An important problem refers to soil weeds seed bank with special reference to brown luvic soils and relationship between vegetal remains (roots + stub) and nutrition regime – crop rotation plant. A great number of seeds can be found in first 20 centimeters of soil (plowing layer). This fact causes a high weeds density, which has a negat
...ive effect on the cultivated plants leading to partial or total crop loss.
More sensitive than Mimosa pudica and more beautiful than any adornment detached from nature by man, the azalea (Azaleea indica) gathers through its shapes a real symphony of colours and enchanting hues, of elegant shapes, having no rival in the flower world. The azalea can multiply through seeds and vegetatively: seedlings, grafting, lay
...ering. The widest reproduction method remains that through semilignified seedlings, a method that can be used throughout the year avoiding the months less favourable for propagation by seedlings, with poor light: November and October. The best results are given by the spring propagations by seedlings (February-March) and the summer propagations by seedlings (July-August). The rooting can last for 12-14 weeks until the seedlings can be transplanted in flower pots without risks. A wide application in horticultural practice is the use of growth substances, that take part in the faster formation of roots and in a higher percent for species of plants, that, normally, root with difficulty through seedlings. Under this aspect, many synthetical compounds have proved to be very active (IAA, NAA, IBA, 2,4,5-T acid etc.) (3,4).