Análisis químico del extracto peciolar para evaluar el estado nutricional en la vid

Abstract

Resumen -El objetivo de este trabajo fue evaluar la relación existente entre la concentración de N, P y K del extracto peciolar, la lámina y la raíz, para determinar el estado nutricional de la vid. El ensayo se desarrolló entre diciembre de 2006 y febrero de 2007. Se validó la metodología de extracto peciolar para Vitis vinifera 'Red Globe', en plantas de un año de edad autoenraizadas, creciendo en macetas, a partir de tres ensayos de fertilización utilizando N, P 2 O 5 y K 2 O. En el extracto peciolar, se evaluó nitrato, fosfato y potasio, y en láminas y raíces, nitrógeno, fósforo y potasio. El análisis del extracto peciolar fue más sensible que el de la lámina y la raíz para determinar el estatus de nitrato y nitrógeno. Mientras que el análisis de la lámina representa mejor la respuesta de la planta a la fertilización con fósforo y potasio. El extracto peciolar puede detectar antagonismos entre elementos en altas dosis de fertilización.Términos para indexación: Vitis vinifera, análisis de savia, análisis de tejido, diagnóstico nutricional, 'Red Globe'. Petiole extract chemical analysis to evaluate nutritional status in grapevineAbstract -The objective of this work was to evaluate the relationship between N, P and K concentration in petiole extract, blades and roots, to determine the nutritional status in grapevine. The experiment was done between December 2006 and February 2007. Three fertilization trials with N, P 2 O 5 and K 2 O in one-year-old Vitis vinifera 'Red Globe' plants, grown in containers, were established. Nitrate, phosphate and potassium concentration were evaluated in the petiole extract, and nitrogen, phosphorus and potassium were determined in blades and roots. Petiole extract analysis was more sensitive than blade and root analysis to determine nitrate and nitrogen status. Meanwhile, blade analysis showed better plant response to fertilization with phosphorus and potassium. Petiole extract analysis can indicate the antagonism between nutrients under high doses of fertilization.

Influences of nitrogen inputs on nematode populations under highbush blueberry

“…These two studies suggest that sampling to 30 cm was likely adequate to represent the populations of R. robustus and P. crenatus , respectively, assuming that P. crenatus has similar ecological preferences as P. penetrans . In contrast, the vertical distribution of P. minor in annual cropping systems is known to vary seasonally and at times to be concentrated at depths well below 30 cm ( McSorley and Dickson, 1990 ; Perez et al, 2000 ). Assuming similar ecological preferences for P. renifer , such results suggest that our sampling strategy could have missed a significant portion of the P. renifer population.…”

Nutritional diagnosis of banana (Musa AAA Simmonds subgroup Cavendish) with root sap analysis1

“…The concentrations of nutrients in the root sap might differ from those in the leaves, because, after being absorbed, the plant distributes the nutrients among the organs depending on its functional needs at that time. The composition of the root sap changes during the ontogenesis of plants and its concentrations of elements and organic solutes vary according to the plant species, type of fertilization, age of the organ, climatic conditions, time of the year and time of sampling (Pino et al 2012, White 2012.…”

Sap Analysis: A Powerful Tool for Monitoring Plant Nutrition

“…After working with sap analysis in different fertilization levels, in [26], specific nutrient guidelines were defined for sap in grapevine (Table 5). One-year-old plants of Vitis vinifera 'Red Globe' were grown with three different increasing fertilization treatments: N (0, 2.56, 5.12, 7.68, and 9.60 g per plant), P 2 O 5 (0, 0.98, 1.47, 2.44, and 3.42 g per plant), and K 2 O (0, 2.30, 4.61, 6.91, and 9.22 g per plant) [72]. Following the methodology proposed by [25], sap NO 3 − -N, NH 4 + , PO 4 H 3 , and K were evaluated.…”