Yield and critical levels of P in ‘Cabernet Sauvignon’ vineyards grown in subtropical soils.
2025
MOURA-BUENO, J. M. | CIOTTA, M. N. | BETEMPS, D. L. | FELIPPETO, J. | NAVA, G. | STEFANELLO, L. O. | TASSINARI A. | SCHMITT, D. S. | RAMOS, R. F. | BROWN, P. H. | BRUNETTO, G. | JEAN M. MOURA-BUENO, UNIVERSIDADE FEDERAL DE SANTA MARIA; MARLISE NARA CIOTTA, EMPRESA DE PESQUISA AGROPECUÁRIA E EXTENSÃO RURAL DE SANTA CATARINA; DÉBORA L. BETEMPS, UNIVERSIDADE FEDERAL DA FRONTEIRA SUL; JOÃO FELIPPETO, EMPRESA DE PESQUISA AGROPECUÁRIA E EXTENSÃO RURAL DE SANTA CATARINA; GILBERTO NAVA, CPACT; LINCON O. STEFANELLO, UNIVERSIDADE FEDERAL DE SANTA MARIA; ADRIELE TASSINARI, UNIVERSIDADE FEDERAL DE SANTA MARIA; DJALMA E. SCHMITT, UNIVERSIDADE FEDERAL DE SANTA CATARINA; RODRIGO F. RAMOS, UNIVERSIDADE FEDERAL DE SANTA MARIA; PATRICK H. BROWN, UNIVERSITY OF CALIFORNIA; GUSTAVO BRUNETTO, UNIVERSIDADE FEDERAL DE SANTA MARIA.
Abstract Tropical and subtropical soils in vineyards show high phosphorus (P) adsorption ability and, consequently, low P availability to plants. However, P critical levels (CL) and sufficiency ranges (SR) in soils and leaves in subtropical regions for yield and the must variables remain unknown. This study aimed to assess the yield response of ‘Cabernet Sauvignon’ grown in acidic soils with a high organic matter content in subtropical regions and to suggest CL and SR of P in the soil and leaves using bayesian change point quantile regression models. The study was carried out in the 2013/14, 2014/15, 2015/16, 2016/17, and 2017/18 crop seasons in a vineyard located in southern Brazil, treated with 0, 13, 26, 40, and 52 kg Pha-1 year-1, which were assessed. The P availability in the soil was determined by Mehlich-1. The P in leaves (veraison), yield parameters, and must composition were evaluated. Phosphate fertilizer applications to ‘Cabernet Sauvignon’ increased soil P, mainly on the soil surface. However, it did not increase the P concentration in leaves or influence yield or alter must pH and composition, such as pH, total soluble solids (TSS), total titratable acidity (TTA), and total polyphenols (TP). While P treatments had no effect on yield and fruit quality it was possible to utilize natural variation and Bayesian change point quantile regression models to determine CL’s for various attributes. The CL of P in the 0-20 cm soil layer was 13.2 mg dm-3. The CL of P in leaves, regarding yield, TSS, and TTA, was 0.61, 0.88, and 0.52%, respectively.
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