Decomposition and Nutrient Release from Grass Residue in Tropical Conditions

The use of grasses as ground cover in tropical climate guarantees soil protection against erosion processes, however, its capacity for nutrients mineralization is poorly understood. In this sense, the aim of the study was to evaluate the decomposition of vegetable residues from grasses and the miner...

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Bibliographic Details
Published in:	Communications in Soil Science and Plant Analysis Vol. 53; no. 20; pp. 2766 - 2777
Main Authors:	de Almeida, Gbison Ferreira, de Almeida Neta, Maria Nilfa, Fernandes, Luiz Arnaldo, Sampaio, Regynaldo Arruda, Teixeira, Gustavo Leal, Facco Pegoraro, Rodinei
Format:	Journal Article
Language:	English
Published:	Philadelphia Taylor & Francis 13-11-2022 Taylor & Francis Ltd
Subjects:	avena sp Decomposition Dry matter Grasses Ground cover Millet Mineralization Mineralization rate Nutrient release Nutrients Oats Pennisetum glaucum Residues Soil erosion Soils Sorghum sorghum bicolor Tropical climate Vegetables
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Summary:	The use of grasses as ground cover in tropical climate guarantees soil protection against erosion processes, however, its capacity for nutrients mineralization is poorly understood. In this sense, the aim of the study was to evaluate the decomposition of vegetable residues from grasses and the mineralization of macronutrients in tropical conditions. The study was conducted in a randomized block design with four replications, in a 4 × 9 factorial scheme with four cultural residues: sorghum, millet, black oats, and fallow; and nine evaluation times: 0, 14, 28, 42, 56, 70, 84, 98, and 112 days after setting up the study (DAA), in the field. Vegetable residues were disposed on the soil surface for remaining dry matter (RDM), half-life (t 1/2 ) and mineralization rates. Lower decomposition rates were observed in sorghum and millet residues, with RDMs of 40% and 31% when compared to oats and fallow (17% RDM). Thus, the waste mineralization rates decreased in the following order: fallow = oats > millet > sorghum. The mineralization of macronutrients was considered high and decreased in the following order: K > P > N > C > Mg > S > Ca, corresponding to 96, 88, 88, 80, 76, and 74%. The fallow, millet, oat, and sorghum residues released 84, 17, 225, and 17 kg t −1 of N, P, K, and S, with different mineralization rates. The largest fraction of these nutrients was mineralized in the first 30 DAA, what indicates its potential use in agriculture.
ISSN:	0010-3624 1532-2416 1532-4133
DOI:	10.1080/00103624.2022.2089680