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- Title
NO<sub>3</sub><sup>-</sup>, K<sup>+</sup>, and chlorophyll index in fertigated grapevines in the semi-arid region of Brazil.
- Authors
Oliveira da Silva, Alexsandro; José Silva, Davi; Henrique Bassoi, Luis; de Melo Chaves, Agnaldo Rodrigues
- Abstract
Evaluating the effects of N and K supply on grapevines (Vitis vinifera L.) and the techniques for nutritional diagnosis is of great importance for fertigation management of this crop. This study evaluated the effects of N and K fertigation on the soluble concentrations of NO3 - and K+ in the petiole sap and on the leaf chlorophyll index in drip irrigated 'Syrah' grapevine (from 17 June 2013 to 25 Nov 2014). The treatments consisted of five levels of N (0, 15, 30, 60 and 120 kg ha-1) and K2O (0, 15, 30, 60 and 120 kg ha-1), combined in an incomplete 52 factorial scheme in 13 combinations and arranged in randomized blocks with four replications. We determined NO3 - and K+ concentrations in petiole sap, leaf chlorophyll index, grapevine cluster mass and number per plant, mean grapevine cluster mass, and phenolic composition. High NO3 - concentrations contributed positively to grapevine yield; however, increased K+ concentrations caused a negative response of sap. For 120 kg N ha-1 rate, NO3 - in the sap and chlorophyll index showed higher values at the flowering stage, while high values for K+ were observed during the grape-ripening stage.
- Subjects
BRAZIL; ARID regions; CHLOROPHYLL; GRAPES; CROP management; FERTIGATION; VITIS vinifera; SYRAH
- Publication
Scientia Agricola, 2023, Vol 80, p1
- ISSN
0103-9016
- Publication type
Article
- DOI
10.1590/1678-992X-2021-0122