CONTRIBUTION TO KNOWLEDGE FOR GRAFTING CLONING OF Pinus patula Schiede ex Schltdl. et Cham.

Techniques for grafting in Pinus patula

Abstract

Grafts in Pinus species are used for the establishment of asexual seed orchards. Generally, it is obtained under joining, so it is necessary to study the factors that influence the success of the graft. Some of the factors are related to the grafting technique and the contact surface of the cambium, which depends on the length of the cut in the spike and the pattern surface. The objective of the study was to test three grafting techniques and three cutting lengths, to determine their effect on graft success and growth, as well as the development of needles in Pinus patula. Active growing buds were used, applying the terminal, lateral and simple English graft technique, as well as different cut lengths (1.5, 2.0 and 2.5 cm) in a completely randomized design with a factorial arrangement. At 60 days after grafting, in general, 70% seizure was obtained, with an average growth of 17.6 mm and 60.5% development of needles. The graft technique had an effect on the succes, presenting the highest value when using the terminal graft (80%) without statistical difference with the lateral one (73.3%), but between the terminal and English (56.7%). The length of the cut in the barb and pattern, as there are no differences, it is suggested to apply in the range of 1.5 to 2.5 cm. The terminal graft with a cut length of 1.5 cm produced the best growth. The terminal and lateral graft with a cut length of 1.5 to 2.5 cm were better in the attachment of Pinus patula rods, although the terminal graft with a cut of 1.5 cm favors the growth of the graft more.