Sugar apple (Annona squamosa L.) is one of the most widely grown member of the Annonaceae family in several regions, but there is still a lack of agronomic data regarding the management of its initial growth stages under Cerrado conditions. The aim of the present study was to evaluate the production of Annona squamosa L. seedlings under different environmental conditions achieved by using shade nets (E1: ChromatiNet® Silver 50%; E2: ChromatiNet® red 50%; E3: ChromatiNet® red 35%; E4: ChromatiNet® Silver 35%) in combination with four different substrates (S1: soil + sand + chicken manure; S2: soil + sand + cattle manure; S3: soil + sand + cattle manure + chicken manure; S4: soil + sand + sheep manure). An experiment was set up using a completely randomized design with treatments in a split-plot arrangement, with four replicates and ten plants per experimental unit. Seedling growth par...

Objetivou-se com esse trabalho avaliar as características agronômicas de doze cultivares de melancia produzidas nas condições edafoclimáticas do cerrado de Roraima. O experimento foi desenvolvido no Campo Experimental Água Boa da Embrapa Roraima. O delineamento experimental foi em blocos ao acaso com quatro repetições e seis plantas por parcela. Os tratamentos consistiram das cultivares: Combat, Conquista, Verena, Congo, Magnum, Electra, Santa Amélia, Explore, Emperor, Crimson Select Plus, Charleston Gray Super e Omaru Yamato. Avaliaram-se as características produtivas, de sementes e de qualidade dos frutos. Concluiu-se que as condições edafoclimáticas do cerrado de Roraima favorecem as características produtivas e qualitativas dos frutos das cultivares de melancia analisadas. A maior produtividade foi encontrada no cultivar Crimson Select Plus, com média de 67848,25 kg ha...

Objetivou-se com esse trabalho avaliar as características agronômicas de doze cultivares de melancia produzidas nas condições edafoclimáticas do cerrado de Roraima. O experimento foi desenvolvido no Campo Experimental Água Boa da Embrapa Roraima. O delineamento experimental foi em blocos ao acaso com quatro repetições e seis plantas por parcela. Os tratamentos consistiram das cultivares: Combat, Conquista, Verena, Congo, Magnum, Electra, Santa Amélia, Explore, Emperor, Crimson Select Plus, Charleston Gray Super e Omaru Yamato. Avaliaram-se as características produtivas, de sementes e de qualidade dos frutos. Concluiu-se que as condições edafoclimáticas do cerrado de Roraima favorecem as características produtivas e qualitativas dos frutos das cultivares de melancia analisadas. A maior produtividade foi encontrada no cultivar Crimson Select Plus, com média de 67848,25 kg ha...

Refrigeration is necessary to preserve the quality of watermelon fruits for longer, however, this technology is difficult to access and costly. Therefore, it is necessary to look for alternatives such as the selection of new varieties of watermelon that present good resistance to transport, superior fruit quality and high postharvest shelf life. In this context, the objective in this work was to evaluate the morphological, physicochemical and shelf life characteristics of the fruits of nine varieties of watermelon. It was conducted through a randomized complete block experimental design in a subdivided plot scheme. Nine varieties of watermelon were evaluated in the plots: Explorer, Magnum, Santa Amelia, Top Gun, Crimson Sweet, Electra, PX 397, Charleston Gray and Jubilee, and in the subplots five storage times: 0; 5; 10; 15 and 20 days. The edaphoclimatic conditions of the Amazon Savanna...

Refrigeration is necessary to preserve the quality of watermelon fruits for longer, however, this technology is difficult to access and costly. Therefore, it is necessary to look for alternatives such as the selection of new varieties of watermelon that present good resistance to transport, superior fruit quality and high postharvest shelf life. In this context, the objective in this work was to evaluate the morphological, physicochemical and shelf life characteristics of the fruits of nine varieties of watermelon. It was conducted through a randomized complete block experimental design in a subdivided plot scheme. Nine varieties of watermelon were evaluated in the plots: Explorer, Magnum, Santa Amelia, Top Gun, Crimson Sweet, Electra, PX 397, Charleston Gray and Jubilee, and in the subplots five storage times: 0; 5; 10; 15 and 20 days. The edaphoclimatic conditions of the Amazon Savanna...

Camu-camu (Myrciaria dubia (Kunth) McVaugh) is a native fruit tree, which is in domestication process, therefore, knowledge of nutritional needs is essential to improve the fertilization efficiency throughout plant development. The aim of this research was to determine the nutrient content of camu-camu plants as a function of nitrogen fertilization via fertirrigation in the first year of cultivation. An experiment was carried out in a randomized complete block design, with 5 treatments as follows: 0; 40; 80; 120 and 160 kg.ha-1 of N, eight replicates and seven plants per experimental unit. The evaluated variables were as follows: total dry matter and nutrient contents in camu-camu leaves. The results show total dry matter of camu-camu plants, which were performed a significant quadratic behavior in response to increasing N doses. In Fact, N doses greater than 128 kg.ha-1 aroused a depres...

El objetivo en este trabajo fue determinar el mejor invernadero, sustrato y aditivo para el enraizamiento de miniestacas de G. crinita M. para ello fue utilizado material apical de 5 cm de longitud, 4 mm de diámetro y 2/3 de área foliar (20-30 cm2), provenientes de plantas de G. crinita M. Después de 20 días,fue determinado entre 93,3 y 100% de enraizamiento, 100% de sobrevivencia y 100% de brotes en las miniestacas instaladas en los invernaderos policarbonato y malla raschel® asociados con los sustratos y aditivos arena fina-sanix® y jiffy®-rapid root®. También fue determinado 18,9 raíces en la combinación de policarbonato-arena fina-rapid root®. En malla raschel® y policarbonato con jiffy®-rapid root® y rapid root®-sanix® fue determinado 14,5 y 12,6 raíces, respectivamente.En condiciones de policarbonato-arena fina fue constatado 46,1 cm y en jiffy® con malla raschel...

La utilización de extractos vegetales como insecticidas naturales es una alternativa eficiente y ecológicamente viable para el uso directo en el control de plagas. En el estudio se evaluó el efecto de diferentes concentraciones de resina de Jatropha curcas en el control de larvas de Hypsipyla grandella Zéller, para el efecto en un Diseño Completamente al Azar (DCA), en esquema de parcelas subdivididas, se evaluaron cinco tratamientos, en tres repeticiones y 10 discos foliares de S. macrophylla por unidad experimental. Las parcelas principales consistieron en cinco concentraciones (%) de resina de J. curcas: T1:0; T2: 10; T3: 20; T4: 30; y T5: 40 y las subparcelas en los tiempos de evaluación (horas): 6, 12, 18 y 24 en el transcurso del día. Como variables medidas se incluyeron el consumo del disco foliares-CDF (%), el incremento de consumo foliar-ICF (%), la sobrevivencia-SL (%), ...

Myrciaria dubia (Kunth) McVaugh es un árbol frutal nativo de la Amazonía con gran potencial debido a sus propiedades nutracéuticas, por lo que se considera necesario desarrollar tecnologías de adaptación ex situ. El objetivo de este estudio fue estimar la evapotranspiración (ETc) y el coeficiente de cultivo (Kc) de Myrciaria dubia para su domesticación y conservación en suelos de tierra firme. Se trasplantaron, a lisímetros de drenaje, dos plantas de Myrciaria dubia de 2, 4 y 6 años de edad con características morfológicas similares en altura, número de ramas (basales y terminales) y diámetro (de tallo y dosel). Se aplicó, a una planta de cada categoría de edad y en una ocasión, acolchado orgánico compuesto de una hierba nativa (Trachypogon plumosus). Los valores promedio de la ETc de las plantas de 2, 4 y 6 años de edad en presencia y ausencia de acolchado fueron 2 y ...