Evaluación de cuatro sustratos en la propagación sexual de Pinus radiata D. Don y Pinus patula Schiede & Deppe en condiciones de vivero.

Abstract

This research consisted on the evaluation of four substrates in the sexual propagation of Pinus radiata and Pinus patula under nursery conditions. The trial was established by applying a DBCA with a bifactorial structure of 8 treatments and 4 blocks. Four substrates were used S1) black soil 50% husk 25% sand 25%, S2) black soil 75% peat 25%, S3) black soil 50% husk 25% forest soil 25% S4) black soil 50% humus 25% forest soil 25%. Through the phases of seed collection, acquisition and preparation of substrates, design of the shade house, filling of bags, disinfection of substrates, distribution of experimental units, sowing of seeds, weeding, irrigation, counting of twinned seedlings, measurement of height and DAC. In order to determine the best substrate, the following variables were evaluated: Percentage of emergence, height and diameter at collar height (DAC). The analysis of variance and the comparison of means with Tukey's test at a significance level of 5% determined significant differences between the substrates used. According to the results for the percentage of emergence, the best substrate was S2, with the highest value at 60 days after planting, with 81.5%, in P. patula, followed by P. radiata with 80%, but not S4, in which a low germination rate was obtained at 60 days with 30% of emergence in P. radiata and 33% in P. patula, due to the compaction experienced by the substrate in question. In order to increase the percentage of emergence, it is recommended to carry out new studies using S2, certified seed and optimal technical conditions for the propagation of the two species under study.