Desenvolvimento inicial de um clone de Eucalyptus grandis W. Hill ex Maiden x Eucalyptus urophylla S. T. Blake sob diferentes sistemas de preparo do solo

Abstract

The soil preparation for the implantation of forest planting is intended to improve the conditions for the development of the plants. This study evaluated the influence of three methods of soil preparation in the initial development of Eucalyptus grandis x Eucalyptus urophylla. The treatments used were: manual pit, specialized subsoiling and conventional subsoling. The experimental design applied entailed randomized blocks, being 6 repetitions with 100 plants per parcel. Plant height evaluations were made at 4, 8 and 12 months and the canopy base diameter at 4 and 8 months. The diameter of the breast height and the volume were also evaluated 12 months after planting. The data was subjected to the analisys of varience and complemented with Tukey test to 5% probability for averege comparisons. The following results were obtained: the average height of plants was influenced by the method of soil preparation in all evaluations, being the specialized method superior to the others the average canopy base diameter was higher in the specialized method, but it did not present statistical difference in the other tow methods (at 4 and 8 months), at 12 months the diameter of the breast height as well as the estimated volume of wood for specialized and pit method were superior to the conventional method. Based on the results of plant growth at height, conopy base diameter and diameter of the breast height, the specialized method soil preparing is recommeded, as it resulted in greater benefits to plants at an early stage of development. It should be highlighted that these results are preliminary and it is important to continue with further evaluations, allowing data to be obtained throughout the entire crop cycle.