Thiamine as a promoter on initial development in varieties of sugarcane

Abstract

This work aims to know thiamine response as a growth promoter in sugarcane varieties. A completely randomized experimental was installed and designed in a double factorial scheme at 3x4 levels, in which the first factor consists of a variety of sugarcane: RB86-7515; RB96-6928 and CTC-4; the second factor was thiamine doses in five levels: zero mg L^-1; 100 mg L^-1; 200 mg L^-1; 400 mg L^-1 and 800 mgL^-1; fifteen treatments were made with five replications, 75 plots in total. Forty five days after planting the following variables were determined: ESI – emergence speed index; ALA – average leaf area; APL – aerial part length; DMAP – dry mass of aerial part ; DMR – dry mass of root; XD – leaf xylem vessel diameter and PD – leaf phloem vessel diameter. It is recommended doses of 400 mg L-1 Thiamine use as a promoter of growth in varieties RB86-7515; RB96-9628 and CTC-4 of sugarcane. Emergence speed index and diameter of xylem vases of leafs in CTC-4 varieties showed a negative response to Thiamine use. However, since the work was conducted only once, more studies are needed to prove the results.