Correlation Between Grain Yield, Aluminum and Silicon Content In Upland Rice Plants Cultivated In Upland Soil Aluminate As Function As Si Application.

The beneficial effect of silicon in plants is most evident in crops under stress conditions, because the Si is able to protect plants against various biotic and abiotic stresses, among them the Al³⁺ stress. The accumulation of Al³⁺ and Si in the shoot is exclusive, this is, and when Si is absorbed Al³⁺ is no longer. Given the above, the aim of this work was to evaluate the correlation between grain yield, aluminum and silicon content in the shoots of upland rice grown in soil with high concentrations of Al³⁺ and application of Si. The experiment was carried out in post of 40 L with soil naturally aluminate, presenting the initial amount of Al³⁺ to 11 mmol_c dm^-3. The experimental design was randomized blocks, in factorial design 2x5 with four replications. The treatments were two cultivars of upland rice: BRS Talento - not tolerant to toxic Al³⁺, modern, Guarani - tolerant to toxic Al³⁺, traditional, and added to soil five Si rates (0, 30, 60, 90, 120 mg dm^-3). The results showed that Guarani cultivar exhibited no correlation between productivity and Si contents and Al³⁺ in the shoot of plants, however, there was a negative correlation between Si contents and Al³⁺. As for  BRS Talent, there was a correlation between yield and content of Si, already Al³⁺ content correlates with negatively yield in and there was a negative correlation between Si content and Al³⁺. These results indicate that there is interaction between Si and Al³⁺ for BRS Talent, making the Si applied to increase the Si content is decreased and the Al³⁺ content in shoot of plant, consequently increasing grain yield. Guarani cultivar there is interaction between Si and Al³⁺ contents, however, does not influence the yield.