Influenţa îngrăşămintelor foliare asupra creşteri suprafeţei foliare la măr

Abstract

In the period of 2008 - 2010, it wasst udied the influence of foliar fertilization on the development of foliar surface and yield of apple trees. The investigation included the varieties Golden Delicious, Idared and Florina of 8 years old, grafted on M 26 rootstock, planted on a distance of 4x2 m and used as fertilizer 46% Urea in concentration sfrom 0,4% to 1,2% indifferent stages of fruit development, Poly-Feed (NPK19:19:19+ Mn, Mo, Fe, Cu,Mg, Zn) of 0,1% and CaCl2 of 0,5% to 0,7% concentration. The leaf surface varied depending on the variety and concentration of foliar fertilizers (Urea 46%). The largest leaf surface - 15.5 m2 - was obtained for the variety Golden Delicious in the group 4 where the spraying was performed with 46% Urea in concentrations of 0,6%, 0,9 %, 1.2% and the smallest was obtained in the control group where the leaf surface was of 11,3 m2.