Ecophysiology of Hymenaea courbaril L. seedlings in nutritionally deficient situations
DOI:
https://doi.org/10.6008/CBPC2179-6858.2022.009.0012Keywords:
Jatobá, Mineral nutrition, Chlorophyll, Gas exchangesAbstract
Hymenaea courbaril L. popularly known as jatobá, is a native forest essence (NFE) from Brazil with great potential for reforestation projects due to its low nutritional requirements, low water demand, excellent wood quality and attractiveness for fauna’s fruits. However, there is a lack of studies focused on the physiology of NFEs in situations of nutritional stress, and such knowledge will contribute to their ecological conservation. Thus, this study aimed to evaluate the physiological characteristics of H. courbaril seedlings in a deficiency nutritional situation. The completely randomized design was applied in a scheme of seven main plots (seven nutrient solutions), subdivided into two subplots (two growth phases) and four replications, totaling 56 experimental units. The main plots were composed with seven nutrient solutions: complete, containing all essential nutrients; omitting nitrogen or phosphorus, potassium, calcium, magnesium; and omitting all essential nutrients. The subplots consisted of two growth phases, with evaluation at 70 and 126 days after seedling transplantation (DAT). The omissions did not promote changes for most of the physiological characteristics. However, net photosynthesis, stomatal conductance, internal carbon dioxide concentration, instantaneous water use efficiency and intrinsic water use efficiency were higher at 126 DAT.
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