Linijinių ir hibridinių rapsų žiemojimo priklausomumas nuo skrotelės cheminės sudėties skirtingu laiku sėtuose pasėliuose

Abstract

The aim of our investigation was to determine the effect of sowing time of winter oilseed rape en autumn rosette chemical composition and over-wintering. The experiment carried out in the Experimental Station of Lithuanian University of Agriculture in 2009-2010. Chemical composition of rossete of winter rape sown at different time influenced crop over-wintering - significant correlation between this indicators was established. The stronger influence of the winter rape rosette composition on over-wintering was established in rape of linear cultivar 'Sunday' than in rape of hybrid cultivar 'Kronos'.Winter rape of hybrid cultivar over-wintered better - 39, 2-77,0%, winter rape of linear cultivar - 12,8-54,0%. Winter rape sown on 30 August - 5 September best over-wintered. They acumulated 15,23-18,14% of dry matter, 5,03-5,69% of total sugar, N and K ratio was 1,64-1,72 in leaves, and in apical bud - 18,43-19,68% of dry matter, 6,00-8,49% of total sugar, N and K ratio was 1,58-1,69. Winter rape of hybrid cultivar sown at later dates prepared for over-wintering more intensively. Winter rape of both cultivars sown at the latest date not over-wintered