Resumo

AGUILERA RODRIGUEZ, Manuel; ALDRETE, Arnulfo; MARTINEZ TRINIDAD, Tomás  e  ORDAZ CHAPARRO, Víctor Manuel. Production of Pinus pseudostrobus Lindl. with sawdust substrates and controlled release fertilizers. Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.34, pp.7-20. ISSN 2007-1132.

Pine sawdust has been utilized for plant production in forest nurseries with promising results. The objective of the present study consisted in proving the effectiveness of two substrates of these materials and two controlled release fertilizers. Pinus pseudostrobus was produced in polystyrene trays with 77 cavities, with: S1 (60, 15, 15, and 10 % weathered pine sawdust, composted pine bark, peat moss and vermiculite), and S2 (60, 15, 15 and 10 % fresh pine sawdust, composted pine bark, peat moss and vermiculite), besides two fertilizers with two nutrient release periods: Multicote® (18-6-12, 8 and 4 months) and Osmocote Plus® (15-9-12), applied during 8 to 9 months and during 5 to 6 months), with a single dose of 8 g L-1 of substrate. A wholly random design with 12 treatments and four repetitions was used. In every case, good quality plants were obtained, with a diameter of over 5 mm, a height of 22 to 25 cm, and a Dickson’s quality index above 0.7. The values of the morphological variables were equal in both strata, except for the dry root weight, which was higher in substrate S2. Overall, Osmocote® had higher values than Multicote®, except for the height variable. It was concluded that pine sawdust is useful as a substrate, and the use of a combination of fertilizers with various release periods proved to be more effective than the application of a single fertilizer.

Palavras-chave : Pine sawdust; plant quality; Multicote^®; Osmocote^®; Pinus pseudostrobus Lindl.; root pruning.