Níveis e fontes de fertilizantes orgânicos na cultura do girassol (Helianthus annus L.).

Abstract

The sunflower (Helianthus annuus L.) is a crop of wide adaptability to various conditions latitude, longitude and photoperiod. being planted in all regions of Brazil, thus becoming one of the main crops for the production of biofuels. Nitrogen (N), as well as being one of the macronutrients more absorbed by plants, is the most limited to sunflower production thus making it essential the correct use of it. Thus, the aim with this study was to evaluate the effect of application of different nitrogen sources on growth and sunflower biomass production. The experiment was conducted at the Centro de Ciências e Tecnologia Agroalimentar (CCTA), belonging to the Universidade Federal de Campina Grande (UFCG), Pombal, PB, from August 20, 2014 to November 5, 2014, using a variety helium 251. the experimental design was a randomized block in factorial 2 x 6 x 1 , with 4 replications and the treatments consisted of two sources of organic fertilizer (bed and chicken manure Bovino), six bed leveis chicken (16001 32001 64001 128001 256001 51200 kg ha-l) and six leveis of bovine manure (32001 64001 128001 256001 512001 102400 kg ha-l). the highest values obtained for Height plant (AP), stem diameter (DC), Phytomass Freca (FF), Phytomass dry (FS) and leaf área (AF) were observed when it was used poultry litter as organic fertilizer supply (30,720 kg.ha -l), except for stem diameter and plant height.