Phytomass partition of sunflower silage, under boron and calcium fertilization

摘要

This work aimed to determine the distribution of sunflower phytomass and the effect/cause relation between the variables analyzed in silage production, under calcium and boron fertilization. The experiment was carried at Federal Technology Universityof Parana, Campus Dois Vizinhos, PR, Brazil, from September, 2008 to Abril, 2009. The soil is aNitossolo Vermelho Distroferrico umbrico by Brazilian classification and Ferralsol by WRB. Treatments were composed of: (i) Witness; (ii) 2000 g of B/ha applied via soil at sowing; (iii) 250 (iv) 500 (v) 750 and (vi) 1000 g of Ca/ha applied in leaves; (vii) 250 (viii) 500 (ix) 750 and (x) 1000 g of B/ha applied in leaves. Leaf application was made by dissolving each treatment and applying in 200 litres (L)/hasolution, with the respective treatments, about two weeks before flowering stage. Plants were harvested to produce silage when grains were with 35% humidity. Boron and calcium fertilization does not change the phytomorphologic variables analyzed in thisexperiment. Inside the variables, dry phytomass of seeds was the most important in silage production, with a direct correlation with final yield in the field. Indirectly, the variables dry phytomass of stem + achene and green leaves were responsible forincreasing silage yield, also.