Resumo

RAMEEH, Valiollah; NIAKAN, Maryam  e  HOSSEIN MOHAMMADI, Mohammad. Sulfur effects on sugar content, enzyme activity and seed yield of rapeseed (Brassica napus L.). Agron. colomb. [online]. 2019, vol.37, n.3, pp.311-316. ISSN 0120-9965.  https://doi.org/10.15446/agron.colomb.v37n3.71830.

A field experiment was conducted in a randomized complete block design with four sulfur levels, S0, S1, S2 and S3, including 0, 12, 24 and 36 kg ha-1 (respectively) along with 115 kg N ha-1, to evaluate the economic yield of the rapeseed variety (Hyola401) in Abandankash in the Central District of Sari County in Northern Iran. Parameters such as activity of leaf nitrate reductase, root nitrate content, contents of sugars in leaves and root, root peroxidase activity, and leaf catalase activity as well as seed yield were recorded. The results of the analysis of variance revealed that there were highly significant differences between characters for the majority of the traits such as contents of sugars and nitrate in leaves and root, root peroxidase activity, leaf catalase activity, and seed yield. Due to significant positive correlation between activity of root nitrate reductase and seed yield, increasing this enzyme in roots by sulfur application would have an accelerating effect on rapeseed seed yield. A highly significant positive correlation determined between leaf sugar content and seed yield (0.75**) indicated that increasing levels of sulfur had a direct effect on leaf sugar content, which had an accelerating effect on the weight of seed yield. Sulfur application significantly increased seed yield compared to the control (S0 level), and it ranged from 2744 to 3215 kg ha-1 in S0 and S3.

Palavras-chave : correlation; fertilizer; nitrate reductase; nutrient; variation.

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