Avaliação das alterações nos atributos físicos e químicos de um latossolo vermelho-amarelo submetido à aplicação de água de reúso / Evaluation of changes in physical and chemical attributes of a red-yellow latosol submitted to the implementation of water reuse

AUTOR(ES)

Antonio Claudio Testa Varallo

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

10/12/2008

RESUMO

The use of treated sewage effluent to save the ponds used for irrigation has been of great interest in agriculture, and the unregulated use of this practice can cause changes in physical and chemical behavior of the soil. This practice has been of great interest in view of reducing the quantity of water withdrawal from the springs and its preservation, avoiding the contamination of water bodies, these receptors normally drains. The objective of this work is to evaluate the physical and chemical parameters of a Red-yellow dystrophic Latosol after the implementation of water reuse. Thus, two experiments were conducted: the first in the laboratory, where in a column of soil were applied first 15L of distilled water, then more 15L of water reuse from a wetland treatement for domestic sewage. In each 5L of water application a sample of the water passed throught the columm was collected for analysis. The second experiment was conducted in a condition of a greenhouse where they were grown two rounds of curly lettuce (Lactuca sativa, L) with 2 treatments with 3 repetitions each: witnesses (Tst1, Tst2 and Tst3) and reuse (RSA, RSB and RSC ). The results showed that in both experiments there were decreased in some chemical parameters of fertility indicating a possible retention by ground or by culture. There was a decline in hydraulic conductivity of soil and increase the electrical conductivity of soil saturation extract. It also noted a reduction of the soil pH and increases the values of manganese, in addition to increasing the values of SAR and ESP. Thus we can conclude that the application of water reuse on the soil for agricultural purposes should be in a rational way, and the elevation of salts in the soil must be monitored.

ASSUNTO(S)

água de reúso salinidade sodicidade water reuse water salinity sodium ciencia do solo

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