Eucalyptus Inicial Growth on Humic Cambisol With Application of Limestone, Gypsum, and Lime Mud

Abstract

The high demand for forest products in Brazil estimates a 2 million hectares increase in reforestation areas over the next 10 years, highlighting Eucalyptus species. However, these crops usually occur in acid soils that need correction to achieve high productivity. Besides limestone, lime mud, a residue from the cellulose industry, and gypsum can also be used as correctives, but there are doubts about doses and ways of application with the best results. Thus, were evaluated the soil chemical attributes, foliar nutrient content, and initial growth of a Eucalyptus dunnii Maiden crop in response to the application of limestone, lime mud, and gypsum in different doses and ways of applications, on a Humic Cambisol from Santa Catarina Plateau. The experiment was carried out with nine treatments in four replicates, where the evaluated parameters were determined up to 24 months after planting. In general, both limestone, lime mud, and gypsum, in different doses and ways of application, affected the chemical attributes of the soil but did not affect the foliar nutrient content at 12 months, height, and diameter at breast high (DBH) from trees and timber volume at 24 months. Gypsum do not correct soil acidity but lime mud provides similar results to limestone indicating that can substitute this corrective without damage to nutritional status and initial development of Eucalyptus dunnii.

Eucalyptus Response to the Application of Limestone, Gypsum, and Lime Mud in Humic Cambisol

“…In the experiment in question, however with assessments of DBH, height and estimated volume per hectare at 12, 15 and 24 months of cultivation age, Pfleger et al (2020) observed that for DAP and volume, at 12 months, the limestone applied at a lower dose on the surface in the planting strip (T3) had an increase, in relation to the control treatment (T1). At 15 months, the application of limestone on the surface in the planting strip (T3), and limestone and gypsum on the surface in the planting strip (T6), the DBH and volume increased in relation to the gypsum incorporated in the planting furrow (T9).…”

“…The sources of Ca used in the experiment were dolomitic limestone (PRNT: 56% and moisture: 1%), agricultural gypsum (33% of Ca) and lime mud (PRNT: 87% and moisture: 30.5%) (PFLEGER et al, 2020). The materials gypsum, dolomitic limestone and lime mud used for the experiment were analyzed in an energy dispersion X-ray fluorescence spectrometer.…”