Understanding the dynamics of decomposition and release of nutrients from plant residues of different covers, in association or succession, is essential to define more sustainable management strategies in tropical soils. The objective of this study was to estimate the decomposition rates and the release of nutrients during the decomposition of different crop residues with different chemical compositions when in association (Mix) or in succession as residue management. A study was carried out with the respective treatments in a (2 × 6) + 1 factorial scheme: (a) without and with the addition of Pennisetum americanum residue (L); and (b) six residue crops (legumes and non-legumes) and one additional treatment with residue of millet only; with destructive samples over time (0; 0.08, 0.25 and 0.41 years after incubation). The treatments were distributed in a randomized block design with four replicates. The plant material was processed, and the contents of macro- and micronutrients were determined. The decomposition rates and release of nutrients from the residues were estimated by fitting nonlinear regression models. Residues of only non-legumes, with the exception of sunflower, tend to accumulate and degrade more slowly, resulting in a slow release of nutrients to the soil. Legume residues are more easily decomposed, enabling faster delivery of the nutrients available to the soil. Despite the faster degradation of legume residues, brown hemp was more resistant to decomposition. A combined supply of legume and non-legume residues favoured a diversified pattern of decomposition and release of nutrients among the different residues studied. The knowledge of the biochemical composition, as well as the dynamics of decomposition and release of nutrients from leguminous and non-leguminous residues, will directly influence the management to be adopted and the functionality of the residues in the soil.

中文翻译：

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热带土壤中豆类和非豆类残留物的分解和养分释放

了解不同覆盖的植物残留物分解和释放养分的动态，关联或连续，对于确定热带土壤中更可持续的管理策略至关重要。本研究的目的是估计在联合（混合）或连续作为残留物管理时，具有不同化学成分的不同作物残留物在分解过程中的分解速率和养分释放。在 (2 × 6) + 1 阶乘方案中对各自的处理进行了一项研究：(a) 没有和添加了美洲狼尾草残留物（L）；(b) 六种剩余作物（豆类和非豆类）和一种额外的仅用小米剩余的处理；随着时间的推移（0；孵化后 0.08、0.25 和 0.41 年）的破坏性样本。处理以随机区组设计分布，具有四次重复。处理植物材料，并测定大量和微量营养素的含量。通过拟合非线性回归模型估计残留物的分解速率和营养物质的释放。除向日葵外，只有非豆类的残留物往往会更缓慢地积累和降解，从而导致养分缓慢释放到土壤中。豆类残留物更容易分解，从而能够更快地将可用的养分输送到土壤中。尽管豆类残留物的降解速度更快，棕色大麻更耐分解。豆类和非豆类残留物的联合供应有利于所研究的不同残留物之间营养物质分解和释放的多样化模式。对生化成分的了解，以及从豆科和非豆科残留物中分解和释放养分的动态，将直接影响所采用的管理方法和土壤中残留物的功能。