Behavior of cassava varieties (Manihot esculena) in the "Baixada Fluminense" from 1966 to 1970

Abstract

Cassava varieties, considered good for direct human consumption (non-toxic) and varieties considered good for industrialization (toxic) or for direct animal feeding (non-toxic), were tested from crop years, 1966/67 to 1969/70. Results reported are from three regions within the "Baixada Fluminense": Paracambi, RJ, two experiments; Itaguaí, RJ, five experiments; and Santa Cruz, GB, two experiments. There were a total of 33 varieties tested. One trial of the industrial and forage varieties was planted in a split plot design for harvesting after one cycle (11 months) and after two cycles (22 months). The variety Saracura was the most productive in four of the five experiments of varieties for direct human consumption. Saracura and Dourado at the Santa Cruz location were less susceptible to anthracnose (Colletotrichm gloeosporioides f. sp. manihotis). Of the industrial varieties, "Grêlo Roxo" was in the most productive group in all four experiments in which it was included, Variety Mantiqueira (IAC 24-2) was in the first group in three and variety Uvar in two of the four experiments in which it was entered. In an alluvial clay soil of the Iowlands and with a complete cutting of above ground parts of varieties after the first cycle, there was no significant production difference between the two cycles and no significant interaction effect was observed.