New genotypes as alternative to expand the potato cultivation period in the Brazilian Midwest

Abstract

The climatic conditions of the Brazilian Midwest restrict potato cultivation to periods of the year when air moisture is lower and temperatures warmer. Thus, potato planting is restricted to the months of April and May, which provides the plants ideal conditions of development in a period of greater susceptibility to Ralstonia spp. (Rs), which presents better development in conditions of high temperature. This work aimed to evaluate the adaptation of Embrapa’s potato genotypes to the edaphoclimatic conditions of the Federal District Region planted out of the main planting season. Two experiments were carried out in Brasília, DF, at different planting dates in 2017 and 2018. The complete randomized blocks experimental design was used with three replications in 2017 and four replications in 2018. Genotypes F183-08-01, F50-08-01, BRSIPR Bel, Agata, Atlantic and Asterix were evaluated in both years. Clones 24-09, 29-19 and 30-09 were added in 2018. Plant vigor was evaluated by scores ranging from 1 to 5. SAS software was used in all analyzes. Production of marketable tubers of genotype 30-09 was higher than all other genotypes evaluated (25,10 t ha^-1) under conditions favorable to Rs development. Clone 30-09 performed well and may be a potential genotype for increasing the potato-planting window in the Brazilian Midwest, especially when there is a history of Rs occurrence.