Resumo

GAMBAUDO, Sebastián et al. Uso de efluentes líquidos de tambo para mejorar la productividad de cultivos anuales y la fertilidad del suelo. Cienc. suelo [online]. 2014, vol.32, n.2, pp.197-208. ISSN 1850-2067.

A field experiment was set up in Esperanza (Santa Fe State) in a Typic Argiudoll in order to evaluate the effects of application different quantities of liquid dairy cattle slurry on soil fertility, as a consequence, on the forage productivity and quality. The trial was sown with ryegrass (Lolium multiflorum Lam), and then with sorghum (Sorghum bicolour (L) Moench) according a design completely randomized with tree treatments and tree replications. Chemical characteristics of the dairy cattle slurry were determined to calculate the applications rates. At each time, the applied amounts of manure (treatments) were: 0 (T0), 80.000 (T1) and 160.000 L ha^-1 (T2). Disturbed soil samples were analyzed to determine the macro and micronutrients contents. The dry matter production of ryegrass was determined in four cuts, while in sorghum was performed only one cut. The content of ashes (Cz), total nitrogen (Nt), phosphorus (P), sodium (Na), potassium (K) and calcium (Ca) were determined in the vegetal tissues. The treatments affected significantly the ryegrass and sorghum dry matter productivity, without causing changes in the nutrient contents of the tissues. Alterations of the sorghum morphological composition (relationship shoot, leaves and panicle) were observed, which improved its quality. Soil properties remained unaltered in spite of the high quantities of Nt and Na that were added. This fact indicates the occurrence of important nutrient losses via lixiviation and volatilization that should be monitored.

Palavras-chave : Organic manure, forage productivity, soil chemical properties.

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