| Abstrakt: |
Modern technologies for soil preparation for afforestation of weak stony soils, based on the specialized tractor and self-propelled forestry milling machines, began to enter Bulgaria more and more widely in the last ten years. The main representatives of these machines in our country are leading European brands, such as FAE, SEPPI, AHWI, etc. Compared to the traditional technologies and machines used so far in our country, such as plows, harrows and cultivators, forestry rotary tillers provide a more homogeneous structure, a higher degree of shredding and aeration of the soil, and a more complete reduction of shoots and competitive vegetation in young forest plantations. However, the deep milling process also requires higher power of the drive units and greater energy consumption. The present work presents the results of an experimental study of a self-propelled milling unit PT-400 with a multifunctional forestry milling machine FAE 300/S for deep soil preparation for the poplar plantations establishment in typical poplar habitats located in river floodplains. The obtained experimental results were used to build mathematical models for determining the time and fuel costs of the forestry tillers for deep soil preparation of alluvial sandy, sandy-clay and clay soils, at different speed regimes of the tillers. On the basis of these models, the optimal speed modes for the operation of forestry tillers for deep soil preparation on light, medium-heavy and heavy soils have been established. [ABSTRACT FROM AUTHOR] |
