Crescimento inicial do eucalipto (Eucalyptus) submetido a diferentes doses e formas de aplicação de fósforo no município de Urbano Santos - MA

Abstract

The present study aimed to evaluate the initial development of two eucalyptus varieties, under different doses of phosphate fertilization. The experiment was conducted at Fazenda Mesquita located in the municipality of Urbano Santos - MA. The experimental design was in randomized blocks (DBC) with split plot and 5x2 factorial arrangement (5 doses x 2 clones) with 3 replications plus the control without fertilization. The treatments consisted of: T1= without phosphate fertilization (control); T2=150 kg/ha of phosphorus in the form of P2O5 at planting (furrow); T3=300 kg/ha of phosphorus in the form of P2O5 at planting (furrow); T4= 150 kg/ha of phosphorus in the form of P2O5 at planting (furrow) + 150g at 60 days, in crown; T5= 150 kg/ha of phosphorus in the form of P2O5 at planting (furrow) + 150g at 90 days, in crown; and T6=150 kg/ha of phosphorus in the form of P2O5 at planting (furrow) + 150g at 120 days, in crown. The evaluations were carried out from November 2019 to May 2020 and the clones evaluated were Eucalyptus MA2000 and MA2001 (Eucalyptus urophylla x Eucalyptus tereticornis). The parameters evaluated were plant height and stem diameter at breast height (DBH), at 6, 9 and 12 months after fertilization. It was found that the MA2001 clone was the one that presented the best development in this first year, mainly at the dosage of 300kg/ha applied in the furrow at planting