Calagem em ressoca de dez genótipos de Saccharum Officinarum L.

Abstract

Sugarcane is one of the main sources of energy in the world. Currently, Brazil is the largest producer of the crop and the second largest producer of ethanol in the world. Studies involving the production of sugarcane in the Brejo Paraibano are still poorly elucidated, and the evaluation of parameters related to the development of the culture is essential. Within this context, the present work aimed to evaluate the behavior of different varieties of sugarcane under the effect of residual lime in the soil and its adaptation in the Brejo Paraibano. The experiment was carried out at the Experimental Farm Chã de Jardim CCA/UFPB. The experiment was set up in a randomized block design, in a 10x2 factorial scheme, with the first factor corresponding to the varieties and the second factor corresponding to the presence or absence of limestone in the soil, with 20 treatments and 4 replications, totaling 80 plots. The variables analyzed were: Plant height, Number of plants per linear meter, Number of leaves per plant, Average stem diameter, Number of internodes. The data were submitted to Analysis of Variance (ANOVA) by the F test and subsequent test of means by the Scott-Knott criteria, at 5% probability with the aid of the statistical program R® version 3.6.1. Significant interaction at 1% probability by the F test was observed for all variables. The residual effect of limestone influenced the sugarcane varieties in all tested variables. Genotype 1 and variety RB962962 showed positive responses to the effect of residual lime in the soil and adaptation to Brejo Paraibano for most of the variables analyzed.