and the indicator of remaining organic carbon (I_ROC), measured at the laboratory. The STICS model can thus be used to simulate SOC and N dynamics with long-term amendments with a simple calibration.

重复应用有机改良剂可增加土壤有机碳（SOC）的储存量和作物的氮（N）的利用率。土壤作物模型可以促进对这些影响的研究，并优化对修正物的管理。在土壤作物模型中，修正剂的碳和氮矿化作用是通过几个具有特定转化率的土壤有机质库来模拟的。在长期的QualiAgro实验中，我们使用STICS模型来量化修正对碳和氮动力学的影响，该实验自1998年以来每2年传播4次修正。我们研究了该模型模拟实验室培养和现场实验的能力，具体取决于校准方法以及将修正案划分为一个或两个池。单池模型在野外实验中模拟C和N动力学的效果与两池模型一样精确，并基于田间数据进行了校准。但是，只能使用两池模型模拟在实验室条件下测得的碳和氮动力学，然后将其用于现场模拟碳和氮。均方根误差为1.6 t DM ha^-1籽粒产量，2.6吨碳公顷^-1为SOC和41千克氮公顷^-1土壤矿物N.模型参数可以使用C来确定：修正N比和残留的有机碳的指示器（我_ROC） ，在实验室测量。因此，STICS模型可通过简单的校准通过长期修正来模拟SOC和N动态。