FRESH BIOMASS PRODUCTION OF DOUBLE CROP MAIZE (Zea mays L.) HYBRIDS CULTIVATED IN MOARA DOMNEASCA, ILFOV

Double crops system constitutes a means by which the vegetation factors can be more efficiently exploited (Tiru, 1973). In Romania the specie most used for double crops is maize, because it can be harvested as grain or as fresh biomass if the climatic conditions do not ensure the attainment of physiological maturity. To reach physiological maturity the double crop of maize needs between 900 and 1800o C (Tiru, 1973) and a irrigation regime of 2000 m3 water/ha (Hulpoi, 1966). Also the fertilization levels play an important role in the attainment of physiological maturity (Budoi, 1988). The research done has the purpose of establishing the optimal precocity of the hybrids used for double crops in the pedoclimatic conditions of Moara Domneasca, Ilfov and also to assess the importance of the fertilization levels and irrigation regime on double crops. In the conditions of 2013, the maize double crop was harvested as fresh biomass, yielding between 28 and 64 t/ha, considering the hybrid, fertilization level and irrigation regime.