Sunflower plants nutrients accumulation and oil yield as affected by achenes vigour and sowing density

Abstract

The objective this work was to evaluate the nutrients accumulation and achenes oil yield in sunflower plants as affected by achenes vigour and sowing density. An experiment was installed in the field at Seropédica, State of Rio de Janeiro, in October 2006 with three lots of sunflower achenes, cultivar Embrapa 122 V2000, classified as low, medium and high vigour and two sowing density (45,000 e 75,000 seeds.ha^-1). The collected were realized at 20, 60 and 100 days after planting (DAP) to the determination the dry mater, nitrogen, phosphorus, potassium and calcium. In the collecting at 100 DAP too it was evaluated the achene yield (kg ha^-1), the content oil and oil yield (kg ha^-1). The results indicated that to the 60 days high accumulation of dry mater, N, P K and Ca in stem, leaves and total at density of 45,000 seeds ha^-1. The sunflower achenes oil yield and achenes and nutrients harvest index not affected by the achenes vigour and sowing density to. There was a preferential translocation of N and P for the achenes.