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Articles by Petru CARDEI
Total Records ( 2 ) for Petru CARDEI
  Raluca SFIRU , Petru CARDEI , Vergil MURARU and Vasile HEREA
  This paper presents a simple and inexpensive alternative risk management of surface soil erosion and landslides for vineyards farms. The application is cheap because it uses very cheap or even free of charge techniques and tools. Furthermore, this method can be also applied and used for other type of farms. At the same time, the method can be applied to any land and not only for the risk management of the soil erosion and landslides, but also for managing data and records of land parcels with different uses. The main idea is using free GIS software in order to obtain the necessary geometric data required for the relevant area relief. GIS software can archive geometrical characteristics of terrain data, soil data, vegetation covering data, etc. Risk estimators calculation is achieved by two basic models of soil erosion and landslides. Risk maps are performed using the same GIS software.
  Petru CARDEI
  This paper exposes an extension of the simplest mathematical model of soil organic matter decomposition. The equation of this model is very common in the literature, for example, Davidescu and Davidescu (1981), or Willigen et al. (2008), considering some changes in a single model-components, such as Schnitzer and Khan (1978). The main idea is that the development of natural processes, is directly influenced only by the natural parameters (temperature, humidity, etc.), and only indirectly by the temporal parameter. The model proposed in this paper express this idea. Time dependence of the concentration of organic matter in soil is due only by the time dependent describing of the natural parameters evolution. This time dependence facilitates on human observer the understanding and communication. The prognosis of the concentration of organic matter in soil and the evaluating of the fertilizer management are application of the model.
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