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Two experiments were carried out in a greenhouse to evaluate the variability in macronutrient contents in relation to growth regulator sprays on ‘Thompson Seedless’ and ‘Italia’ grapevines. The treatments were: chlormequat - 1,500mg L-1; daminozide - 3,000mg L-1; uniconazole - 30mg L-1; mepiquat chloride - 300mg .L-1 and control. The cuttings were grafted on the ‘Tropical’ rootstock and were rooted in sand. After 105 days of growth they were transplanted to 35L pots with a mixture of 1:1:1 volume of sand, soil and organic matter. Grapevines were pruned each 150 days, leaving two canes with six buds each for the ‘Italia’ cultivar and with fifteen buds for the ‘Thompson Seedless’ cultivar. Water was supplied through drip irrigation (1L/plant/day). Grapevines were fertilized with 1L of manure and micronutrient solution at each pruning. Macronutrients (MAP-1.45g, Ca2NO3-3.42g, urea-1.61g de , KCl-3.53g and MgSO4-1.94g) were suplied each 15 days during the plant growth. The petioles and the shoots were sampled each growth season (150 days) and dry matter was evaluated for yield and macronutrient contents (N, P, K, Ca and Mg). Results show that the spray of growth regulators induced alteration in the macronutrient patterns due to the decrease of shoot rate growth and increase in fruitfull shoots. Com o objetivo de avaliar a variação no teor de macronutrientes como resposta ao uso de reguladores de crescimento em videiras ‘Thompson Seedless’ e ‘Italia’, realizaram-se dois experimentos em casa-de-vegetação testando quatro (04) retardadores: chlormequat - 1.500mg L-1; daminozide - 3.000mg L-1; uniconazole - 30mg L-1; cloreto de mepiquat - 300mg L-1. As mudas das cultivares produtoras enxertadas sobre ‘Tropical’ foram transplantadas para vasos com 35L de uma mistura 1:1:1 em volume de areia, solo e composto orgânico. Após a poda, realizada a cada 150 dias, as videiras receberam 1L de solução com micronutrientes e 1L de composto orgânico. No correr de cada ciclo, adubou-se dez vezes as plantas com: 1,45g de MAP; 3,42g de nitrato de cálcio; 1,61g de uréia; 3,53g de cloreto de potássio e 1,94g de sulfato de magnésio. No fim de cada ciclo, podou-se o sistema aéreo, coletando-se os pecíolos das folhas e os ramos, que foram secos e pesados para determinação da massa de matéria seca. Após moagem, as amostras foram analisadas quanto ao teor de macronutrientes. As experiências realizadas com retardadores de crescimento, permitem concluir que não só é possível reduzir o ritmo de crescimento dos ramos nas plantas de videira das cultivares Thompson Seedless e Italia, bem como favorecer a alteração nos teores de nutrientes de modo a induzir a formação de gemas férteis, prerrogativas exploradas no presente trabalho

Growth retardants and nutrition characteristics of the Thompson seedless and Italia grape cultivars