ABSTRACT The cultivation of the 'Gália' netted melon in hydroponic systems under protected conditions has increased recently. However, the information on nutrient solutions for melon soilless cultivation is still very generalized, which requires studies adapted to the local conditions and the large existing variety of cultivars. With the objective of evaluating the effects of different concentrations of macronutrients in the nutrient solution on the production and quality of 'Gália' melon (Cucumis melo L., hybrid 'Babilonia RZ F1') grown in substrate of coconut fiber, an experiment was conducted in randomized blocks, with five treatments and five replicates. The treatments, concentrations of macronutrients in the nutrient solution, were based on the standard solution recommended by the literature (100%) and the others were obtained from dilutions of this standard solution in tap water (75, 50, 25 and 12.5%). The analyses of the results showed that the variables mean fruit weight, longitudinal diameter and transverse diameter were qua-dratically influenced by the concentrations of the nutrient solution. The concentration of 47% led to the highest mean fruit weight. The increase in the concentration of the solution reduced the content of soluble solids of the fruit by 11.8%.

RESUMEN Últimamente, viene creciendo el cultivo de melón reticulado tipo Galia en sistema hidropónico bajo condiciones de cultivo protegido. Sin embargo, las informaciones sobre soluciones nutritivas para el cultivo sin suelo en melón, todavía son muy generalizadas, habiendo necesidad de estudios adaptados a las condiciones locales y a la gran variedad de cultivares existentes. Con el objetivo de evaluar los efectos de diferentes concentraciones de macronutrientes en la solución nutritiva en la producción y calidad del melón Galia (Cucumis melo L., híbrido Babilonia RZ F1) cultivado en sustrato de fibra de coco, se género un experimento conducido en delineamiento de bloques al azar, siendo este de cinco tratamientos y cinco repeticiones. Los tratamentos, concentraciones de macronutrientes en la solución nutritiva, se basaron en la solución estándar recomendada por la literatura (100%) y, los demás, obtenidos a partir de diluciones de esta solución estándar en agua del grifo (75, 50, 25 y 12,5%). Los análisis de los resultados mostraron que las variables peso medio de frutos, diámetro longitudinal y diámetro transversal fueron cuadraticamente influen ciadas por las concentraciones de la solución nutritiva. La concentración del 47% condujo al mayor peso medio de los frutos. El aumento de la concentración de la solución redujo en un 11,8% el contenido de sólidos solubles del fruto.

Este trabalho objetivou avaliar a qualidade sanitária de sementes de arroz, quantificar a transmissão de Curvularia lunata associada à semente e à plântula, e avaliar o efeito dos isolados de Bacillus spp., no controle da mancha foliar, do cultivar Bonança. Para avaliação da sanidade de sementes, as amostras foram desinfestadas e plaqueadas, sendo avaliadas após sete dias de incubação. Na confirmação da patogenicidade, as plântulas foram inoculadas por meio de pulverização e a avaliação da doença ocorreu sete dias após. Na caracterização do isolado de C. lunata, foi realizada medição da largura, comprimento e número de septos de 100 conídios. Para a taxa de transmissão de C. lunata, foram preparadas 12 bandejas, com 100 sementes cada, de modo a proceder-se às avaliações aos 7, 14, 21 dias após a semeadura (d.a.s.). De cada uma das 100 plântulas, foram separadas as raízes, após sete dias. A inoculação dos isolados de Bacillus foi realizada na forma de suspensão, pulverizada sobre a parte aérea das plântulas. Após uma semana, foi inoculado a C. lunata. A avaliação foi efetuada aos 15 dias após inoculação dos isolados patogênicos, medindo-se o tamanho da lesão. No teste de sanidade foi detectada maior incidência de C. lunata (70%), o qual se apresentou patogênico à variedade de arroz Bonança, sendo detectado em todos os órgãos da plântula. Dentre os isolados de Bacillus, os que mais se destacaram no controle foram B41 (B. Cereus) e B35 (Bacillus sp.), confirmando seu potencial biocontrolador.

This study evaluates the sanitary quality of rice seeds cultivar Bonança, quantifies the transmission of Curvularia lunata associated with seeds - seedling and evaluates the efficiency of Bacillus spp. isolates for the control of leaf spot. The samples were disinfected and plated, and seed health was evaluated after seven days. After confirmation of pathogenicity, the seedlings inoculated by the spraying method and the occurrence of disease was assessed after seven days. For characterization of the C. lunata isolate, width and length measurements and number of septa of 100 conidia were taken. We assessed transmission rate of C. lunata in 12 trays, each with 100 seeds, and conducted evaluations at 7, 14, 21 days after infection. From each of the 100 seedlings we separated the primary root, the stem and glumes and plated them on PDA for evaluation after seven days. The inoculation of Bacillus isolates was carried out throughaerial spraying of the suspension on the plants. After one week, C. lunata was inoculated and after 15 days lesion dimensions were measured. We detected the highest incidence of C. lunata (70%), which was pathogenic to the rice variety Bonança and was detected in all organs of the seedling. Among the isolates of Bacillus, those that stood out in controlling C. lunata were B41 (B. Cereus) and B35 (Bacillus sp.), confirming their potential for biocontrol.