Eucalypt coppices behavior under application of plant growth regulators

Abstract

This study aimed to evaluate the influence of TDZ; calciocianamide, and thiourea in the emission and development of eucalyptus shoots. The study was conducted in clonal sprouts of an Eucalyptus urophylla x E. grandis clone, located in the city of Mogi Guaçu, Northeastern State of São Paulo. The climate was Cwa. Harvesting was performed in the stand at age of 6.5 years. The diameter of the shoots at the twelfth month, the height of the shoots at six, twelve, and eighteen months of age and the number of shoots by coppice at three, six and twelve months postharvesting. The thinning of coppices occurred at the twelfth month, and left two shoot/stump. There were used the following treatments: T2: complete fertilization; T10: complete fertilization + calciocianamide; T11: complete fertilization + TDZ; T12: complete fertilization + thiourea. TDZ and calciocianamida affected the shoot height up to 12 months after post-harvesting. Doses of TDZ, thioureia, and calciocianamida applied onto the strains show no effect on the shoot height, shoot stem diameter, and number of sprouts of that eucalypt clone after 18 months after post-harvesting.