Evaluación de diferentes condiciones climáticas para el desarrollo de un injerto de hendidura de Pinus radiata D. Don, en la empresa aglomerados COTOPAXI S.A.

Abstract

This research aimed to evaluate different climatic conditions for the development of cleft grafts of Pinus radiata D. Don. The research was carried out in the San Joaquín forest nursery belonging to the Aglomerados Cotopaxi enterprise. A one-year rootstock and spikes from a clonal orchard were used. Forty units were grafted which were so distributed according to their origin and within each one two treatments. The first one was the graft under the micro tunnel, and the second one was under the micro tunnel and covered the part of the graft with a transparent cover. Survival was evaluated for eight weeks; as well as height, chlorosis, and straightness for four weeks. The statistical design was a completely randomized design with two treatments and 10 repetitions. Statistical analysis was carried out using the free software InfoStat. The result obtained in treatments one, two, and four was 100% (percentage of survival) and in treatment three 95%, with a general average of 97.5%. In height, treatment one had a growth of 0.5 mm, and treatment two had a growth of 1.3 mm. In chlorosis, treatment one had 30% affectation, and treatment two had 10% affectation. In straightness, treatment one had 70% of total straightness, and treatment two had 80%. Even though there was no statistically significant difference, treatment two showed the best behavior for graft survival and development. It was recommended to carry out other tests testing other types of treatments in which a few degrees more temperatures could be preserved.