Aplicação de GA 3 e anelamento de ramos na produção de frutos extemporâneos de limeiras ácidas 'Tahiti'Objetivou-se, neste trabalho, avaliar os efeitos do anelamento de ramos e da aplicação de GA 3 , ainda na florada da safra principal, sobre a formação de estruturas reprodutivas, o pegamento e a produção de frutos da florada subsequente, extemporânea, de limeira ácida 'Tahiti'. Utilizou-se o delineamento experimental em blocos casualizados, com cinco repetições, em esquema fatorial 4 x 3. O primeiro fator foi a aplicação foliar de GA 3 , 88 dias antes da florada extemporânea, nas concentrações (0, 7, 14 e 21 mg.L -1 ). O segundo fator foram as épocas de anelamento, 108 dias antes do início do florescimento (A108AF), 78 dias antes do florescimento (A78AF), mais a testemunha, sem anelamento (SA). Na florada extemporânea, as proporções de botões florais, flores e frutos que sofreram abscisão foram de 38,75; 31,25 e 18,64%, respectivamente, e foram colhidas 11,34% de todas as estruturas reprodutivas formadas. O GA 3 não alterou o pegamento. O anelamento aumentou o pegamento dos frutos em 229 e 256%, aos A108DAF e A78DAF, respectivamente, em relação às plantas SA. O GA 3 reduziu a formação de estruturas florais, fato que propiciou aumento, de forma quadrática, da produção, por reduzir a concorrência por fotoassimilados entre os frutos, sendo a concentração de 21 mg.L -1 a mais produtiva, com 15,97 frutos.planta -1 .Palavras-chave: giberelina, floração, estruturas reprodutivas, floema. Application of GA 3 and girdling of branches on the production of extemporaneous fruits of 'Tahiti' acid limeThe objective of this study was to evaluate the effect of girdling of branches and the application of GA 3 , still in the main crop flowering on the formation of reproductive structures, the fruit set of the following extemporaneous flowering of 'Tahiti' acid lime. This work used a randomized block design with five replications in a 4x3 factorial design. The first factor was the foliar application of GA 3 , 88 days before extemporaneous flowering at five concentrations (0, 7, 14 and 21 mg.L -1 ). The second factor was the girdling times, 108 days before flowering onset (A108AF), 78 days before flowering (A78AF) plus no-girdling control (NG). In extemporaneous flowering, the proportion of buds, flowers and fruits that abscised was 38.75, 31.25 and 18.64% respectively and 11.34% of all reproductive structures formed were collected. GA 3 did not affect fruit set. Girdling increased fruit set by 229 and 256% at A108DAF and A78DAF respectively, in relation to NG plants. The GA 3 reduced the formation of floral structures, which resulted in a quadratic increase in field production by reducing the competition for photoassimilates among fruits. The concentration of 21 mg.L -1 was the most productive, with 15.97 fruit.plant -1 .
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