3Lorenzetti F. Achieving potential herbage seed yield in species of temperate regions [C]~oceedings of the X VX Intern- ational Grassland Congress, 1993.1621-1628.
7Vuckovic S. Influence of row spacing, seed rate and boron and zinc fertilization on alfalfa (Medicago sativa L.) seed yield and germination.review of Research Work at the Faculty of Agriculture, Belgrade. 1996,41:2,7-20.
8AL Noaim AAR,Koriem YS. Effect of row spacing and seeding rate on alfalfa (Hsawi) seed yield and two related traits.Journal of King Saud University, Agricultural Sciences[J]. 1992,4:2,247-257.
