Produtividade de ressoca de genotipos de cana-de-açucar oriundos de micropropagação no brejo paraibano

Abstract

Sugarcane cultivation is very prominent in the Brazilian Northeast, the adoption and adaptation of new planting systems has gained new directions over the years, the seedlings coming from the pre-sprouted system (MPB) are an excellent alternative to maintain the health and high standard production of sugarcane fields. Therefore, the objective of this research is to evaluate the adaptation and productivity of sugarcane in a rainfed system in a drying cycle, in a crop using pre-sprouted seedlings of nine varieties. The experiment was implemented in June 2019, in randomized blocks (DBC), with four replications and nine treatments, totaling 36 plots, with an average area of each plot of 25m² (5mx5m), resulting in a total area of 1,219 m² (23mx53m). The treatments used were nine sugarcane genotypes, derived from vegetative micropropagation: CTC-15, CTC-9004, CTC-9005, RB 015935, RB 965902, RB 975201, RB 975242, RB 935744, RB 867515. Among the genotypes used, RB 867515 was referenced in full control, as it is a variety that is very prominent throughout the northeast region, especially in the Paraíbano marsh. Plant height (AP), average stem diameter (DC), number of tillers (NP m/L), number of internodes (NE), maturation index (MI), soluble solids content (° Brix), and Productivity (TCH). After collection, the data were subjected to analysis of variance, and the means were compared using the Scott-Knott test at 10% probability, using the statistical program R® version 4.2.1. In general, the results obtained for each variable, Plant Height (AP) had no significant difference, as for the parameters of Average Stem Diameter (DC) the CTC-9004 genotype had higher values, in Number of tillers (NP m /L) the genotypes CTC-9005 and RB 935744 had the highest values, while in (NE) the genotypes CTC-9005 and RB 975242 had very significant results compared to the other varieties, in Maturation Index (MI) and highlighted we had CTC -15, CTC-9004, CTC-9005, RB 965902, and RB 975201, the highlighted genotypes were in the soluble solids content (°Brix), with higher averages among the genotypes CTC-9005, CTC-9004, and RB 965902, the highest TCH values were obtained by CTC-9004, RB-935744, and RB 975242, the genotypes related to the control (RB 867515), showing a good productive response in its third cycle, when cultivated under rainfed conditions in the Paraíba swamp.