Comportamento do algodoeiro cultivar delta opal sob estresse hídrico com e sem aplicação de bioestimulante

Abstract

This work was aimed at evaluating the effect of biostimulant Stimulate® applied or not at different development stages of cotton plant cv Delta Opal, (Gossypium hirsutum L.) cultivated in greenhouse, subjected or not to water stress. Applications of 25, 60 and 100% of total volume of pores (VTP) filled up with water were conducted, and then Stimulate® was sprinkled over the seed and on the flower bud stage, without biostimulant application 69 days after sowing. The water stress time period was that of 15, 30 and 45 days after water stress application. The cotton plant cv Delta Opal did not tolerate hydric deficit of 25% VTP on the flower bud set off, where smaller heights as well as smaller colon diameters and flower number were observed, all of which also endanger reproductive structure formation. The use of biostimulant on the dosage and the type of application did not render any improvement on plant development when submitted to lack of water; nevertheless there was a colon diameter increase on plants subjected to water excess.