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

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American Journal of Plant Sciences 2012年第11期3卷 1546-1561页

作者： Gustavo Brunetto Gustavo Trentin Carlos Alberto Ceretta Eduardo Girotto Felipe Lorensini Alcione Miotto Glaucia Regina Zaferi Moser George Wellington de Melo Department of Rural Engineering Program in Agricultural EcosystemsUniversidade Federal de Santa Catarina(UFSC)Flori-anopolisBrazil Embrapa Pecuária Sul BagéBrazil Program in Soil Science Departamento de Solos(DS)Universidade Federal de Santa Maria(UFSM)Santa MariaBrazil Embrapa Uva e Vinho Bento GoncalvesBrazil

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-1·year-1. 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-1·year-1. 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.

关键词： SPAD-Readings Non Destructive Estimation foliar nitrogen Leaf Analysis Vitis vinifera

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