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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Sodicity and salinity in a Brazilian Oxisol cultivated with sugarcane irrigated with wastewater

Texto completo
Autor(es):
Pereira Leal, Rafael Marques [1, 2] ; Herpin, Uwe [2] ; da Fonseca, Adriel Ferreira [3] ; Firme, Lilian Pittol [1, 2] ; Montes, Celia Regina [2, 4] ; Melfi, Adolpho Jose [1, 2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, ESALQ, Dept Ciencia Solo, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Sao Paulo, NUPEGEL, BR-13418900 Piracicaba, SP - Brazil
[3] Univ Estadual Ponta Grossa, Dept Ciencia Solo & Engn Agr, BR-84030900 Ponta Grossa, PR - Brazil
[4] USP, Lab Geoprocessamento & Tratamento Imagens, CENA, BR-13400970 Piracicaba, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Agricultural Water Management; v. 96, n. 2, p. 307-316, Feb. 2009.
Área do conhecimento: Ciências Agrárias - Agronomia
Citações Web of Science: 58
Assunto(s):Pedologia   Solo tropical   Reúso da água   Cultivos agrícolas   Cana-de-açúcar   Saccharum
Resumo

Changes in soil sodicity–salinity parameters are one of the most characteristic alterations after treated sewage effluent (TSE) irrigation in agro-systems. Considering the importance of these parameters for agricultural management, as well as the economical value of sugarcane for Brazil, the present study aimed at evaluating effects on soil sodicity and salinity under tropical conditions over 16 months of TSE irrigation in a sugarcane plantation at Lins, São Paulo State, Brazil. Soil samplings were carried out in February 2005 (before planting), December 2005 (after 8 months of TSE irrigation) and September 2006 (after 16 months of TSE irrigation) following a complete block design with four treatments and four replicates. Treatments consisted of: (i) control, without TSE irrigation; (ii) T100, T150 and T200, with TSE irrigation supplying 100% (0% surplus, total of 2524 mm), 150% (50% surplus, total of 3832 mm) and 200% (100% surplus, total of 5092 mm) of crop water demand, respectively. Compared to initial soil conditions, at the end of the experiment increases of exchangeable sodium (from 2.4 to 5.9 mmolc kg−1), exchangeable sodium percentage (ESP) (from 8 to 18%), soluble Na (from 1.4 to 4.7 mmol L−1) and sodium adsorption ratio (SAR) of soil solution (from 3.6 to 12.6 (mmol L−1)0.5) were found in the soil profile (0–100 cm) as an average for the irrigated plots due to high SAR of TSE. Associated with the increments were mostly significant increases in clay dispersion rates at depths 0–10, 10–20 and 20–40 cm. Electrical conductivity (EC) of soil solution increased during the TSE irrigation period whereas at the end of the experiment, after short term discontinuation of irrigation and harvest, EC in the topsoil (0–10 and 10–20 cm) decreased compared to the previous samplings. Moreover, despite increasing sodicity over time mainly insignificant differences within the different irrigated treatments were found in December 2005 and September 2006. This suggests that independent of varying irrigation amounts the increasing soil sodicity over time were rather caused by the continuous use of TSE than by its quantity applied. Moreover, also plant productivity showed no significant differences within the TSE irrigated plots. The study indicates that monitoring as well as remediation of soil after TSE irrigation is required for a sustainable TSE use in order to maintain agricultural quality parameters. (AU)

Processo FAPESP: 04/14315-4 - Uso de efluentes de esgotos tratados por processos biológicos (lagoas de estabilização e reatores UASB/lodos ativados) em solos agrícolas
Beneficiário:ADOLPHO JOSÉ MELFI
Linha de fomento: Auxílio à Pesquisa - Temático