Estado nutricional da melancia fertirrigada com doses de nitrogênio e fósforo

Abstract

ResumoO objetivo deste trabalho foi avaliar o efeito de doses de N e P 2 O 5 via água de irrigação na absorção de macro e micronutrientes pela cultura da melancia. O experimento foi realizado na Fazenda Santa Luzia, localizada no município de Baraúna -RN (5° 05' 57"S e 37° 33' 16"W). O delineamento experimental utilizado foi em blocos inteiramente casualizados em arranjo fatorial com cultivo em faixas (4 x 4) x 2, resultando em 32 tratamentos, com três repetições. Os tratamentos foram formados por quatro doses de nitrogênio -N (0; 48; 121; 218 kg ha -1 ) combinadas com quatro doses de fósforo -P 2 O 5 (0; 88; 220; 397 kg ha -1 ) com duas cultivares de melancia. Em nenhum dos tratamentos foi encontrado deficiência de N, P, K, Ca, Mg, Fe e Mn nas folhas da melancia, com exceção de Cu e Zn. As doses de N e P 2 O 5 , bem como as suas interações, proporcionaram efeito significativo sobre os teores dos macronutrientes nas folhas da melancia. Os macronutrientes mais absorvidos pelas folhas da melancia foram N>Ca>K>Mg>P. Palavras-chave: Citrullus lanatus, análise foliar, macronutrientes, micronutrientes AbstractThe objective of this work was to evaluate the effect of N and P 2 O 5 rates through irrigation water on the uptake of macro and micronutrients by watermelon crop. The study was conducted at the farm Santa Luzia, in Baraúna, in the State of Rio Grande do Norte, Brazil (5° 05' 57"S e 37° 33' 16"W). The experimental design was completely randomized blocks with strip cropping (4 x 4) x 2, resulting and thirty two treatments with three replicates. The treatments consisted in the application of four N rates (0; 48; 121; 218 kg ha -1 ) combined with four rates of P 2 O 5 (0; 88; 220; 397 kg ha -1 ) with two cultivars of watermelon. No deficiency of N, P, K, Ca, Mg, Fe and Mn in the watermelon leaves was found in any treatment, excepting Cu and Zn. The N and P 2 O 5 rates, as well as the interaction, provide significant effect on contents of macronutrients in the watermelon leaves. Macronutrients most absorbed by the leaves of watermelon were N>Ca>K>Mg>P.

Frequência Da Fertirrigação Fosfatada Na Produtividade Da Cultura Da Melancia

“…Os resultados encontrados nesse estudo corroboram a afirmativa de que o uso da fertirrigação proporciona incrementos na produtividade e a melhoria na qualidade dos frutos, pois possibilita o fornecimento de nutrientes no momento adequado e na quantidade desejada, aplicando o nutriente nas imediações do sistema radicular da planta, o que possibilita uma melhor eficiência na absorção de nutrientes (SOUZA et al, 2014).…”

Chemical Fertilization Through Fertirrigation in the Evaluation of the Biochemical Characteristics of the Watermelon Fruits

“…Among the nutrients, potassium (K) and phosphorus (P) are the nutrients most absorbed by the plant (Oliveira et al, 2015) In watermelon culture, mineral nutrition is one of the most important factors because it directly contributes to the productivity and quality of the fruits. Fertilization is a preponderant point in the increase in the quality of watermelon fruits, and an unbalanced fertilization has caused damage to production and damage to the physical and chemical characteristics of the soil (Souza, 2014).…”

“…Potassium (K) is the nutrient most extracted from the soil by melons (45%), fruit from the same family as watermelon, and its deficiency reduces root growth, increases plant mating, plant susceptibility and decreases resistance to water stress (Almeida et al, 2014). Excess gives the plants symptoms similar to excess salinity, in addition to the occurrence of induced calcium and magnesium deficiency (Souza, 2014). Potassium also influences the quality characteristics of watermelon, as it is indispensable for the formation and ripening of the fruits and for the increase of their texture (Lucena et al, 2011).…”

Impact of Nitrogen Fertigation on Watermelon Yield Grown on the Very Light Soil in Poland

“…In the experiment carried out by Araújo et al [6] increasing nitrogen doses resulted in better watermelon plant growth, higher fruit yield, as well as dry matter content, but not influenced the fruits pH, and reduced sugar content. Souza et al [7] noticed that nitrogen and phosphorus fertigation has a positive effect on watermelon yield, because it allows avoiding deficiency of macronutrients such as N, P, K, Ca, Mg, Fe and Mn. Santos et al [8] also noted better watermelon fruit yield and quality with nitrogen fertigation doses increasing, but at the same time it leads to the stronger infestation by diseases such as gummy stem blight and the downy mildew.…”

“…Rolbiecki et al [21,22] reported a notably beneficial effect of irrigation and fertigation on the yielding of watermelon cultivated on fine sand. Additionally, Rolbiecki et al [22], Wakindiki and Kirambia [14], Costa et al [23] and Souza et al [7] comparing the effect of irrigation and fertilization on the yield characteristics of different watermelon cultivars have observed a significant influence of genetic factors on the studied traits.…”