Nitrogen and growth promoter: effects on growth and development of green fiber cotton

摘要

> face="verdana" size="2">This research had the objective of quantifying the effects of nitrogen manuring and growth promoter applied in the seeds on growth and development of cotton of green fiber. The experiment was conducted in greenhouse conditions at the National Center of Cotton Research (EMBRAPA-CNPA), where the growth promoter Stimulate® was applied in doses of 10 and 17 mL per 0.5 kg of seeds and the nitrogen topdressing in doses of 0, 80, 160 and 240 kg ha-1. The experimental design was in randomized blocks with nine treatments and three replications in a factorial scheme of 4 x 2 + 1. The variables related to growth (plant height, stem diameter and leaf area) and to development (emergence of first flower button and of first flower and opening of first cotton boll) were analyzed. It was verified that the Stimulate® growth promoter did not alter the growth of the herbaceous cotton as well as did not interact with the nitrogen applied in the edaphic medium. Independent of the growth promoter dose, the nitrogen promoted a significant linear decrease in the precocity of the plants and increased the growth.