Lixiviação de nutrientes em lisímetros de drenagem na presença de polímero hidroabsorvente.

Abstract

The objective of the present work was to evaluate the leaching of nutrients applied in soils in coriander cultivations, in conditions drainage of lisimeter, by utilizing a hidrogel polymer named Hidratassolo®. The study was done in an experimental station built in the Tecnologia Rural Department of Universidade Federal Rural de Pernambuco, located in the municipal district of Recife–PE during february to march 2006. The coriander cultivation was grown in a field atmosphere, with two irrigation levels related to estimated evapotranspiration (Tank Class "A" method 0.6.ETo and 1.20.ETo in mm), applied on two day irrigation frequencies, and five hidratassolo doses (0; 4; 8; 12 and 16 dg.kg-1). The experiment design consisted of randomized blocks in split-plots, with simple regression analysis. The characteristics appraised were pH, the electric conductivity (CE), measured in (dS.m-1), and the leached nutrients: calcium (Ca2+), magnesium (Mg2+), sodium (Na+), potassium (K+), in (mmolc dm-3), and the drained (VAD), evaluated volume of water in the diverse hidrics balance (T), to the long one of the period of cultivations. With the increasing of the biggest blade the levels of hidratassolo had linearly reduced the concentrations of calcium, magnesium, potassium and the electric conductivity while that it linearly raised the sodium concentration and the value of pH of the effluent. Besides, the use of the lesser blade linearly raised the concentrations of potassium, calcium, magnesium and the electric conductivity, and reduced the sodium concentration and the value of pH of the drained material. With relation to the effect of the treatments to the long one of the time, the studied levels of blades had increased the concentration of sodium, potassium and the value of pH and had reduced the concentration of calcium, magnesiumand the electric conductivity, in the drained material, inside of the levelsof hidratassolo.