Nitrogen and potassium fertilization in yield and macronutrients contents of heliconia cv. Golden Torch

Abstract

A B S T R A C TThis study aimed to evaluate the effect of nitrogen (N) and potassium (K) fertilization in yield and contents of macronutrients in heliconia plants (Heliconia psittacorum x Heliconia spathocircinata Aristeguieta) cv. Golden Torch. The experiment was set in a randomized block design, in a 4 x 4 factorial, corresponding to N doses (0, 120, 180 and 240 g of N hole -1 ) and K doses (0, 120, 180 and 240 g of K 2 O hole -1 ) with four replicates and five rhizomes per plot, under field conditions. After one year of cultivation, yield (number of flower stems per square meter) and the leaf contents of N, P, K, Ca, Mg and S were determined. The applied N doses did not influence either yield or the leaf contents of the evaluated macronutrients. K fertilization favored the increase in leaf K content and the decrease in the contents of P, Ca and Mg in leaves of heliconias. Under the conditions of this experiment, it is recommended to apply 161.46 g of K 2 O hole -1 for a maximum yield of 9.89 stems m -2 per month.Adubação nitrogenada e potássica na produtividade e teores de macronutrientes em helicônia cv. Golden Torch R E S U M O Realizou-se este estudo com o objetivo de avaliar o efeito da adubação nitrogenada e potássica na produtividade e teores de macronutrientes em plantas de helicônia (Heliconia psittacorum x Heliconia spathocircinata Aristeguieta) cv. Golden Torch. O experimento foi conduzido segundo um delineamento experimental em blocos casualizados em esquema fatorial 4 x 4 correspondentes às doses de nitrogênio (0, 120, 180 e 240 g cova -1 de N) e de potássio (0, 120, 180 e 240 g cova -1 de K 2 O) com quatro repetições e cinco rizomas por parcela, em condições de campo. Após um ano de cultivo determinaram-se a produtividade em termos de número de hastes florais por metro quadrado e os teores foliares de N, P, K, Ca, Mg e S. As doses de nitrogênio aplicadas não exerceram influência na produtividade nem nos teores foliares dos macronutrientes avaliados. A fertilização potássica favoreceu o aumento do teor de K foliar e o decréscimo dos teores de P, Ca e Mg foliares; recomendamse, nas condições em que o experimento foi desenvolvido, 161,46 g cova -1 de K 2 O para a produtividade máxima de 9,89 hastes m -2 ao mês. Key words:Heliconia psittacorum floriculture fertilization nutritional status Palavras-chave:Heliconia psittacorum floricultura fertilização estado nutricional

Methodologies for the application of calcium compounds in agropastoral systems: Effects on crop yields

“…The application of 2,350 kg LS ha −1 plus 1,500 kg PG ha −1 in the 2017/18 season and LS and PG to ensure that Ca 2+ occupied 65% of CEC in the 0.0‐to‐0.2‐m layer and 50% of ECEC in the 0.2‐to‐0.4‐m layer in the 2018/19 season (T3) promoted disequilibrium of the absorption of Ca 2+ , Mg 2+ , and K + and, consequently, reduced maize grain yield. The absorption of Ca 2+ , Mg 2+ , and K + is competitive, and an excess of one of these elements decreases the absorption of the others (Marschner, 2005), leading to reduced growth and production of some crops (Beckmann‐Cavalcante et al., 2016). Such competitive binding was promoted by the high supply of Ca 2+ provided by PG, which contained 17% CaO, and by LS, which contained 42% CaO.…”

“…There is competition among Ca 2+ , Mg 2+ , and K + in soil (Marschner, 2005). Calcium ion, Mg 2+ , and K + share binding sites in the transporters located in the plasma membrane of root cells, and thus an increase in the soil concentration of one ion will lead to competitive inhibition of binding of the others (Beckmann-Cavalcante et al, 2016). Hydrated lime was also a source of Mg 2+ up to a depth of 0.57 m. According to Hungria et al (2007), Mg plays a very important indirect role in the biological fixation of atmospheric nitrogen (N 2 ), is a component of chlorophyll, and participates in the transfer of energy during photosynthesis.…”

Growth and nutrients content of heliconia under mineral fertilization

“…Moreover, in the nutrition of heliconia and species of the order Zingiberales, nitrogen and phosphorus significantly increases the parameters of vegetative growth, flowering and yield in number of floral stems m 2 (Patel et al, 2017). Potassium affects the performance of the floral stem and the content of P, K, Ca and Mg in leaves, besides the increase in the doses of K 2 O in the soil cause a reduction in the P content of the leaves (Beckmann-Cavalcante et al, 2016). In general, N, P and K improve the vegetative growth and yield of floral stems and rhizomes (Goh et al, 2018) In this ornamental species, fertilizers are required to be applied in correct doses (Stewart et al, 2005) and distributed or adjusted to the requirements of the plant in each phase of growth and development (Gowda et al, 1988).…”