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Changes of soil chemical, microbiological, and enzymatic variables in relation to management regime and the duration of organic farming in Phaseolus vulgaris

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ΤίτλοςChanges of soil chemical, microbiological, and enzymatic variables in relation to management regime and the duration of organic farming in Phaseolus vulgaris
Publication TypeJournal Article
Year of Publication2010
AuthorsEfthimiadou, E., Papatheodorou E.M., Monokrousos N., & Stamou G.P..
JournalJournal of Biological Research
Volume14
Pagination151-159
Publication Languageeng
ISBN Number1790045X
Λέξεις κλειδιάAmidohydrolases, Phaseolus vulgaris, Phosphatases, Plant stage, Sustainable agriculture
Abstract

In this study we investigated the effects of management regime (organic vs conventional) and the duration of organic farming on soil microbial and chemical variables (C- and N-microbial, Cand N-organic, N-inorganic, P-extractable, C- and N- mineralization rate) and on enzymes involved in N- and P-cycle. To meet this goal, sites cultivated organically with Phaseolus vulgaris (L.) for 2, 5, and 14 yrs as well as a conventional one were investigated. Samples were collected at two occasions coinciding to different stages of plant development. Both management regime and the duration of organic farming did not affect significantly the chemical and microbiological soil variables such as microbial C and N, rates of C- and N-mineralization, N-inorganic, P-extractable and C-organic. It seems that, for bean cultivations (bean is an annual plant), the mechanical disturbance of the soil induced yearly by plowing and tillage masked the effects of the repeated addition of organic amendments. On the contrary, enzymatic activities increased with increasing duration of organic farming (from 2 to 14 yrs) and they were higher in the oldest organic site compared to the conventional one. However, although most soil variables did not exhibit significant quantitative differences in various sites, these latter differed in respect to the temporal changes in these variables. The magnitude of temporal changes increased from conventional to the oldest organic site.

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