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Pesquisa Agropecuária Brasileira

versão impressa ISSN 0100-204Xversão On-line ISSN 1678-3921

Resumo

DRESCHER, Gerson Laerson et al. Nitrogen availability for flooded rice by the direct steam distillation method. Pesq. agropec. bras. [online]. 2016, vol.51, n.3, pp.243-252. ISSN 1678-3921.  http://dx.doi.org/10.1590/S0100-204X2016000300006.

The objective of this work was to evaluate the ability of the direct steam distillation (DSD) method to extract alkaline hydrolyzable nitrogen fraction in the soil and to predict N availability in rice paddies. Twenty-five soil samples were collected at the 0-20-cm soil depth, with contrasting texture and contents of soil organic matter. The mineralization of N by anaerobic incubation was determined in a laboratory, and leaf-N content and N accumulation by rice plants were obtained in a greenhouse by simulating flooding conditions in pots. These variables correlated with N extracted by the DSD method. Soil-N contents obtained with the method, as well as available N after 28-day anaerobic incubation and N accumulated by rice plants after 45 days, showed high values. The evaluation of a more labile N fraction by the DSD method improves the estimation of N availability, in comparison to methods that only assess soil organic matter contents, which indicates that the DSD method has potential for evaluating N availability in rice paddies.

Palavras-chave : Oryza sativa; nitrogen fertilization; soil analysis; soil fertility evaluation; anaerobic incubation; soil organic matter.

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