Response of eggplant crop fertigated with doses of nitrogen and potassium

Abstract

A B S T R A C TThe objective of the present study was to evaluate the response of eggplant, cv. 'Ciça' , with respect to yield, number of fruits and dry matter (root and stem), when grown in a greenhouse and conducted under fertigation with nitrogen and potassium. Resposta da cultura da berinjela fertirrigada com doses de nitrogênio e potássio R E S U M O Objetivou-se, no presente estudo, avaliar a resposta da cultura da berinjela, cultivar Ciça, com relação à produtividade, número de frutos e massa seca (raiz e caule), quando cultivada em ambiente protegido e conduzida sob fertirrigação com nitrogênio e potássio. O experimento foi conduzido no Centro Técnico de Irrigação da Universidade Estadual de Maringá, entre os meses de fevereiro e agosto de 2015. Foram testadas quatro doses de nitrogênio (0,0; 6,43; 12,86 e 25,72 g de N planta -1 ) e quatro doses de potássio (0,0; 5,18; 10,36 e 20,73 g de K planta -1 ), perfazendo 16 tratamentos em esquema fatorial 4 x 4, dispostos em delineamento inteiramente casualizado com quatro repetições, em Latossolo vermelho distrófico, de textura arenosa. O maior número de frutos por planta e produtividade foi obtido na dose entre 14-17 g de N planta -1 (145-177 kg ha -1 ). Doses isoladas de potássio não influenciaram estatisticamente a produtividade nem a massa seca de raiz.

Yield of the Okra Submitted to Nitrogen Rates and Wastewater in Northeast Brazilian Semiarid Region

“…Akintomide and Osundare (2015) also reported a significant response of okra LA with N fertilization. Other authors like, Souza et al (2016), and Souza et al (2017) observed positive responses of N fertilization on the LA of several agricultural crops.…”

“…The minimum LA observed in the absence of N may be attributed to the poor nutritional status of the plants subjected to this treatment, which has resulted in delayed leaf expansion (Olaniyi et al, 2010;Souza et al, 2016;Zubairu et al, 2017). The positive effect of N on LA is related to the functions performed by this nutrient on the development of cultures, since this element helps in cell division and stretching; it plays an important role in chlorophyll, protein, nucleic acid, hormones, and synthesis of vitamins (Omotoso & Shittu, 2007;Akande et al, 2010;Souza et al, 2017). In addition, it was found that LA responds positively to this element when supplied in adequate quantity .…”

“…Since N deficiency results in delayed plant growth, thin stems, and less leaf expansion (Zubairu et al, 2017), excess deficiency caused restrictions as it promotes the saline effect in the soil, resulting in nutritional imbalance (Medeiros et al, 2015). In addition, it can prolong the vegetative cycle of the plant and delay flowering, which may cause oxidative damages that compromise important cellular components such as lipids, proteins, DNA, RNA and reducing plant growth, and yield (Akande et al, 2010;Medeiros et al, 2015;Medeiros et al, 2017;Souza et al, 2017;Zubairu et al, 2017).…”

“…This element, when supplied in adequate amounts, promotes significant increases in the stages of growth and development of plants, as they participate in their metabolism through enzymes, amino acids, proteins, pigments and nucleic acids, fundamental constituents of protoplasm, and chlorophyll during the process of photosynthesis (Oliveira et al, 2003;Akande et al, 2010;Olaniyi et al, 2010;Oliveira et al, 2014;Medeiros et al, 2015;Souza et al, 2017).…”

Effect of fertigation with potassium and nitrogen on gas exchange and biomass accumulation in eggplant1

“…Com exceção do K para a eficiência do uso da água e N para a concentração interna de CO 2 , todos os outros parâmetros de trocas gasosas apresentaram diferenças significativas para as doses de K e N. Houve interação entre as doses de N e K para fotossíntese, condutância estomática, transpiração e eficiência instantânea de carboxilação. Os maiores valores para fotossíntese líquida, condutância estomática, transpiração, eficiência de carboxilação instantânea e matéria seca total foram encontrados na faixa de 125-185 kg ha -1 de K e 215-268 kg ha -1 de N. Souza et al 2017), the physiological responses of eggplants under K and N doses have not been well documented. The photosynthesis, transpiration, stomatal conductance and internal CO 2 concentration may be used to diagnose physiological alterations in plants submitted to adverse conditions (Andrade Junior et al 2011).…”