Abstract
An experiment was carried out with lettuce plants using PVC pots filled with a Cambic Arenosol, in order to define critical application levels of combined primary / secondary pulp-mill sludge to that crop, as well as to study its effect on physical and chemical characteristics of the soil. From the results obtained no yield reduction was observed, in contrast with the results obtained from studies undertaken with the primary sludge, where amounts larger than 50 t ha−1 led to a significant yield reduction. Concerning soil characteristics, significant differences on pH, organic matter and exchangeable sodium percentage values were detected as well as on Ca/Mg ratio.
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© 1993 Springer Science+Business Media Dordrecht
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Cabral, F., Vasconcelos, E. (1993). The use as fertilizer of combined primary/secondary pulp-mill sludge. In: Fragoso, M.A.C., Van Beusichem, M.L., Houwers, A. (eds) Optimization of Plant Nutrition. Developments in Plant and Soil Sciences, vol 53. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2496-8_13
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DOI: https://doi.org/10.1007/978-94-017-2496-8_13
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