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Effect of organic fertilizers on survival, growth, chlorophyll and NDVI of Aniba rosaeodora Ducke plants in the Peruvian Amazon

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https://ir.library.oregonstate.edu/concern/graduate_projects/00000745s

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  • Aniba rosaeodora commonly known as rosewood is a tree species of great socio-economic value in the Amazon because it is harvested for the extraction of its essential oil, which is used in the production of cosmetics. Since rosewood is a wild species included on the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) list of vulnerable species, initiatives have arisen with the objective of domesticating it in plantations to guarantee its survival and sustainable extraction of its essential oil. However, the silvicultural practices of nutrient addition to promote its growth and development in its initial stage of development remain little studied. The aim of this study was to make a comparative analysis of the response of the survival, growth, chlorophyll index and NDVI of rosewood seedlings planted with two organic fertilizer and a control treatment. The control treatment included plants planted with the soil extracted from the planting hole. Treatment 1 involved the combination of 1 kg of earthworm humus plus 1 kg of decomposed sawdust into the planting hole, while treatment 2 included the addition of 1 kg of earthworm humus plus 1 kg of topsoil obtained from the study area into the planting hole. The experimental design was completely randomized. Descriptive and inferential statistics (ANOVA and Kruskal-Wallis) were used for data analysis, and graphs of monthly variations of the variables were generated. Results showed that control treatment had the highest survival rate of 57% (16 out of 28), treatment 1 at 43% (12 out of 28) and treatment 2 at 36% (10 out of 28). Xylosandrus compactus beetles were the main cause of mortality, killing 36% of the plants, while fungi caused 8% of the deaths. In November the height, diameter and number of sprouts in all treatments showed an increase. The number of leaves increased in the control treatment and treatment 2, but decreased in treatment 1. Similarly, chlorophyll index and NDVI values for all treatments declined in November. In November, no significant differences were found for all variables except for the survival variable. Monthly variations of chlorophyll index and NDVI suggest that they are related to climatic factors. These results highlight the need to further study the factors that influence the growth of rosewood plants for its conservation and sustainable management.
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