Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Adrian PICA, Florin BOJA, Alin TEUŞDEA, Ciprian FORA, Mihaela MOATAR, Nicușor BOJA
The mechanization technologies of soil works have a major impact on physical state of soil. This situation is generated by the mechanical action of working parts which are involved in soil works and by the traffic of running systems of tractors and agricultural machines. In order to carry out the research, we settled in six forestry nursery of the West of Romania so that we could have six different types of soils which are representative for that specific area. From each profile was collected soil samples in three steps of 6, 12 and 18 cm. For each sample were performed six repetitions (N = 6). We started by measuring the particle size distribution (granulometric composition) and the main physical properties of the soil (moisture, bulk density, total porosity and soil compression degree). Advanced methods of statistical analysis (univariate three-way ANOVA and multivariate analysis, PCA, Manova and HCA) began to be successfully used in recent years for the study of soil behavior at the interaction with the working bodies. Vibro-cultivators are machines for seedbed preparation. They are equipped with tools sustained by elastic suspension. The elasticity of supports facilitates the oscillations of working tool - elastic support assembly. This set has a natural mode shapes which corresponds to a natural frequency of vibration. Seedbed preparation for crop establishment (sowing) is one of the most important works in forestry nursery, as is done with high energy consumption and high costs.
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