Partição de nutrientes na parte aérea do meloeiro ‘Goldex’ fertirrigado

Abstract

Resumo: O meloeiro é uma das culturas que mais exportam nutrientes com a colheita dos frutos, sendo, ainda, uma das que menos restituem nutrientes ao solo, especialmente quando os restos culturais são retirados da área. Assim, objetivou-se determinar a extração de macro e de micronutrientes pelo fruto, assim como sua proporção em relação a parte aérea durante o desenvolvimento do melão amarelo. O experimento foi instalado segundo o delineamento em blocos casualizados, com quatro repetições. Os tratamentos corresponderam às cinco épocas de avaliação para os frutos, sendo: 35, 42, 49, 56 e 63 dias após o transplantio (DAT); e quatro épocas para as sementes: 42, 49, 56 e 63 DAT. Amostras de plantas foram subdivididas em folhas, caule, fruto (casca mais polpa) e semente. Nelas foram avaliadas as quantidades extraídas de macronutrientes e micronutrientes, bem como as proporções relativas dos nutrientes no fruto. Os nutrientes K, N e Ca são os mais extraídos, tanto pelo fruto quanto pela semente. Para os micronutrientes, têm-se as seguintes sequências de extração: Fe>Zn>B>Cu>Mn no fruto e Fe>Zn>Mn>B>Cu na semente. As proporções dos nutrientes no fruto aumentam continuamente durante seu desenvolvimento. As porcentagens extraídas de nutrientes pelo fruto, em relação a parte aérea total, segue a seguinte ordem: Cu>K>P>N>Zn>B>Mg>S>Fe>Mn>Ca. Palavras-chave: Cucumis melo. Demanda nutricional. Marcha de absorção. Redistribuição de nutrientes. Abstract:The melon is one of the crops that most export nutrients at harvesting, and is furthermore one of the crops that least restores nutrients to the soil, especially when the crop residue is removed from the area. The aim of this study therefore was to determine the extraction of macronutrients and micronutrients by the fruit, as well as their proportion in relation to the shoots, during development of the canary melon. The experiment was carried out in a randomised complete block design with four replications. The treatments corresponded to five periods of evaluation for the fruit: 35, 42, 49, 56 and 63 days after transplanting (DAT); and four periods for the seeds: 42, 49, 56 and 63 DAT. Plant samples were subdivided into leaves, stem, fruit (bark plus pulp) and seed. The extracted amounts of macronutrients and micronutrients were evaluated from the samples, as well as the relative proportion of nutrients in the fruit. The nutrients K, N and Ca are extracted most, both by the fruit and by the seed. For the micronutrients, the following extraction sequences

Agronomic Performance and Fruit Quality of Yellow Melon Fertilized With Doses of Nitrogen and Potassium

“…Subsequently, there was a reduction of this element in vegetative phytomass, and it was redirected to fruit formation. Results similar to that of the present study were reported by Araujo, Oliveira, and Oliveira (2016), who studied the partition of nutrients in 'Goldex' melon and obtained average N contents of 25.48 and 20.95 g kg -1 at 49 DAT and 63 DAT, respectively. At 62 DAT (Figure 2A), K showed a maximum value of 49.91g kg -1 with N and K fertilization of 50 and 15 kg ha -1 , respectively.…”

Marcha de absorção de nutrientes e crescimento do meloeiro ‘Gladial®’ fertirrigado

“…Mg is behaviorally similar to Ca. Although it is redistributed to a greater extent in the plant, Mg + has the xylematic pathway as the predominant pathway, and its availability in the soil influences its distribution to the reproductive organs of the plant (Araújo et al, 2017). However, the dynamics of accumulation in each part of the plant were similar to those found by Mendoza-Cortez et al ( 2014), with the leaves having the highest amounts observed, followed by the fruits and the stem with the lowest values.…”

“…The increase in each plant organ occurred in a quadratic manner, where the leaf alone accumulated approximately 75% of the total (903.88 g or 1.99 lb ha -1 ) at the 64 th DAE. This greater demand can be attributed to the role of Fe in the synthesis of chlorophyll and consequently in photosynthesis (Araújo et., 2017). However, the fruits only accumulated 264.33 g (0.58 lb) ha -1 at the 64 th DAE, which was 20% of the total Fe, in contrast to the findings of Melo et al (2013), where the fruits at 70 days after transplanting obtained a value of 8.48 mg plant -1 (141.33 g or 0.31 lb ha -1 ).…”

“…At the 64 th DAE, the plant accumulated 60.33 g (2.12 oz) ha -1 and the fruits were the main compartments of accumulation of this micronutrient, containing approximately 56% of the total extracted by the plant (30.87 g or 1.08 oz ha -1 ), which contrasts with what was observed in 'Goldex' melon, where 80% of Cu was accumulated in the fruits . This is because of its importance in carbohydrate, protein, and cell wall metabolism, N metabolism, and plant reproduction (Araújo et al, 2017).…”

Extração E Exportação De Nutrientes Em Frutos De Gravioleira

“…Em relação ao micronutriente Fe, Araújo et al (2016) trabalhando com frutos de meloeiro relataram comportamento similar ao verificado no presente estudo. Esses mesmo autores observaram que o fruto é o dreno preferencial deste micronutriente.…”