PERFORMANCE DE CULTIVARES DE CANA-DE-AÇÚCAR, TRANSGÊNICA E CONVENCIONAL, EM AMBIENTE IRRIGADO SOB PIVÔ CENTRAL

Abstract

The sugarcane industry persistence in using old sugarcane cultivars, the relevant pest prevailing in the cultivation areas, such as the borer (Diatraea saccharalis), and the mismanagement of leaf stimulants (amino acids and nutrients), even in irrigated environments of greater yield potentials, have had a negative impact on agroindustrial yield. This paper aimed to analiyze, evaluate, and compare the performance of transgenic and conventional sugarcane cultivars in the irrigated environment in the northwest of Minas Gerais (MG), Brazil. The experiment was undertaken in the Paracatu Valley, in João Pinheiro municipality, MG. The sugarcane pre-sprouted seedlings (PSS) were planted in July 2021. Irrigation was done with a central pivot during the sugarcane-plant cycle, using blade management by the "Irriger connect" platform. The experimental design was in randomized blocks (DRB). Two experiments were carried out in the same test, being test A, with six sugarcane genetics, and test B, in 3 x 2 factorial scheme with three varieties of transgenic cane with and without foliar stimulus based on amino acids and nutrients. The final infestation index (FII) of sugarcane borer, ton of sugarcane per hectare (TSH), total recoverable sugar (TRS), and ton of sugar per hectare (TSH) were evaluated. The results were submitted to analysis of variance, test F. The mean comparison test was used for the relevant data. The descriptive statistics was also applied. The transgenic cultivars presented 0% of FII, while the conventional ones were 1.6%, 1.8%, and 4.5% in ascending order, respectively, CTC20, CTC9001, and CTC9003. Results showed that there was a reduction in the sugarcane technological quality with the increase in the FII. The Bt transgenic varieties showed great efficiency in controlling theviii sugarcane borer, which reflected in a positive change in the TSH variable for all these varieties. The foliar stimulus did not cause any influence on the agroindustrial yield of the genetically modified organisms.