The soil proteolytic activity and organic production of corn under the conditions of applying different nutrition systems
2004
Mandic, L.G. | Djukic, D.A. | Stevovic, V.I. (Faculty of Agronomy, Cacak (Serbia and Montenegro))
The effects of increasing amounts of mineral nitrogen (90, 120, 150 kg/ha), liquid (80 t/ha) and solid manures (45 t/ha) those of inoculations with Azotobacter chroococcum (the strain 84) on the soil proteolytic activity and corp yield grown in monoculture were surveyed over the 3-year-long research work. The research results indicated that proteolytic acitivity and corn yield depended highly on the fertilizer sorts, amounts and on the research year, too. Over the first research year, the highest proteolytic activity was recorded on the variants with organic fertilizers, whereas the fertilizer stimulating effect markedly decreased, particularly with liquid manure over the following two years of the research. Mineral fertilizers were also found to remarkably stimulate the biological parameters we have been concerned above, particularly the mean N amount (120 kg/ha). While the highest corn yield could be obtained using 120 kg/ha throughout all the research years, its insignificant rise and barely altered soil proteolytic activity using corn seed inoculation with 84 Azotobacter chroococcum could be noticed.
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