Efeito da incorporação de polímeros hidroabsorventes na retenção de água de dois solos
Ao longo dos tempos, têm se buscado alternativas para aumentar a disponibilidade de água para as plantas. Devido à capacidade de absorver e reter água, os polímeros hidroabsorventes surgiram como uma possibilidade de contribuição para a solução do problema. Este trabalho objetivou avaliar o efeito d...
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Universidade Federal de Viçosa
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|Citação:||REZENDE, Lucimar Silva. Efeito da incorporação de polímeros hidroabsorventes na retenção de água de dois solos. 2000. 74 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Viçosa, Viçosa. 2000.|
|Resumo inglês:||Along the times, alternatives to increase water availability to plants have been sought. Due to the capacity of absorbing and retaining water, hydro-absorbent polymers have arisen as a possibility of contribution to the solution of this problem. The objective of this work was to evaluate the effect of two hydro- absorbent polymers used as soil conditioners: Terracottem and Hidratassolo. The studies consisted of obtaining curves representative of water retention in two soils classified as a sandy-clayey-loamy Red-yellow Latosol and the other as a clayey Red-yellow Podzol, with addition of hydro-absorbent polymers in different concentrations. Three experiments were carried out in order to obtain the curves representative of water retention: experiment one, with incorporation of seven particle-sizes and five concentrations in each soil; experiment two, with incorporation of five concentrations of Terracottem in each soil; and experiment three, in which the curves were obtained from the seven particle-sizes of Hidratassolo and from the Terracottem commercial particle-size, without mixing with soils. The evaluation of change in water retention characteristics was based in the values of total available water in the soil, field capacity and permanent wilting point. It was concluded that, water retention in the two soils increased with the diameter of the Hidratassolo particles and the concentration of the two polymers. Hidratassolo retained more water than Terracottem on a dry-weight basis. The tension of 1,5 MPa was not enough to eliminate all the water retained in the polymers, making the moisture level of the treated soils higher than the control in the wilting point. Hidratassolo was more effective for water retention in the clayey soil. The high absorption capacity and water retention by the polymers at low tensions indicate that they can reduce water losses by percolation and, also at high tensions, the water deficit in crops cultivated in dry periods of the year.|