Abstract: Sugarcane cultivar RB961552 was developed by the Sugarcane Breeding Program of the Federal University of Alagoas, a member university of RIDESA. It was selected for being highly productive, responsive to fertigation and for the high leaf biomass and excellent inter-row closure. It is resistant to brown and orange rust and moderately resistant to leaf scald and smut diseases.

Abstract Sugarcane cultivar RB0442 has a high yield, late maturation and good drought tolerance. It is recommended for planting in restrictive environments, mainly with water-deficient soils, and is resistant to the major sugarcane diseases of the Northeastern region of Brazil.

RB99395 cultivar was developed by the Sugarcane Breeding Program at the Federal University of Alagoas, which is part of RIDESA. In 1999, seeds were obtained from crosses between RB867515 cultivar and pollen from an unknown genotype in "Serra do Ouro" Crossing Station. The process of selection and experimentation was carried out in three Research Stations of Alagoas. RB99395 cultivar was released in Alagoas in May 2010, and has a high content of sucrose throughout the harvest period. Planting is recommended in fertile soils and in environments with no water deficiency, a condition which results in high agricultural yields. It is tolerant most diseases that occur in Northeast, Brazil.

Os objetivos deste trabalho foram estabelecer estimativas de repetibilidade de características agroindustriais em 20 genótipos de cana-de-açúcar, determinar a previsibilidade de cada caráter e indicar a predição do valor verdadeiro de cada clone. O delineamento utilizado foi blocos casualizados, com cinco repetições. Utilizaram-se a análise de variância com dois fatores de variação (cortes e genótipos) e a análise dos componentes principais para estimar o coeficiente de repetibilidade <img border=0 width=19 height=21 id="_x0000_i1026" src="../../../../img/revistas/pab/v39n4/20437s1.gif" align=absmiddle>, a partir de três cortes. Foram obtidas estimativas de repetibilidade acima de 0,5 para fibra e toneladas de cana por hectare, em ambos os métodos, com confiabilidade maior que 84% pelo método dos componentes principais. As características que ficaram abaixo de 0,5, com previsibilidade inferior a 74%, necessitam de um maior número de avaliações. Os métodos dos componentes principais e análise de variância indicaram, em cinco cortes, uma previsibilidade maior que 80% para fibra, porcentagem de pol (sacarose) no caldo da cana, toneladas de cana por hectare e toneladas de pol no caldo da cana por hectare, embora o primeiro tenha sido mais eficiente. Considerando toneladas de cana por hectare e toneladas de pol no caldo da cana por hectare, os clones RB9371, RB9350 e RB9364 são os melhores.

The objectives of this work were to establish repeatability estimates for agro-industrial characteristics for twenty genotypes of sugar cane, to indicate the determination coefficient of each character and the prediction of truthful value of each clone. The design consisted of randomized blocks, with five replications. The analysis of variance with two factors of variation (cuts and genotypes) and the analysis of the main components were used to estimate the repeatability coefficient <img border=0 width=19 height=21 id="_x0000_i1028" src="../../../../img/revistas/pab/v39n4/20437s1.gif" align=absmiddle>, initiating with three cuts. Estimates of repeatability were obtained over 0.5 for fiber and ton of cane per hectare, in both methods, with confidence over 84% by the method of main components. Characteristics lower than 0.5 and determination lower than 74% need a greater number of measures. The methods of main components and analysis of variance evidenced, in five cuts, determination over 80% for fiber, percentage of pol (sucrose) in the juice of cane, tons of cane per hectare and tons of pol in the juice of cane per hectare, though the first had been most efficient. Considering tons of cane per hectare and tons of pol in the juice of cane per hectare, the clones RB9371, RB9350 and RB9364 are the best.