Adaptability and stability of commercial yield of arracacha in southern region of Minas Gerais State

Abstract

ABSTRACT The arracacha is a great economical alternative for Brazilian farmers. The aim of this research was to determine the stability and adaptability of arracacha clones by the methodology of factors analysis and bissegmented regression. Five clones, three cultivars (Amarela de Senador Amaral, BRS Rubia 41 and BRS Catarina 64), and two advanced clones (EH-48 and EH-56) were evaluated in 10 locations in the southern of the Minas Gerais State, Brazil, in the agricultural years 2012/13, 2013/14 and 2015/16. The experimental plots consisted of three random samples within the arracacha observation units. Each sample consisted of five plants collected in sequence, highlighting and weighing commercial roots and transforming the portion of the production data for t ha-1. Individual and joint variance analyzes were performed and, with the adjusted means the Scott-Knott grouping test was done. The bissegmented regression factors were analysed to obtain the stability and adaptability. The EH-56 clone stood out for its productive potential in almost all environments, superior to the other clones. The EH-56 clone stood out as the most suitable through the analysis of factors methodology, while BRS Rubia 41 and BRS Catarina 64 had specific adaptation to some environments and Amarela de Senador Amaral, variety that has been multiplied locally by farmers for over 15 years is little adapted. By bissegmented regression, no clone had ideal behavior. However, BRS Rubia 41 stands out for good adaptation in favorable environments. The analysis of factors associated to the bissegmented regression allows better accuracy in the response of arracacha clones to stability and adaptability.