Abstract
ABSTRACT In areas where soil surface horizons were removed, the main edaphic problems are reduced amounts of organic matter and nutrients. Revegetation, especially with native species, has been indicated to recover these areas. Under this perspective, the present research has been developed to evaluate the contribution of organic and agro-industrial residues, as conditioners of soil fertility and their effects on initial growth of 'Jatobá-do-cerrado' seedlings. The treatments consisted of 4 agro-industrial residue doses (0, 15, 30 and 45 Mg ha-1) and 4 organic residue doses (0, 8, 16 and 32 Mg ha-1), with 16 treatments and 10 replicates. After 8 months of development, the soil was evaluated for phosphorus, organic matter, hydrogen potential, potassium, calcium, magnesium, potential acidity, aluminum and sum of bases, and plants were evaluated for leaf chlorophyll, height, collar diameter, fresh and dry matter of shoots and roots, and root length. The addition of residues to the degraded soil increased the fertility by raising calcium and magnesium levels. Agro-industrial residues contributed to increasing height, shoot dry matter and chlorophyll of H. stigonocarpa, while organic residues improved shoot fresh matter and chlorophyll.
Highlights
With the growing occupation of the Cerrado, the increase in degraded areas is inevitable and nowadays only part of its original cover is left
With the presence of macrophytes and ash without adequate destination in the region, the need for the recovery of degraded areas with subsoil exposure in the Cerrado and the availability of H. stigonocarpa seeds, this study aimed to evaluate the contribution of organic and agro-industrial residues as soil fertility conditioners and their effects on the growth of seedlings of Hymenaea stigonocarpa Mart. ex Hayne
The results show that both the application of agro-industrial residue (AR) and organic residue (OR) influenced soil fertility with interaction of effects for all the analyzed variables, except for K+ (Table 1), which evidences the importance of the association of organic and mineral materials to improve soil fertility conditions (Medina et al, 2010; Aranda et al, 2015)
Summary
With the growing occupation of the Cerrado, the increase in degraded areas is inevitable and nowadays only part of its original cover is left. Researches on the recovery of degraded areas are still incipient and scarce (Durigan et al, 2011). The low contents of organic matter and nutrients in degraded areas hamper the establishment of vegetation (Rodrigues et al, 2007). Planting seedlings and establishing/ maintaining natural regeneration, or the combination of both, according to Durigan et al (2011), are methods used in the recovery of degraded or disturbed environments. For the introduction of vegetation in degraded soils with low natural fertility and under demarked rainfall regime, it is essential to use mineral and organic inputs (Corrêa et al, 2010) and the use of organic residues may be indicated as a viable option Revegetation allows the production and introduction of organic matter in the soil, which favors multiplication, diversification of microbial community and the reestablishment of the interrelationship of the vegetation with soil morphology, chemistry and biology (Pulleman et al, 2008).
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