The postharvest longevity is one of the main aspects that should be considered in the production of cut flowers and is a pre-requisite for product quality and marketing success. However, cut flowers are highly perishable products that need to be treated and stored to maintain its quality and value. This study aimed to assess Heliconia psittacorum 'Golden Torch' inflorescences postharvest longevity, submitted to periodic stem ends cutting and vase water renewal. The experimental design was a completely randomized 3x2 factorial, corresponding to the stem ends cuts (1,0 cm; without cutting; cutting at 24 hours; cutting at 48 hours) and water renewal (with and without renewal), with four repetitions. The assessed variables were: water uptake by flower stems (WUFS); loss of fresh stem mass (LFSM); dry matter of flower stems (DMFS) and postharvest longevity (PHL). The stem cut significantly influenced WUFS and LFSM. However, the water renewal factors affected all variables, while the interaction between factors (stem cuts x water renewal) only influenced PHL. The cuts at the stem base of Heliconia 'Golden Torch' procedures enable the restoration of water potential and this practice, associated with water renewal during storage allows greater tissues hydration, maintaining the postharvest quality. Keywords: Cut flowers, vessels obstruction, postharvest quality. RESUMO Pós-colheita de helicônia 'Golden Torch': benefícios do corte na base da haste e renovação da água de vaso A longevidade pós-colheita é um dos aspectos mais relevantes da produção de flores de corte e é pré-requisito para qualidade do produto e o sucesso na comercialização. No entanto, as flores de corte são produtos altamente perecíveis que necessitam serem tratadas e armazenadas de forma a manter sua qualidade e valor. O objetivo deste estudo foi avaliar a durabilidade pós-colheita de inflorescências de Heliconia psittacorum 'Golden Torch' submetidas a cortes periódicos na base das hastes e renovação da água de vaso. O delineamento foi o inteiramente casualizado, arranjado em esquema fatorial (3 x 2), correspondentes aos cortes (1,0 cm) na base das hastes (sem corte; corte a 24h; corte a 48h) e renovação de água (com e sem renovação), com quatro repetições. As variáveis avaliadas foram: absorção de água pelas hastes florais (WUFS); perda de massa fresca das hastes florais (LFSM); massa seca das hastes florais (DMFS) e longevidade pós-colheita (PHL). Os cortes realizados na base das hastes florais influenciaram significativamente na AAHF e PMFHF. No entanto, o fator renovação de água apresentou efeito sobre todas as variáveis analisadas, enquanto que a interação entre os fatores (cortes na base x renovação de água) influenciaram apenas a POSC. A utilização de cortes na base das hastes florais de helicônia 'Golden Torch' possibilitou o restabelecimento do potencial hídrico e essa prática associada à renovação da água durante o armazenamento permite maior hidratação dos tecidos, mantendo a qualidade de vida pós-colheita. Palavras-chave: floricultur...
Os produtores de mudas de hortaliças estão sempre ávidos por novas tecnologias, especialmente quando se trata do insumo substrato para plantas. Neste sentido, objetivou-se avaliar o desenvolvimento de mudas de melancia cultivar Crimson Sweet, produzidas em diferentes proporções de resíduo de carnaúba para composição de substratos. O experimento foi conduzido em delineamento experimental inteiramente casualizado com cinco tratamentos com diferentes proporções de resíduo de carnaúba com casca de arroz (RCCA) e resíduo de carnaúba em pó (RCP): 1) 100 % RCCA; 2) 75 % RCCA + 25 % RCP; 3) 50 % RCCA + 50 % RCP; 4) 25 % RCCA + 75 % RCP; e 5) 100 % RCP com quatro repetições de 64 plântulas cada. Há influência do uso resíduo de cera de carnaúba como componente de substrato na formação de mudas de melancia cv. Crimson Sweet. O substrato 100% RCCA pode ser usado na produção de mudas de melancia de qualidade.
The genus Heliconia is commercially detached by the exotic appearance of the inflorescences but is susceptible to lack of moisture in the soil, being necessary the irrigation management. In this sense, the objective was to evaluate the effect of different irrigation levels on the plant growth and productive characters of Heliconia psittacorum cv. Golden Torch cultivated in vase. The experiment was conducted from March to October 2014, in a randomized blocks design. Five treatments corresponding to the different irrigation levels were used [50, 75, 100, 125 and 150% of the evaporation measured in Class A (ECA)] with four replicates and two plants per replicate. The following evaluations were carried out: number of days for the emergence of the first tiller, number of days for the emergence of the first inflorescence, number of days for the inflorescence harvest, crop cycle, diameter of the flower stem, length of the flower stem, inflorescence length, plant high, number of tillers and productivity of flower stems. Chlorophyll and leaf area measurements were performed. The irrigation levels tested significantly influenced the number of days for the first inflorescence harvest, length of the flower stem and inflorescence length. The irrigation level of 150% ECA provided better results for the length of the flower stem, inflorescence length and for leaf area but without differences from 75%, 100% and 125% ECA. Thus, for the cultivation of the heliconia cv. Golden Torch in pot can be recommended the level corresponding from 75% to 150% ECA.
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