Evaluation of different levels of organic fertilization and method of application in sunflower crop

Abstract

The sunflower (Helianthus annuus L.) is one of the main oleaginous plants grown in our country.
The objective of this study was to evaluate the effect of different doses of the organic compound
on the development of sunflower on two forms of application. The experimental design
was a randomized block design in a 5x2, and 4 repetitions, totaling 40 experimental units. The
factors consisted of five doses of organic compost (T1=0g de composto, T2=300g, T3=600g,
T4=900g e T5=1200g) and two forms of application: Not parceled (Pn) and parceled (Pa). The
analyzed variables were plant height (AP), stem diameter (DC), leaf area (FA), total chlorophyll
(CT), weight of the chapter and weight of 100 seeds, every 20, 40 and 60 DAE. The dose of
100% of organic compound was efficient in practically all the variables analyzed, and for the
same dose of compound in the split form (Pa), a higher seed weight was obtained. The use
of 600g organic compound in sunflower fertilization in split form promoted development and
productivity, attesting to the nutritional efficacy of the substrate.