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- Title
Quality and Bioactivity of Humic Substances from Soils Grown with Cover Crops.
- Authors
Sá, M. C.; Campos, A. R. M.; Evaristo, A. B.; Silva, R. S.; Dobbs, L. B.
- Abstract
This study aimed to evaluate the quality of humic substances isolated from soils managed under a no-tillage system cultivated with different cover crops and to verify their biological activities on the growth of maize seedlings (Zea mays L.) in a hydroponic system. Nine different cover crops were grown in the study area giving rise to the different treatments. To obtain the organic matter quality index and proceed with the characterization of humic substances, soil samples from each treatment were collected superficially (0–20 cm). The humic substances were extracted and fractionated and then the material was characterized by chemical and spectroscopic methods. The biological activity of humic substances was evaluated by growing maize seedlings in a hydroponic system whose solutions contained 2.0 mM CaCl2 (minimum medium) supplemented or not (control) with nine different humic substances at a concentration of 6.25%. In general, the use of different cover crops influenced both the quality and the bioactivity of humic substances in soils managed under no-tillage. The soil cultivated with Crotalaria spectabilis stood out for presenting humic substances with a higher degree of humification and chemical stability, as well as for having denoted the best results regarding the growth of corn seedlings.
- Subjects
HUMUS; COVER crops; SOILS; CORN growth; CORN seedlings; SOIL sampling
- Publication
Eurasian Soil Science, 2023, Vol 56, Issue 10, p1420
- ISSN
1064-2293
- Publication type
Article
- DOI
10.1134/S1064229323600240