03.1 - Graduação (UAST)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2926
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Resultados da Pesquisa
Item Infiltração e redistribuição da água em solos irrigados por gotejamento: caracterização do avanço da frente de molhamento(2019-07-26) Amaral, Erison Martins; Souza, Eduardo Soares de; http://lattes.cnpq.br/8125009165007422; http://lattes.cnpq.br/0203403737626492Water efficiency makes dripping the most expansive irrigation system in modern world agriculture. One of the observable characteristics in drip irrigated soil is the wetness front. The use of mathematical models to estimate the dimensions of this front is important for the design of drip systems, using the saturated hydraulic conductivity (KS) of the soil as a parameter of adjustment and calibration. The Beerkan semiphysical method determines the hydrodynamic properties of the soil, among them, KS. Thus, this work aimed to investigate the relationship between the advance of the soil wetness front in a drip irrigation system and with a semi-physical method. The experiment was carried out at UFRPE/UAST, irrigating two soils (FAr and FAAr), through three driping irrigation systems, with three different flow rates (2.8, 4.4 and 8.3 L h-1) for ten intervals of time (5, 10, 15, 20, 30, 40, 50, 70, 90, 110 min.). The measured dimensions were diameter (d) and depth (p), given in centimeters (cm). Soils FAr and FAAr obtained similar values for the observed dimensions (d and p). The best time irrigation responses for the Soil FAr were found for the 8.3 L h-1 flow for 30 min of irrigation for (d), and 8.3 L h-1 for 50 min for (p). In the FAAR soil, the best responses were flow 8.3 L h-1 for 50 min and flow 8.3 L h-1 for 70 min for (d) and (p), respectively. It was possible to estimate the geometrical dimensions of the wetness front, diameter and depth from the Ks obtained from the Beerkan methodology. The estimated dimensions from Ks obtained a positive correlation with the observed dimensions, with R2 > 0.90 for all correlations. The adjusted equations can be used to estimate the area and volume of wet soils for all flows at any time interval.Item Fracionamento físico do carbono no solo em função da irrigação e adubação nitrogenada(2019) Espindola, Vitor Augusto Silva; Oliveira, Alexandre Campelo de; http://lattes.cnpq.br/8164135937542569; http://lattes.cnpq.br/4334208597286391Variations in the carbon stock are not individual risk factors, these are natural and anthropic, as the natural islands are associated as characteristics of the region, such as climate and temperature of the region, the characteristics of textures, soil C concentrations. The anthropological factor is related to the performance standards of a strategy of changing characteristics of a business that is not before, such as the process of doing its initial business, the struggle for machines and leaching through an irrigation action. Such classes can be occasioned in reducing C concentrations in soil as a problem of soil quality, since this is a resource as a non-renewable resource. Because of this, a number of studies are focused on measuring stock concentrations through practical actions in a way that can lead to loss of inventory. From the total zero hours, from the total hours, from the zero. in the semi-arid region of Pernambuco. The experiment was conducted at the Serra Talhada Academic Unit (UAST) under field conditions, with a randomized block design, evaluation of forage sorghum and millet in consecutive cycles, applied to 4 irrigation slides (28, 36, 44 and 52 %). and 4 levels of nitrogen fertilization (0, 100, 200, 300 kg ha-1). In terms of results, the analysis of the needs of all cycles was made during the first year, showing the potential of applying the local experimental impact in its dynamics. There is a relationship between the COAM and the nitrogen so that an increase of its bases by the provision of soil N alone in the first cycle. There is a reduction in COP concentrations as a first time when doing a man's action when he does not interfere in the other. So, a dynamics of C not having alone in contact with the fact of being under the effect of nitrogen fertilization and irrigation, does not offer significant effects of the interaction between the two on TOC, but rather the action of both managements isolated form. Studies on the higher depths may also be needed because of soil characteristics.Item Eficiência do uso da água e nutrientes da palma forrageira sob diferentes regimes hídricos e sistemas de plantio(2018) Assís, Méry Cristina de Sá; Silva, Thieres George Freire da; http://lattes.cnpq.br/0213450385240546; http://lattes.cnpq.br/6998116555134928Forage cactus is a crop widely used in Brazilian semi-arid region animal production systems, since it presents great adaptation to this region. Thus, the objective of this work was to analyze water efficiency and nutrient use of forage cactus submitted to different water regimes and planting systems. The experiment was carried out in Serra Talhada - PE, from 11/2014 to 11/2015, with "Orelha de Elefante Mexicana" clone forage cactus and cv. SF-15 forage sorghum distributed in randomized blocks, with 4 replications, in a 5x4 factorial arrangement, with five water blades (0%, 25%, 50%, 75% and 100% of reference evapotranspiration - ETo) and four planting systems (exclusive forage cactus, exclusive sorghum, forage cactus-sorghum consortium and palm with cover. The crops productivity was obtained at harvest time and then, efficiency indicators of water use were calculated relating crop productivity in water blade systems, and nutrient use efficiency, relating nutrient productivity to water blades. There was no interaction between water slide and water and nutrient efficiency planting systems use for N, P, K, B, Mn, Zn and Na, however it was observed that higher efficiency of water use at water blades occurred in dry or irrigated condition based on ETo 25% and between the systems, exclusive forage cactus has lower efficiency. In relation to nutrients when influenced by slides under lowest water conditions (dryland and ETo 25%) highest efficiencies are obtained, and when it comes to planting system exclusive forage cactus has the lowest efficiency. There was interaction between water blade and planting system for nutrient utilization Ca, Mg, S, Cu and Fe, being observed a greater influence of the planting system than of water blade system. Considering the water use efficiently based on dry matter, even when there was no interaction between planting systems and water blades, forage cactus planting, forage cactus intercropped with sorghum and forage cactus with cover systems are more efficient than exclusive forage cactus since forage cactus should not be fed to animals as an exclusive diet, the forage cactus-sorghum consortium becomes an efficient alternative to overcome this limitation. The application of 208.3 mm of complementary water distributed regularly during greatest deficit period promotes an increase in forage cactus green matter yield and green and dry sorghum matter. It is indicated its use mainly in forage cactus- sorghum system, since the sorghum has less water use efficiency. Mulching use, consortium with sorghum, as well as complementary irrigation with 208.3 mm in forage cactus cultivation Opuntia stricta (Haw.) Haw., are efficient strategies to promote forage production improvements. The Mulching use promotes greater extraction of nutrients by forage cactus, as well as promotes increased productivity.