Jordao Pigozzo, Ana Tereza [UNESP]Lenzi, Ervimde Luca Junior, Jorge [UNESP]Scapim, Carlos AlbertoVidigal Filho, Pedro SoaresSaraiva da Costa, Antonio Carlos2014-05-202014-05-202008-10-01Acta Scientiarum-agronomy. Maringa: Universidade Estadual de Maringá (UEM), Pro-reitoria Pesquisa Pos-graduacao, v. 30, n. 4, p. 569-579, 2008.1679-9275http://hdl.handle.net/11449/41478The evaluation of micronutrient availability in agricultural soil treated with sewage sludge was developed in Field with maize cultivation on a Dystrophic Red Latosol. The experiment used a randomized complete block design, with the treatments in a split-plot scheme, in time, with six doses of sewage sludge (main-plot treatment) in relation to the five sampling periods for the soil (subplot treatment), with four replications. The sewage sludge was applied in the superficial layer (0-20 cm). The micronutrients Fe, Cu, Mn and Zn were extracted from the soils using a DTPA (diethylenetriaminepentaacetic acid) solution. The same micronutrients were analyzed in the plant tissue after the nitric-perchloric decomposition of the maize samples by spectrometric atomic absorption. The results showed an increasing amount of Fe, Mn, Zn, Cu, Cation Exchange Capacity (CEC) and a decreasing pH in the soil. The increasing doses of sewage sludge increased the Fe, Mn, Cu and Zn availability in the soil solution, and the uptake amount by maize plants were always greater than the control values.569-579porsewage sludgemicronutrient availabilitymaizetropical soilArtigo10.4025/actasciagron.v30i4.5320S1807-86212008000400018WOS:000260939400018Acesso abertoS1807-86212008000400018.pdf