Abstract
Abstract The effect of hydrogel (0, 3, 6, and 9 g per seedling) on the survival and growth of Cariniana pyriformis seedlings under different water regimes (absence of irrigation, 60% and 100% field capacity) in a sandy loam soil was assessed. The experiment was carried out in an agricultural nursery with drip irrigation, implementing a completely randomized block design in a split-plot scheme. After 20 weeks of evaluation in both treatments with irrigation, the maximum dose showed a slight increase (9%) in stem diameter and seedling height compared with the control treatment, although the aerial and root dry biomass did not show differences. For the treatment without irrigation, the survival had a linear response with increasing doses, from 24% (0 g per seedling) to 65% (9 g per seedling). C. pyriformis responds positively to hydrogel when a severe water deficit occurs.
Highlights
AND OBJECTIVESCurrently, the policies and regulations that govern the activities related with the use of wood in Colombia have been insufficient to counteract illegality, indiscriminate use, and the scarce organization in the commercialization of timber species (PROFOR, 2017)
The increase in height and stem diameter over time showed an interaction between the two factors evaluated
After 20 weeks since the transplant, the application of 9 g per seedling increased the values of stem diameter (+ 14%; 7.8 to 8.9 mm) and height (+ 4%; 93.5 to 97.2 cm) compared to the control treatment in the water regime with 60% field capacity (FC). This slight positive effect of the hydrogel was similar in the water regime with 100% FC for stem diameter (+ 4.1%; 9.0 to 9.4 mm) and height (+ 8%; 100 to 108 cm), respectively
Summary
AND OBJECTIVESCurrently, the policies and regulations that govern the activities related with the use of wood in Colombia have been insufficient to counteract illegality, indiscriminate use, and the scarce organization in the commercialization of timber species (PROFOR, 2017). Due to the properties of its wood, such as hardness and resistance to weathering, the abarco is of high economic value and has been widely exploited, which has led it to be categorized locally as Critically Endangered (CR) (Salinas & Cárdenas, 2007; Cárdenas et al, 2015), and globally as Near Threatened (NT) (IUCN, 2019). In this regard, its conservation in agroforestry systems with cocoa has been promoted as a strategy to improve the production of this crop (Agudelo-Castañeda et al, 2018; Suarez et al, 2018). C. pyriformis is distributed from northwestern South America to Venezuela (Prance & Mori, 1979; Mori et al, 2019)
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