The study was performed in conditions of the year 2009 on a mollic preluvosoil (SRTS 2003) in maize culture cultivated in classic and no-till systems. The energetic efficiency is quantified using two indicators: the energetic efficiency and the energetic balance. Following the energetical transformations made on equivalent basis, there was a report calculation between invested and obtained energy in agrosistem. Having a report between energy found in the main agricultural product – output – and energy invested in the ecosistem – input – determine energetic cost of every calory witin this product or conversion efficiency of energy invested.The energetic efficiency must be one of the main directions of economical restructuration in agriculture because assures production competitivity, takes environment protection into account and diminishes dependence from imported energy, mostly regarding fossiliyed fuels. The analysis effectuated over some agricultural crops of economical remarkable importance shows that after the use of particular technology based on mechanisation and high fertiliyation; the best efficiency was obtained to maise. The solar energy is not the only energetic input at plant disposal of agricultural importance. It is considered to be the most important and by all means it is free. the others inputs categories (soil preparation, sowing, fertilisation, phytosanitary treatments, etc.) require expulse which grow faster, from year to year, than biological-alimentary energy obtained by agricultural crops. For energetic analysis an important indicator is the structure of energy consumption. This has direct actively energy consumption (fuel, thermic energy, electrical energy), indirect actively  energy consumption (manure, pesticide, seed) and passive energy consumption (tractors and agricultural vehicles) as main elements of consumption. After the report accompolishment between energetic impust and output it has been shown that some energy units can be obtained for a consumed energy unit.

no-till; energetic analysis; energetic efficiency; energetic balance

Presentation: oral