Resumen

OLIVEIRA, Simone Cristina de et al. Response of two rice cultivars to rates of zinc applied as oxysulfate. Pesq. agropec. bras. [online]. 2003, vol.38, n.3, pp. 387-396. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2003000300008.

The objective of this work was to evaluate the effect of doses of Zn oxysulfate in granular and powder forms on two rice cultivars in a Red Latosol (Hapludox). The trial was carried out in a greenhouse in pots with 3 dm³ of soil. Lime, macronutrients and micronutrients except Zn were applied in all pots. Zinc rates were 0, 1, 2, 5 and 10 mg dm^-3 of soil. Four mg Zn dm^-3 were used as a standard source of this nutrient. A completely randomized design with four replicates was used. Powder oxysulfate in the cultivar IAC 165 and the granular one in IAC 202 resulted grain yields similar to those obtained with Zn sulfate used as standard. There were differences in the Zn concentration in leaves and culms of the cultivars as associated to the higher grain production. IAC 202 was more efficient in the use of Zn for vegetative growth and grain yield. Available soil Zn extracted either by Mehlich 1 or DTPA showed significant correlation with the doses of Zn applied and with the Zn tissue content. There was significant correlation between Zn levels as evaluated by both extracting solutions.

Palabras llave : Oryza sativa; soil; micronutrients; extracts; solutions.