Diagnose nutricional de variedades de cana-de-açúcar em argissolos

Abstract

A diagnose foliar é um dos métodos mais utilizados para se avaliar a demanda de nutrientes na cultura da cana-de-açúcar, contribuindo para um manejo melhor de fertilizantes. Objetivou-se avaliar o estado nutricional de variedades de cana-de-açúcar através da análise foliar e a mensuração dos teores foliares de macro e micronutrientes. Foram avaliadas as seguintes variedades: RB92579, RB867515, SP81-3250, VAT90-212, VAT90-61, SP83-2847, RB863129, RB931011, RB931566 e RB855113, em dois tipos de solo: Argisssolo Amarelo Distrocoeso Fragipânico (PAdx1) e Argisssolo Amarelo Distrocoeso Abrúptico Fragipânico (PAdx2) na Usina Cansanção de Sinimbú, Jequia da Praia-AL. O delineamento foi o de blocos casualizados arranjado em um fatorial de 2 x 10 consistindo de 10 variedades e quatro repetições para cada solo em estudo, quando foram avaliados os seguintes nutrientes: N, P, K, Ca, Mg, S, Zn, Fe, Mn, Cu e B. O PAdx2 foi o solo que disponibilizou, às plantas, maior quantidade de nutrientes em relação aos nutrientes P, Ca, Mg, Zn e Fe. A variedade SP81-3250 apresentou o melhor desempenho quanto ao teor foliar de nutrientes (K, S, Fe, Mn e Cu) seguida pela RB931011, VAT90-61 e RB867515.

Inoculation With Growth-Promoting Bacteria Associated With the Reduction of Phosphate Fertilization in Sugarcane

“…Phosphorous plays an important role in the synthesis of different compounds of cells, phosphate-sugar catalyzes, photosynthesis and respiration, as well as help in the synthesis of cell membrane components (phospholipids), nucleotides (ATP), DNA and RNA (Taiz et al, 2017). Leaf analysis is one of the most commonly used methods to evaluate the demand of nutrients in sugarcane crop and contribution in fertilizers management (Moura Filho et al, 2014). The leaf P concentrations of all treatments (Table 4) are within the range (1.5-3.0 g kg −1 ), considered appropriate P content for the crop growth according to Raij and Cantarella (1997).…”

Growth and yield of sugarcane as a function of phosphorus doses and forms of application

“…The expansion of sugarcane fields in Brazil has been intensified because of the increasing demand for biofuels, especially from ethanol and sugar production, its main product (Ferreira Júnior et al, 2012;Moura Filho et al, 2014). Brazil is the global leader in sugarcane production, with about 634.8 million tons per season.…”

Visual symptoms and nutritional deficiencies in olive trees under subjected to nutrient deprivation

“…The omission caused wrinkling (shriveling) of the edges of older leaves and slight chlorosis, which is similar to the effects described by Alves, Prado, Gondim, Fonseca, and Cecílio Filho (2008), who initially observed intense purpura of the roots that, with the evolution of the deficiency, was also verified in the leaves. Phosphorus is significant in several plant functions, exerting a prominent role in the formation of proteins and several other processes, such as photosynthesis, cell division and energy storage (Bastos, Costa, Silva, Raposo, & Souto, 2008;Gebrim et al, 2010;Korndorfer & Mello, 2009;Simões Neto et al, 2009;Moura Filho et al, 2014). Although P is an essential macro-element, it is not commonly applied during olive cultivation (Fernández-Escobar, 2010).…”