RESEARCHES CONCERNING THE USE OF ALPHA-ALPHA AS COVERCROP FOR SUNFLOWER CULTIVATED AFTER NO TILL TECHNOLOGY
Lot of research effort is devoted nowadays for reduced tillage. The new no-till technology brings about changings and challenges. Agronomists became aware of the benefits of this system and try to make it suitable for different soil-clime conditions. Soil organic matter, mineralization, erosion, compaction and last but not least, the high energy requirements are the main disadvantages of the plow-based agriculture. The no till system has disadvantages, too: soil temperature decreasing, higher leaching, difficult low soluble fertilizer incorporation but its advantages strongly overpass them. They can be summarized as follows: increasing soil organic matter content, reducing the fuel and labor consumption as well as machinery requirements, almost stopping the soil water erosion, increasing the yield by approx. 20%, increasing the surface that can be worked by a farmer and enhancing the benefit. The present paper presents the results of an experiment carried out during 4 years. The first three years the experimental plots were planted with alpha-alpha. In the spring of the fourth year the alpha-alpha vegetation was destroyed by glyphosate and there was sown sunflower. The results were very good (2,400 kg/ha) as compared with the plowed treatment.