The Indicators of the Soils and Their Importance upon the Entomologic Fauna in the

Abstract

The concept of quality of the soil takes within its content the entire range of the necessary factors for the development of the plants. This proves that the soil represents a complex in an everlasting interpenetration. In this respect there exists the interest and the obligation as well of offering the soil favorable conditions in order to give it properties that can afford, as a feed-back to assure the social and economical development of the community. The observations and the collecting of samples were done during March - April 2012. There were analyzed the physical indicators as the granulometry and the chemical indicators: pH, the content of nutritive elements (pH, N, K,) and the organic carbon and humus. Among the biologic indicators the attention was focused to the agricultural entomologic fauna, the diversity of species and the vigor of plants. There was emphasized the content of heavy metals in Axente Sever-Copșa Mică area, knowing that these have serious implications upon the vegetation, animals and humans. The object of our research is the corn culture because this represents the main field culture in Romania, with surfaces all over the country, including the Sibiu County. In the corn field in Axente Sever - Copșa Mică there were identified 2 species of pest with a significant economical importance: Tanymecus dilaticollis (corn weevil) and Locusta migratoria , species that cause great damages in production and even compromising the culture. The obtained results from the chemical and agricultural chemical analysis make the object of the present work.