Hylocereus sp AIB Cactaceae Cladódios Estiolamento KEYWORDS Hylocereus sp IBA Cactaceae Cladodes Banding RESUMO: Apesar de ser considerada uma cultura com grande potencial para a diversificação da fruticultura brasileira, ainda existem diversos aspectos pouco elucidados sobre o manejo de pitaia vermelha, particularmente na propagação vegetativa. Diante disso, objetivou-se avaliar o efeito de enraizadores e tipos de estacas no enraizamento de pitaia vermelha. O experimento foi conduzido em casa de vegetação, onde testaram-se enraizadores [ausência, dose recomendada de AIB (ácido indolbutírico) (3.000 mg L-1) e gel enraizador comercial] e tipos de estaca-estiolada, padrão e vigorosa. Os níveis de ambos os fatores foram arranjados em esquema fatorial 3 × 3, com quatro blocos ao acaso e duas plantas úteis por parcela. Aos 90 dias, avaliou-se: sobrevivência e enraizamento de estacas, comprimento da maior raiz (CR), largura radicular (LR), massa fresca das raízes (MFR), massa seca das raízes (MSR), massa fresca da parte aérea (MFPA), massa seca da parte aérea (MSPA), massa seca total (MST), número de emissões laterais (NEL), somatório do comprimento de emissões laterais (SCEL) e relação parte aérea raiz (RPAR). Concluiu-se que o uso de enraizadores e os tipos de estacas afetam o enraizamento de pitaia vermelha. As estacas vigorosas dispensam o uso de enraizadores e são as mais recomendadas para o sistema de produção de mudas de pitaia vermelha. Na escassez de estacas vigorosas, é conveniente a aplicação de gel enraizador para melhorar o enraizamento de mudas propagadas por estacas padrão ou estioladas.
Although there has been a significant expansion of red pitaya cultivation in Brazil and other countries around the world, its cultivation requires scientific expertise to identify the plant production systems best suited to Brazilian soils and climate. Therefore, this study aimed to evaluate the effect of exogenous auxin and shading of the parental stock plants on the subsequent quality of red pitaya cuttings. The use of a commercial rooting auxin (with and without) and five shading levels on stock plants (full sun, 35, 50, 65 and 80% shading) were tested via four randomized blocks in a factorial 2x5 scheme with two plants per plot. After 90 days, the following vegetative characteristics were evaluated: length of the longest root (LR), root dry mass (RDM), root width (RW), shoot fresh weight (SFW) and shoot dry weight (SDW), total dry weight (TDW), number of axillary shoots (NAS), sum of the length of the axillary shoots (SLAS), and shoot:root ratio (SRR). We concluded that for the production of high quality plants, collecting cuttings from stock plants grown in full sun or 80% shade is recommended, eliminating the need to use commercial rooting auxin.
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Aspects related to tomato (Solanum lycopersicum L.) mineral nutrition are important for the production of quality fruits. The cherry tomato (Solanum lycopersicum var. cerasiforme) is an alternative for most producers due to its high market value, greater productivity and good acceptance by consumers. The objective with this study was to evaluate the nutritional status of cherry tomatoes cultivated in nutrient solution under omission of macronutrients. The experiment was conducted in a completely randomized design, with seven treatments: complete nutrient solution and omissions of N, P, K, Ca, Mg and S, with five replicates. Visible symptoms of nutritional deficiency were observed in the following order of omission: at 5, 12 and 20 days after transplantation in plants under omission of N, P and K, respectively. Conversely, there were no visible symptoms of deficiency under omissions of Ca, Mg and S. The sequence of growth limitation, determined based on the shoot dry mass of cherry tomato plants, was: N>P>S>Mg>Ca>K. The omission of a nutrient, besides reducing its content in the leaf tissue, causes imbalance between the other nutrients, influencing the parameters of growth and production, leading to morphological manifestations in cherry tomato.
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