Abstract
ABSTRACT Family farmers in the western Santa Catarina state, Brazil, have conserved local dryland rice varieties. However, the literature lacks data about the milling performance of these varieties, as well as about the effects of genotypes, environment and genotype x environment interaction. The current study aimed to evaluate the milling yield, as well as whole, broken, white-belly and chalky grains, in experiments designed in complete randomized blocks, with four replications, in two sites. The rates for milling yield and whole and broken grains were, respectively, 57.93-69.90 %, 38.73-66.0 % and 3.40-22.15 %, with 15 local varieties reaching values similar to those recorded for modern dryland rice varieties. The Anchieta county (origin of the varieties) recorded the highest values for milling yield and whole grain. The incidence rates for white-belly and chalky grains were, respectively, 0.10-8.68 % and 0.02-3.12 %. Significant differences (p ≤ 0.05) were observed for genotype, environment and genotype x environment interaction effects, concerning the milling yield. For whole and broken grains, the differences were significant (p ≤ 0.05) for genotype and environment, but not significant for genotype x environment interaction. For white-belly and chalky grains, the differences were significant (p ≤ 0.05) for genotype and genotype x environment interaction, but not significant for environment. For all the studied milling yield variables, differences were observed for the varieties' stability, as well as established a stability ranking.
Highlights
Farmers in the western Santa Catarina state, Brazil, traditionally grow local dryland rice varieties for self-consumption purposes and, occasionally, they sell them in the local market
Experiments were conducted in a smallscale farm in the Anchieta county, as well as at the experimental farm of the Universidade Federal de Santa Catarina (UFSC), in Florianópolis, Santa Catarina state, Brazil
Twenty-two local varieties grown in Anchieta recorded milling yield values above the market standard (Cepea 2015) and above those required by processing industries (68 %)
Summary
Farmers in the western Santa Catarina state, Brazil, traditionally grow local dryland rice varieties for self-consumption purposes and, occasionally, they sell them in the local market. the total area planted with dryland rice in the Santa Catarina state has decreased byO. The total area planted with dryland rice in the Santa Catarina state has decreased by. Milling quality is a determining factor featuring the rice variety potential, while milling yield - which is based on the sum of whole and broken grains, after husking and polishing, without counting husk and bran - is one of the main industrial quality aspects of rice varieties. Another fundamental industrial quality aspect lies on the whole and broken grain yield. Husked and polished whole grain dimensions are classified as long thin, long, medium, short and mixed (Brasil 2012)
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