Lauter Silva Souto

Determination of the number of harvests to select elite sugarcane genotypes in NE Brazil

Sixty-eight sugarcane genotypes were evaluated to determine the number of harvests required to select new genotypes in the sugarcane belt in the state of Pernambuco, northeast Brazil. Using a random block design, the following parameters were evaluated: (i) polarizable sugars (POL) per hectare, in metric tons (TPH); (ii) culm productivity per hectare (TCH); (iii) fiber content (FIB); (iv) adjusted percent POL (PCC); (v) soluble solids (BRIX); (vi) total recoverable sugars (ATR); and (viii) metric tons of ATR per hectare (ATR t.ha-1). A variance analysis and genetic parameter estimation were carried out. Means were analyzed using the Scott and Knott test. The repeatability coefficient and the number of harvests were determined using analysis of variance, principal component analysis, and structured data analyses. The best cultivars were SP79-1011, RB952692, RB952675, RB813804, SP78-4764, RB952522, RB952511, RB953265, RB952754, RB952875, SP80-1816, RB763710, and RB892575. Two evaluations are enough to select elite genotypes in the early experimental stages, reducing the time-to-market of these cultivars by three years under the edaphic and climatic conditions in the sugarcane belt evaluated

Seleção de cultivares de cana-de-açúcar para a Zona da Mata Norte de Pernambuco III: Final de safra

Sendo os cultivares melhorados a base de sustentacao e desenvolvimento do setor sucroeneregetico no Brasil, objetivou-se com este trabalho avaliar o desempenho agroindustrial de 26 cultivares de cana-de-acucar na microrregiao canavieira da Mata Norte de Pernambuco. O experimento foi conduzido na area agricola da Usina Olho D’agua, onde foi utilizado o delineamento experimental em blocos casualizados com quatro repeticoes. As variaveis analisadas foram: toneladas de pol por hectare, toneladas de cana por hectare, fibra, pol % corrigida, pureza, teor de solidos soluveis e acucar total recuperavel. Realizou-se a analise de variância conjunta dos experimentos e estimativa de parâmetros geneticos, as medias foram agrupadas pelo teste de Scott e Knott ao nivel de 5% de probabilidade. Realizou-se ainda a rentabilidade economica bruta de cada cultivar.xa0 Constatou-se que a selecao de cultivares superiores deve ser baseada nas variaveis TPH e TCH. Como opcoes de cultivo comercial para a primeira epoca de colheita destacam-se como mais produtivos, RB92579, RB867515, e RB942991. Selection of sugarcane cultivars to the North Forest Zone of Pernambuco I: Home crop Abstract: Improved cultivars are support base and development of energetic and alcohol sector in Brazil, aimed with this work was to evaluate the agroindustrial performance of 26 sugarcane cultivars in the microrregion da Mata Norte of Pernambuco. The experiment was conducted in the agricultural area of the sugarmill Olho dgua, which was used a randomized block with four replications. The variables analyzed were tons of pol per hectare, sugarcane tons per hectare, fiber, corrected pol%, purity, soluble solids content and total recoverable sugar. Were conducted the variance analysis and estimation of genetic parameters, the averages were grouped by the Scott and Knott test at 5% probability. It was held still gross economic profitability of each cultivar. The selection of superior cultivars should be based on TPH and TCH variables. As commercial cultivation options for the first harvest season stand out as more productive, RB92579, RB867515 and RB942991.