No abstract

Diferentes cultivares de tomateiro podem apresentar necessidades hídricas diferenciadas, tornando-se indispensável o estudo da demanda hídrica. Desta forma, objetivou-se avaliar a influência de diferentes tensões de água no solo sobre a produção e qualidade pós-colheita de frutos do tomateiro, cultivar Dominador F1, sob cultivo protegido e irrigado por gotejamento. O experimento foi instalado em casa de vegetação com delineamento em blocos casualizados, com quatro repetições. Os tratamentos foram constituídos por seis tensões de água no solo como indicativos do momento de irrigar. As tensões preestabelecidas foram 20, 45, 70, 95, 120 e 145 kPa a 20 cm de profundidade. Aos 140 dias após o transplantio as variáveis avaliadas foram: produção total, comercial e não comercial de frutos; produtividade total, comercial e não comercial de frutos; número de frutos por planta; classificação dos frutos comerciais; massa média dos frutos comerciais; incidência de podridão apical (%); eficiência no uso da água (EUA); acidez titulável (AT); sólidos solúveis totais (SST); pH; relação sólidos solúveis totais e acidez titulável (SST/AT); pectina solúvel; vitamina C; firmeza; coloração e teor de macro e micronutrientes da parte aérea. Os resultados demonstraram que para a obtenção dos maiores valores de produção e produtividade de frutos comerciais, número de frutos por planta, número de frutos grandes e médios e massa média de frutos comerciais, deve-se irrigar quando a tensão de água no solo estiver, em torno, de 20 kPa, à profundidade de 0,20 m. As diferentes tensões de água no solo não influenciaram, significativamente, a acidez titulável, pH, relação sólidos solúveis totais e acidez titulável e pectina solúvel. A eficiência no uso da água, em função das tensões de água no solo, aumentou até a tensão de 116,57 kPa. Das características de qualidade avaliadas, os teores de sólidos solúveis totais, de vitamina C, firmeza e índice L* de coloração, apresentaram efeito significativo com as tensões de água no solo.

The search for genetic material of snap beans with desirable yield traits is of utmost importance for yield increase in Brazil. We evaluated 12 snap bean genotypes by diallel crosses that presented characteristics of interest, so as to select the best genitors to generate productive populations in the snap bean breeding program of the Universidade Estadual do Norte Fluminense in Rio de Janeiro state, Brazil. Diallel crosses were performed applying Method 2 of Griffing. The F 1 generation, composed of 36 hybrid combinations, was evaluated in a greenhouse, in a completely randomized design with two replicates. The traits evaluated were: pod weight, length, width and thickness, number of seeds and seed weight. There were significant differences among genotypes for most variables, indicating genetic variability between snap bean lines. The following genitor genotypes proved to be the most suitable when the trait to be improved was yield: Top Seed Blue Line, UENF 1445, UENF 7-20-1, and UENF 7-10-1. The hybrids with higher values of combining ability estimates are indicated to generate promising segregating populations. Thus L3 (Top Seed Blue Line) × L18 (UENF 9-24-2), and L12 (UENF 7-14-1) × L1 (UENF 1445) hybrid combinations showed the best estimates of specific combining ability for the traits under evaluation, suggesting a high probability of obtaining superior ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 18 (2): gmr18214 A.B.S. Gomes et al. 2 genotypes. The efficiency of selection for these traits is based on additive genic action and demonstrates progress in the of snap bean breeding program.

The work consisted of the morpho agronomic evaluation of coffee crop under the influence of intercropping with different types of green manures. The experiment was carried out in the Southern Region of the State of Espírito Santo, Brazil. The experimental plot consisted of five plants per experimental unit, using the clone "Incaper 8142" Conilon Vitória, intercropping with different types of green manure plants, which were: guandu beans (Cajanus cajan), pig bean (Canavalia ensiformis), mucuna preta (Mucuna Pruriens) and Mexican margaridão (Tithonia diversifolia) in addition to a control treatment without green manure. The planting consisted of rows adjacent and located in the “upper interline” meaning is not clear of the coffee crop. The morpho agronomic characteristics evaluated were: plant height, orthotropic branch diameter, plagiotropic branch diameter, number of leaves, number of nodes, number of orthotropic branches, number of plagiotropic branches and productive nodes e productivity green coffee kg/ha, besides the main dependent: The characteristics of greatest direct contribution were number of nodes and number of productive nodes. The species of green fertilizer Mexican Margaridão (Tithonia diversifolia) provided a negative effect on the main variables related to production, and is not recommended for interplanting with robusta coffee.

The objective of this work was to evaluate the vegetative development of radish seedlings in different organic substrates with seeds from two types of commercial packing. The completely randomized design was used in a 4 x 2 factorial scheme, consisting of four substrates (commercial, tanned bovine manure, mixed organic compound and vermicompost) and two seed packings (aluminized envelope and can), with eight replications, totalizing 64 seedlings. The biometric evaluations of the seedlings were carried out on the 14th day after sowing, and the following phytotechnical parameters were evaluated: leaf number, total fresh mass; fresh mass from aerial part and fresh mass from the root. According to the results, the commercial, vermicompost and mixed organic substrates provided the best results for the variables evaluated when the can was used.