The soil, the most important component of the biosphere and the main mean of production in agriculture, is destroyed by a range of factors and with this destruction takes place a rupture of some ecological balances between them or between them and the biosphere. Among the factors that destroy the soil are the mine exploitations at surface, having as result empty land which has at their surface rocks from different depths, with essential changes in the natural geomorphology of that area. The attraction of the degraded land in the economic circle; it is necessary to elaborate and to realize the recultivation project for the mine exploiting at surface (this is happening in the same time). Taking into consideration the physical and the chemical qualities which are not suitable for the growth and development of the plants and the low fertility of the barren gangue, the main objective of the biological recultivation was the increase of the content of organic material and nourishing elements which assure the necessary food for the cultivated plants through the use of organic fertilizers like compost, and also the mineral fertilizers with nitrogen and phosphorus. The experience took place in Husnicioara quarry from Mehedinti county on a barren gangue, with a very small content of humus (0,2 – 0,4%) and nourishing elements (nitrogen: 0,08 – 0,16%; phosphorus that can be assimilated 4,5 – 29,9 ppm; potassium 36,5 – 61,4 ppm), and the objectives were: - the effect of different doses of compost and the interval of application on the chick pea crop in the spring; - the effect of different doses of chemical fertilizers on the chick pea crop in the spring. The application of different doses of compost has determined crops that have grown from the unfertilized witness, to the variant which has received the biggest quantity of organic material. The calculus of an average for a period of three years highlighted the value differences between the variants with the witness form 132 to 330 kg/ha, statistically assured in the limit of 0,1%. The research made on the influence of time interval at the application of compost on the chick pea crop have highlighted important differences between witness and the variants with application at 2 and 3 years. The annual fertilization assured the highest value of the production and its constancy, and the application of mineral fertilizers on chick pea crop lead to different crops function of the applied doses.

sterile dumps; fertilization; chick pea crop

Presentation: oral