Composição mineral e sintomas visuais de deficiências de nutrientes em plantas de pimenta-longa (Piper hispidinervum C. DC.)

Abstract

A pimenta-longa (Piper hispidinervum C. DC.) é uma das principais fontes alternativas para a produção de safrol empregado como matéria prima na fabricação de inseticidas naturais e aromatizantes. O objetivo da pesquisa foi avaliar o efeito da omissão dos macronutrientes e micronutrientes, sobre a composição mineral de plantas de pimenta-longa, e caracterizar os sintomas de deficiências decorrentes dessa limitação, utilizando-se da técnica do elemento faltante. O experimento foi conduzido em casa de vegetação, com quatro repetições e doze tratamentos, completo e omissão individual de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn e Zn em delineamento inteiramente ao acaso. Os valores dos teores foliares nos tratamentos com omissão dos nutrientes foram inferiores àqueles obtidos no tratamento completo. As omissões individuais dos nutrientes promoveram alterações na composição mineral de macro e micronutrientes. Os teores de macronutrientes (g kg Mineral composition and visual symptoms of nutrients deficiencies in long pepper plants (Piper hispidinervum C. DC.) abstRaCtThe long pepper (Piper hispidinervum C. DC.) is one of the main alternative sources for the production of safrol used as raw material in the manufacture of insecticides and natural flavoring. The objective of this research was to evaluate the effect of omission macronutrients and micronutrients, on the mineral composition of long pepper plants, and featuring the symptoms of deficiencies resulting from this limitation, using the missing element technique. The experiment was conducted in a greenhouse, with four replicates and twelve treatments, complete and individual omission of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn in a completely randomized design. Foliar levels in treatments with the omission of nutrients were lower than those obtained in the complete treatment. The omission of individual nutrients promotes changes in the mineral composition of macro and micronutrients. The levels of macronutrients (g kg

Organic Residues and Bokashi Influence in the Growth of Alibertia edulis

“…The potential quantum efficiency of the PS II (F v /F m ) of the leaves of the marmelodo-cerrado was higher when cultivated in the PMH, differing statistically from PMW only (Table 5); consequently, the effective efficiency of the absorbed energy conversion (F v /F 0 ) was similar, most likely owing to the higher nutrient content in the substrate (Table 2), especially phosphorus, magnesium and nitrogen present in organic residues (Table 1). Phosphorus acts as a source of energy in the electron transport (Veigas et al, 2013), increasing the efficiency of the leaves in the conversion of absorbed energy (F v /F 0 ), which was consistent with an increase in F v associated with electron transferability.…”

Visual Symptoms, Vegetative Growth, and Mineral Concentration in Fig Tree (Ficus carica L.) Under Macronutrient Deficiencies

“…[32], Saccharum officinarum L. [33], Piper hispidinervum C. DC. [34], Swietenia macrophylla King. [35] and Heliconia psittacorum L. f. [36], which matches the results found in our investigation.…”

Effect of Magnesium on Gas Exchange and Photosynthetic Efficiency of Coffee Plants Grown under Different Light Levels

“…This inhibition between these nutrients is competitive, that is, there is competition by the same site of the "carriers" in the membrane [19]. The antagonistic relationship between Mg and K was observed in experiments with several cultures [20][21][22].…”