Resumo

RUBIO, Gerardo; SCHEINER, Javier D; TABOADA, Miguel A  e  LAVADO, Raúl S. Distribution of nitrogen, phosphorus and sulfur in oilseed rape: effects on nutrient cycling. Cienc. suelo [online]. 2007, vol.25, n.2, pp.189-194. ISSN 1850-2067.

Oilseed rape poses a higher sulfur (S) demand, compared to other crops. This may indicate that the inclusion of this crop in the crop rotation could accelerate soil S depletion. In this work, we compared the allocation of biomass, nitrogen (N), phosphorus (P) and S in oilseed rape mature plants. Two factors were analyzed in a field experiment: nitrogen and sulphur (two levels for each factor). At harvest, we measured the accumulation of biomass, N, P and S in three compartments: roots, straw and grains. Yield was little affected by the addition of single nutrients but the simultaneous addition of N and S caused a 56% increase in this parameter. Nitrogen and P showed a rather similar allocation pattern. Sulfur, conversely, showed a lower allocation to grains and a higher allocation to straw than the other two studied nutrients. The lower allocation to the harvested organ would attenuate the effect of the high demand of S of this crop on the nutrient balance and would also allow a re-utilization of the S fertilizer by the following crop.

Palavras-chave : Fertilization; Nutrient balance; Canola; Mineral nutrition.

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