Resumo: Estudos realizados com feijão-caupi, Vigna unguiculata (L.) Walp., têm mostrado que é possível obter genótipos estáveis com adaptação ampla e bons níveis de produtividade, principalmente com o uso de irrigação. Neste trabalho, objetivou-se avaliar o desempenho de genótipos de feijão-caupi em cultivo irrigado e de sequeiro. O delineamento experimental foi em blocos casualizados, com 20 tratamentos e quatro repetições, sendo cada unidade experimental constituída por uma parcela de quatro linhas de 5 m espaçadas de 0,80 m. Avaliou-se comprimento, largura e número de grãos por vagem, massa de cem grãos e produtividade de grãos secos. Nos sistemas de cultivo irrigado e de sequeiro, as cultivares e linhagens apresentaram respostas diferenciadas com relação à produtividade de grãos secos. As linhagens MNC02-701F-2 e MNC02-676F-1 foram as mais produtivas no sistema de cultivo irrigado, e as linhagens MNC03-736F-2 e MNC02-675F-9-5 no sistema de sequeiro. As linhagens MNC02-675F-9-5 e MNC03-736F-2 e as cultivares BRS Xiquexique e BRS Gurguéia apresentaram produtividades semelhantes quando cultivadas em regime irrigado e de sequeiro. A interação no desempenho de genótipo de feijão-caupi em sistemas distintos (irrigado e sequeiro) sugere forte influência de fatores ambientais sobre os componentes de produção avaliados, tornando-os dependentes de variações ambientais e de manejo. Palavras-chave: Produtividade de grãos. Interação. Vigna unguiculata (L.) Walp.Abstract: Studies with the cowpea, Vigna unguiculata (L.) Walp., have shown that it is possible to obtain stable genotypes of wide adaptation and with good levels of productivity, mainly through the use of irrigation. The aim of this study was to evaluate the performance of cowpea genotypes under irrigated and rainfed cultivation. The experimental design was of randomised blocks with 20 treatments and four replications, each experimental unit comprising a plot of four 5 m rows spaced 0.80 m apart. The length, width and number of grains per pod, 100-grain weight and dry grain yield were evaluated. In the irrigated and rainfed systems, the cultivars and strains showed different responses in relation to dry grain yield. The MNC02-701F-2 and MNC02-676F-1 strains were the most productive under the irrigated system, and the MNC03-736F-2 and MNC02-675F-9-5 strains under the rainfed system. The strains MNC02-675F-9-5 and MNC03-736F-2 and the cultivars BRS Xiquexique and BRS Gurguéia had similar yields when grown under the irrigated and rainfed regimes. The interaction on genotype performance in the cowpea under different systems (irrigated and rainfed) suggests the strong influence of environmental factors on the production components under evaluation, making them dependent on environmental variation and management.

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The objective of this work is to evaluate the adaptability and phenotypic stability of the RB sugarcane genotype using the AMMI method. The experiments were performed in five production units in the state of Pernambuco, in cultivars of sugarcane soca and ressoca, using 14 RB sugarcane genotypes-11 RB clones of series 2004 and three cultivars as controls. Each combination of production unit × cutting was considered as environment, for a total of 13 environments. The experimental design was with random blocks, and four repetitions. We estimated the parameters tons of sugarcane per hectare (TCH) and tons of pol per hectare (TPH). The genotype G12 displayed general adaptability, phenotypic stability and high productivity for the two parameters. The genotypes G10, G13 and G14 had the highest yield, largest contribution of G×E, indicating specific adaptability. The environments A12 and A13, in Primavera, are recommended for preliminary selection trials.

Aims: To compare and evaluate the germination index of caryopsis obtained by means of different crossing methods and to determine the quantitative of seeds to be used to compose the base population for selection among families by the Simplified Selection System (SSS) method. Study Design: The experiment was conducted under a completely randomized design. Place and Duration of Study: Devaneio Station of Sugarcane Flowering and Crossing and Experimental Sugarcane Station of Carpina, between February 2018 and December 2018. Methodology: 27 crosses were performed, being eight biparental, ten polycrossing and nine self-fertilized. Germination tests were carried out in the greenhouse. From each crossing, four samples were sown with 0.5g caryopsis. The number of germinated caryopsis per box, five and thirty days after sowing, was evaluated to estimate the percentage of germination (% G). Results: In the first evaluation, the C27 crossing (53.73%) presented the highest average. The caryopsis obtained by self-fertilization (12.82%) presented the highest germination average, followed by the polycrossing (10.88%) and the biparental crosses (9.99%). In the second evaluation, it was found that the crosses C8 (76.74%), C27 (61.02%), C3 (53.99%) and C13 (49.65%) presented with averages high. The highest percentage of germination was verified by the biparental method (31.10%), followed by the self-fertilizations (21.35%) and the polycrossing (20.43%). Conclusion: Only crosses that show high germination are recommended for the composition of the families that will be evaluated through the Simplified System of Selection; caryopsis obtained through self-fertilization germinate rapidly compared to the methods of the polycrossing and biparental with respect to crosses between selected energy-sugarcane parents; biparental crosses between selected energy-sugarcane parents tend to have higher fertility of caryopsis than those obtained by means of polycrossing or self-fertilization; the families C1, C3, C8, C13, C26 and C27 can be used to compose the base populations in the SSS.