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Ciência Rural

Print version ISSN 0103-8478On-line version ISSN 1678-4596


VARGAS, Luciano Kayser; SELBACH, Pedro Alberto  and  SA, Enilson Luiz Saccol de. Nitrogen immobilization in soil cropped with maize in sequence to black oats in conventional and in no-till systems. Cienc. Rural [online]. 2005, vol.35, n.1, pp.76-83. ISSN 0103-8478.

The present research aimed to evaluate the amount of nitrogen immobilized and its remineralization, in conventional and in no-till systems, during the corn cycle. A soil that was used for oats crop was seeded with corn and subjected to under conventional and no-till systems. Samples were collected from the top (0-5cm) soil layer on the day of the corn seeding and after 46, 62, 88 and 112 days. At the same time, the aerial parts of corn plants were collected and nitrogen accumulation was evaluated. Soil samples were assayed for mineral N, potentially mineralizable N and C, activity and immobilized N. Microbial nitrogen immobilization was higher in no-till system, reducing the soil mineral nitrogen concentration and resulting in a lower amount of nitrogen in the aerial parts of corn plants at the end of the growth cycle. Nitrogen remineralization was not observed, indicating that the microbial biomass acted more as an agent of organic N mineralization than as a source of potentially mineralizable N.

Keywords : microbial biomass nitrogen; soil tillage; microbial activity; mineral N.

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