Potencial fisiológico de sementes de Sesamum indicum L. após o tratamento com o zinco

Abstract

The sesame (Sesamum indicum L.) is an oleaginous plant belonging to the Pedaliaceae family. The species is native to India, being considered one of the oldest oilseeds used by mankind. The application of micronutrients such as zinc causes increases in sesame crop in terms of number of capsules per plant, capsule weight, number of seeds per capsule, weight of a thousand seeds, seed production and oil production. Zinc is an essential element, as it acts on the synthesis of plant hormones involved in the growth of plants. The objective of the present study was to evaluate the physiological potential of black sesame seeds after zinc treatment. The doses of zinc applied were 25, 50, 75 and 100 g. ha-1 and dose 0 which corresponds to the seeds not treated with zinc. The seeds of lot 2 presented a higher percentage of moisture than lot 1, there was variation of only 0.1%, respectively 4.7% and 4.8% for each lot, an average germination value of 90.5% for lot 01 and 93% for lot 02 at the dose of 25 g.ha-1. In the first counting variable, the mean value was 58.50% at doses of 25 and 50 g.ha-1. The values for the dry matter mass per seedling were 0.0021 in lot 01 and 0.0022 g / seedling in lot 02. There was significant difference between the different doses of zinc for the variables first count, germination speed index and emergency speed index, but only the emergency response rate responded satisfactorily to treatment with zinc at the dose of 25 g.ha-1. By means of the observed values it is possible to recommend the application of the product Maxizinc in the dose of 25 g. ha-1.