03.1 - Graduação (UAST)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2926
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Item Modificação do uso da terra e seus impactos sobre o fósforo e carbono orgânico do solo no semiárido de Pernambuco(2021-11-26) Silva, Luiz Filipe dos Santos; Pessoa, Luiz Guilherme Medeiros; http://lattes.cnpq.br/1540664578909440; http://lattes.cnpq.br/5391115086399833In the Pajeú sertão, a semiarid region of Pernambuco, the deforested areas of caatinga are intensively used for agricultural cultivation until they deplete soil nutrients such as phosphorus and carbon. until exhausted, and after intensive use of the soil, these areas are abandoned and/or used for grazing animals. Thus, this work aimed to evaluate the dynamics of phosphorus and soil organic carbon under different conditions of land use, in the semiarid region of Pernambuco. Samples were taken in layers of 0-5, 5-10, 10-15 and 15-20 cm of soil under different land use situations: degraded pasture, regenerating caatinga and preserved caatinga. To characterize the chemical attributes of the soils, pH in water (1:2.5), exchangeable cations (Ca2+, Mg2+, Na+ and K+ ) were analyzed, in addition to available phosphorus and organic carbon. The evaluations showed a decrease in the phosphorus content of the surface layer, which was due to the processes of soil degradation generating a lack of nutrients, and the phosphorus content is being made available in the soil as there is a decrease in the levels of Na+ , Mg2+, pH and CTC. Therefore, the degradation of the area and land use without proper management provided an increase in Ca2+ and Mg2+, interfering with the availability of organic carbon, with a high CTC in the three areas. The pH and sodium showed a negative correlation, thus showing an increase in organic carbon as the area is preserved and a decrease with degradation. So, we warn that inadequate soil management can contribute to the loss of important nutrients to the soil such as phosphorus making it unavailable to plants and organic carbon, so it is important to emphasize that many years are needed for the recovery of phosphorus and organic carbon contents, this highlights the importance of preserving native vegetation in the semiarid region of Pernambuco and other northeastern states that belong to the caatinga biome.Item Degradabilidade ruminal do genótipo de capim-elefante Mott(2019) Sobral, Gilberto de Carvalho; Souza, Evaristo Jorge Oliveira de; http://lattes.cnpq.br/0510969297765295; http://lattes.cnpq.br/7753384548343497The objective of this study was to evaluate the disappearance of dry matter and estimate the potential and effective degradation of elephantgrass Mott genotype along different passage rates (2, 5 and 8% / hour) in sheep kept in the Caatinga area. The experiment was carried out in the UAST / UFRPE Ruminants Sector, with a duration of 20 days, 15 for adaptation and 5 for incubation. Three rumen-fistulated Santa Inês crossbred sheep with an average body weight of approximately 60 ± 2 kg were used. The diet consisted of elephantgrass, cottonseed, maize and mineral salt, with a ratio of 70:30. The material was collected, chopped and pre-dried at 55 ° C for 72 hours. Each set of bags was placed according to the incubation times (0, 2, 4, 6, 12, 24, 48, 72 and 96h) and removed all at once to be washed in running water until the wash water if presented clean and then dried at 55 ° C for 72 hours bags were weighed and the dry matter disappearance determined. To evaluate the disappearance of the dry matter along the incubation times, a randomized complete block design was used in the subdivided plots scheme, so that the treatment effect (Mott genotype) was allocated in the plots and the incubation time in the rumen in the subplots. Data were analyzed by Statistical Analysis Systems (SAS, version 9.1). There was a significant difference (P <0.05) in relation to the disappearance of the dry matter of the Mott elephant genotype grass during the incubation period, reaching its disappearing potential at 72 hours after incubation, after which it stabilized up to 96 hours. In relation to the potential and effective degradability of the dry matter of the Mott elephant grass genotype as a function of the different passage rates (2% / h, 5% / h, 8% / h), there was a significant effect (P <0.05). Mott genotype elephantgrass presented a soluble fraction "a" (28.79%), potentially degradable fraction "b" (47.67%), fraction degradation (b) "c" (5.10%) and non-degradable fraction "ND" (23.54%). Mott elephant grass presents a high proportion of dry matter degradable and is recommended for the production of ruminants.