Abstract
ABSTRACT Liming is beneficial for plants as it promotes pH elevation, neutralization of toxic aluminum, increase in calcium (Ca²+) and magnesium (Mg²+) supply, and provides greater root systems. However, it is known that different species, mainly those native to the Cerrado, respond in different ways to this technique. Given the above, the objective of this study was to determine how Hymenaea stigonocarpa (“Jatobá-do-Cerrado”) seedlings respond to liming in Dystrophic Red Latosol. The plants were cultivated in four-liter pots, submitted to different base saturation (natural soil, 30, 45, 60 and 75% V) and maintained in a greenhouse. Biometrics, biomass, nutritional content and physiological parameters were evaluated. A difference in Ca²+ and Mg²+ contents between leaves and stems was observed, leading to significant reductions in stomatal conductance, transpiration, internal CO2 concentration and internal and external CO2 concentration ratios, resulting in a reduction of the investment in growth and biomass. Given these results, there is no need for liming in the production of H. stigonocarpa seedlings in a Dystrophic Red Latosol.
Highlights
Low fertility and nutrient availability, problems such as soil acidity and aluminum toxicity limit plant productivity, preventing plants from reaching their full potential (Rao et al, 2016)
Liming increases base saturation and calcium and magnesium availability, while phosphorus and molybdenum fixation which are reduced by the inactivation of reactive constituents and toxicity due to excess soluble aluminum, iron and manganese, is corrected, promoting root growth and improving nutrient absorption (Agegnehu et al, 2019)
These studies indicate that species from different ecological groups present positive to liming responses, and that this result is only obtained for plants classified as pioneers and secondary species (Furtini Neto et al, 1999)
Summary
Low fertility and nutrient availability, problems such as soil acidity and aluminum toxicity limit plant productivity, preventing plants from reaching their full potential (Rao et al, 2016) To correct these factors, liming is practiced. Liming promoted negative responses to seedling growth in Plathymenia foliolosa Benth and Dimorphandra mollis Benth (Freitas et al, 2017b; Cota et al, 2019), while positive response was noted in Dalbergia nigra (Vell.) Allemão ex Benth (Carlos et al, 2018). These results indicate that forest species may respond in different ways
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