CALAGEM E SILICATAGEM EM SOLO INCUBADO COM DIFERENTES UMIDADES

Abstract

The lime is theacidity correctivemore used inbrazilian agricultural soils, but important benefitscan be obtained fromcalcium and magnesiumsilicates. The aim ofthisstudy was to comparethe effectofneutralizingsoil aciditybyapplication of lime andsilicate, with incubationof the correctivesin soil conditionsmore orless moisture. The experiment was conductedin the Soil Chemical Analysis Laboratoryat the UNOESTE, using soil collected in the layer0-20cmof a Sandy Loam Argisol. The experiment was carried out in acompletely randomizedina 2x2x5 factorial scheme, with twocorrectives(lime and silicateof Ca andMg), twosoilmoistures(80 and20% moisturesoil saturation) and five times (60, 90, 120, 150 and180 daysafter incubation) ofsoil chemical properties. It was submitted to variance analysis and the effects of soil moisture and correctives were evaluated by Tukey test (p<0,05) and the incubations time were evaluated by regression analysis.The silicatehas a higherneutralizing capacityof soil aciditythan lime, and thusits dosageshould be further investigated, because the use of the calculationto determine thelime requirementcan overestimatethe need forsilicate applied. The lime reactivity in the soil is not influenced with soilmoisturebetween 20and 80% moisturesaturation, unlike silicate,which has itssoilreactivityenhancedin thecondition ofhigher moisture.Thesoil corrective actionacidityby bothcorrectiveremainsincreasingup to 180days ofincubation,however,satisfactory resultsare alreadyobtainedwith 60days ofsoil incubation