Mihaela Surmei Balan

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RESEARCH ON THE INFLUENCE OF FERTILIZATION ON PRODUCTIVITY OF SIMPLE MIXTURE BETWEEN PERRENIAL LEGUMINOUS AND GRASS UNDER THE CONDITIONS OF MOLDAVIAN SILVOSTEPPE

Mihaela Surmei Balan, V. Vîntu, C. Samuil, M. Stavarache, I. Muntianu, C.I. Popovici, C. Ciobanu

Abstract
Research has followed the influence of fertilization on productivity of simple mixtures between perennial grass and leguminous under conditions of Moldavian silvostepe. In 2006, on mixtures studied the production increases achieved at fertilization dose N200P100 kg ha-1 were statistically ensured only in mixtures with 50% -70% Onobrychis viciifolia and on the 5 t ha-1 vinassa and 30 t ha-1 manure agrofunds the production increases were statistically ensured only on mixture with 70% Onobrychis viciifolia. In 2007, on fertilization rate of N200P100 kg ha-1 was registered a decrease of production of 0.86 t ha-1 DM, and production increases statistically ensured were achieved only on mixtures with 20-30% Onobrychis viciifolia. On fertilization with 5 t ha-1 vinassa the production increases were higher and statistically ensured on the mixtures with 20-50% Onobrychis viciifolia and on the fertilization with 30 t ha-1 manure the production increases were lower than those obtained on fertilization with 5 t ha-1 vinassa. In 2008, there were achieved very high productions for the conditions of the Plain of Moldavia on all agrofond, which are equal to the level of production made by some mixtures under irrigation. Fertilization brought production increases to all mixtures, the highest yields were achieved on fertilization with 30 t ha-1 manure on mixture with 70% Onobrychis viciifolia + 30% Bromus inermis.

Key words: simple mixtures, fertilization, production, vinassa, nitrogen