Crescimento do algodoeiro sob anoxia temporária em diferentes fases fenológicas.

Abstract

Herbaceous cotton (Gossypium hirsutum L. r. latifolium Hutch) is a plant that suffers modifications in your physiology when cultivated in soil with oxygen shortage. It is a sensitive plant to deficiency of oxygen in the soil, happening several alterations in the metabolism that affect the growth and development. The purpose of this work was to evaluate the growth of cotton, genotype BRS Rubi, grown under greenhouse conditions and exposed to periodic flooding stress of the soil, in different phenological stages. The experiment was carried out in randomized complete blocks with five flooding levels (0 = control or not flooded, 2, 4, 6 and 8 days of waterlogging), three stages (vegetative, flower-bud and flowering) with four replications. The studied variables, after application of the flooding, plant height, stem diameter and leaf area did not suffer significant effect under periodic anoxia, however the crop cycle increased significantly with increment of waterlogging, happening delay of one day to each flooding day. There was not significant effect among phenological stages, and nor interaction of these with waterlogging