Use of the SPAD-502 in Estimating Nitrogen Content in Leaves and Grape Yield in Grapevines in Soils with Different Texture

Abstract

The SPAD reading may be used in estimating total nitrogen content (N) in leaves and even in estimating grape yield in grapevines. The objective of this study was to estimate total N content in leaves and grape yield using the SPAD-502 in grapevines submitted to nitrogen fertilization in soils with clayey and sandy texture. In 2008, two experiments were installed in the Southern region of Brazil. In experiment 1, Cabernet Sauvignon grapevines were planted in a soil with clayey texture and with application of 10, 20, 40 and 80 kg·N·ha<sup>-1</sup>·year<sup>-1</sup>. In experiment 2, Cabernet Sauvignon grapevines were planted in a soil with sandy texture and with the application of 0, 10, 15, 20, 40, 80 and 120 kg·N·ha<sup>-1</sup>·year<sup>-1</sup>. In the grapevines of the two experiments and during the period from 2008 to 2010, SPAD readings were made on leaves throughout the flowering period and at change in color of the berries using the portable chlorophyll meter Minolta-SPAD-502. The leaves were collected, dried, ground and submitted to analysis of the total N content. In addition, grape yield per hectare was evaluated. The SPAD-502 readings estimated the total N content in flowering and at change in color of the berries in the Cabernet Sauvignon grapevines grown on soils with clayey texture and sandy texture, especially in the first year of evaluation. However, the precision of the SPAD-502 readings is low, with there being no relationship between the SPAD-502 readings and grape yield

Nutrients Assimilation and Chlorophyll Contents for Different Grapevine Varieties in Calcareous Soils in the Somontano DO (Spain)

“…Another approach would consist in non-destructive measurements of chlorophyll content on the basis of the absorbance in the red and infrared regions (SPAD) [22]. This technique has been successfully used in other species [23] and, in the case of grapevine, several authors have shown that it can be used to estimate N content in the leaves [24,25]. Finally, other non-destructive techniques for vigor, LIC and other phytopathologies assessment based on drones (UAVs) or satellites are also receiving increasing attention [26,27].…”

Nitrogen fertilization in the growth phase of 'Chardonnay' and 'Pinot Noir' vines and nitrogen forms in sandy soil of the Pampa Biome

“…Em 30 de março de 2013, primeiro ciclo de crescimento das videiras e, em 22 de dezembro de 2012, segundo ciclo de crescimento, foram determinadas a altura de planta, com trena métrica, o diâmetro de caule a 10 cm acima do enxerto, com paquímetro, e as leituras SPAD, usando-se clorofilômetro (SPAD-502), em cinco folhas em cada planta, segundo procedimento descrito por Brunetto et al (2012) . O N mineral foi obtido pela soma de N-NH 4 + e N-NO 3 , já que os teores de N-NO 2 , em pré-testes, foram insignificantes.…”

Características Químicas De Solo Com Viticultura Orgânica E Biodinâmica

“…Amostragem em maio Amostragem em setembro (Brunetto et al, 2007;Mafra et al, 2011;Brunetto et al, 2012).…”