Resumo

TORRES DUGGAN, Martín et al. Supplementary irrigation in a typic Argiudoll of the Argentine Rolling Pampas under no-tillage: effects on soil physical and chemical properties. Cienc. suelo [online]. 2012, vol.30, n.2, pp.201-207. ISSN 1850-2067.

Supplementary irrigation increases and stabilizes crop yields. However, when irrigation water of poor quality is applied, it can adversely affect soil properties. The objective of this study was to: evaluate the influence of supplementary irrigation on some physical and chemical properties under no- till cultivation systems. A field experiment was performed on a loamy Typical Argiudoll, managed under no- tillage. The treatments were: 1-Irrigated soil during 13 years, 2-Adjacent Rainfed soil. Soil chemical (pH, electric conductivity, exchangeable sodium percentage, organic carbon, total N, exchangeable cations, cation exchange capacity, extractable P) and physical properties (infiltration rate, soil penetration resistance, bulk density, gravimetric water content, structural instability) were evaluated. Irrigation significantly increased the pH and exchangeable sodium percentage (P 2Mpa) in both treatments, probably due to the effects of the cultivation and harvest machinery under high soil water contents. The soil structural instability was very low (i.e. high structural stability) in both treatments, probably associated to the high organic matter content and the no- till cultivation system.

Palavras-chave : Irrigation; Physical properties; Chemical properties; No tillage.

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