Biorregulator on cotton seed germination and initial growth

Abstract

The objective was to evaluate the effect of a bioregulator applied to seeds, on seed germination, emergence and vigor of cotton seedlings. The treatments were a combination of seeds of two cotton cultivars (FMT 701 and FMT 705) exposed to six doses of plant growth regulator: 0.0; 5.0; 10.0; 15.0; 20.0 and 25.0 ml applied 0.5 kg of seed. The experiment was conducted in a completely randomized design in factorial scheme consists of a 2 x 6, with four replications. Germination, initial growth, emergency speed index and seedling emergence were evaluated. Cotton cultivars FMT 701 and FMT 705 differently respond to application of plant growth regulator on seed. The application of plant growth regulator to FMT 701 cultivar cotton seeds did not affect germination, resulted in less vigorous seedlings and reduction in its emergence. For FMT 705 cultivar, the dose of 25 mL produced more vigorous seedlings, reduced seedling emergence, but did not affect seed germination.

Keywords

• Gossypium hirsutum L.
• germination
• seedling vigor
• physiological responses