GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE

GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE

A study was carried out on seven-year old ?Valencia? orange trees, growing in a clay loam soil to shift the harvesting period from January-March (normal) to May-August when fruit gets the highest price. GA3 25 mg L-1 was applied twice (December 12th and 26th, 1990) to reduce the late winter flowering. In addition, at 80 % of petal fall, CEPA 1000 mL L-1 + urea 2 % was sprayed to reduce fruit number (March, 1991). To stimulate summer flowering, CEPA 250 mL L-1 was applied in mid-April, when fruitlets diameter was 1.5 cm, together with low-biuret urea at the rate of 210 g N per tree divided in two applications: 60 g on April 23 and 150 g on May 29. These treatments were applied before the completion of natural soil moisture stress. In winter as a result of GA3 treatment, the number of flowers and shoots per m2 of canopy decreased in 24 and 28 %, respectively. CEPA + urea in a 2nd stage, got 95 % of fruitlets thinning and further stimulated vegetative flushes and blooming in April, at levels four to five times greater than in control trees. However, strong defoliation and even shoot tip burning was observed in treated trees. Summer flowering intensity was increased because of the GA3 applied on December as well as the urea sprayed on April and May, but only urea increased summer production. Neither thinning of fruitlets, in winter, nor applying CEPA alone in April were effective in increasing the size of the spring and/or summer harvest.

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Main Authors: Curti-Díaz, Sergio A., Mosqueda-Vázquez, Raúl, Rodríguez-Peña, Manuel A.
Format: Digital revista
Language:spa
Published: Colegio de Postgraduados 1997
Online Access:https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1493
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spelling oai:ojs.pkp.sfu.ca:article14932020-05-14T05:54:03Z GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE ACIDO GIBERELICO, ACIDO CLOROETILFOSFONICO Y UREA EN LA FLORACION Y RENDIMIENTO DEL NARANJO ?VALENCIA? Curti-Díaz, Sergio A. Mosqueda-Vázquez, Raúl Rodríguez-Peña, Manuel A. Citrus sinensis L. floral induction orange growth regulators Citrus sinensis L. inducción floral naranjo reguladores del crecimiento A study was carried out on seven-year old ?Valencia? orange trees, growing in a clay loam soil to shift the harvesting period from January-March (normal) to May-August when fruit gets the highest price. GA3 25 mg L-1 was applied twice (December 12th and 26th, 1990) to reduce the late winter flowering. In addition, at 80 % of petal fall, CEPA 1000 mL L-1 + urea 2 % was sprayed to reduce fruit number (March, 1991). To stimulate summer flowering, CEPA 250 mL L-1 was applied in mid-April, when fruitlets diameter was 1.5 cm, together with low-biuret urea at the rate of 210 g N per tree divided in two applications: 60 g on April 23 and 150 g on May 29. These treatments were applied before the completion of natural soil moisture stress. In winter as a result of GA3 treatment, the number of flowers and shoots per m2 of canopy decreased in 24 and 28 %, respectively. CEPA + urea in a 2nd stage, got 95 % of fruitlets thinning and further stimulated vegetative flushes and blooming in April, at levels four to five times greater than in control trees. However, strong defoliation and even shoot tip burning was observed in treated trees. Summer flowering intensity was increased because of the GA3 applied on December as well as the urea sprayed on April and May, but only urea increased summer production. Neither thinning of fruitlets, in winter, nor applying CEPA alone in April were effective in increasing the size of the spring and/or summer harvest. Con el propósito de incrementar la producción de fruta en el periodo de mayo a agosto, cuando el precio llega a ser tres a seis veces mayor que el obtenido de enero a marzo, se efectuó un estudio en Papantla, Veracruz, de diciembre de 1990 a enero de 1992, en árboles de naranjo (Citrus sinensis L.) ?Valencia? de siete años de edad, establecidos en un suelo de textura migajón-arcillosa. Se evaluó el ácido giberélico (AG3) para reducir la intensidad de la floración de invierno, en una concentración de 25 mg L-1, aplicado en dos ocasiones (12 y 26 de diciembre); además, para ralear el fruto pequeño de la misma floración, se asperjó ácido cloroetilfosfónico (CEPA) con 1000 mL L-1 + urea 2 % cuando la caída de los pétalos era mayor de 80 %. Para estimular la floración de primavera y verano se aplicó CEPA a 250 mL L-1, cuando el fruto tenía un diámetro de 1.5 cm (15 de abril), con o sin urea de bajo contenido de biuret dividida en dos aplicaciones: 60 g/árbol el 23 de abril y 150 g/árbol el 29 de mayo, antes de que finalizara el periodo de sequía. El AG3 redujo el número de flores y brotes de invierno en 24 y 28 %, respectivamente. El CEPA + urea ralearon 95 % de los frutos pequeños, y posteriormente la emisión de brotes vegetativos y florales en abril se incrementaron en cuatro a cinco veces, con respecto a los árboles testigo; sin embargo, se observó una fuerte defoliación e inclusive quemaduras de puntas de brotes de los árboles tratados. La urea y el AG3 incrementaron la floración en julio, pero sólo la urea incrementó la producción de dicha floración. El raleo de frutos pequeños en invierno y el CEPA aplicado solo, en abril, no afectaron la intensidad de la floración de primavera o verano. Colegio de Postgraduados 1997-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo revisado por pares application/pdf https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1493 Agrociencia; Vol. 31 No. 3 (1997): 1997-jul-sep; 297-303 Agrociencia; Vol. 31 Núm. 3 (1997): 1997-jul-sep; 297-303 2521-9766 1405-3195 spa https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1493/1493
institution COLPOS
collection OJS
country México
countrycode MX
component Revista
access En linea
databasecode rev-agrociencia-mx
tag revista
region America del Norte
libraryname Departamento de documentación y biblioteca de COLPOS
language spa
format Digital
author Curti-Díaz, Sergio A.
Mosqueda-Vázquez, Raúl
Rodríguez-Peña, Manuel A.
spellingShingle Curti-Díaz, Sergio A.
Mosqueda-Vázquez, Raúl
Rodríguez-Peña, Manuel A.
GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE
author_facet Curti-Díaz, Sergio A.
Mosqueda-Vázquez, Raúl
Rodríguez-Peña, Manuel A.
author_sort Curti-Díaz, Sergio A.
title GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE
title_short GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE
title_full GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE
title_fullStr GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE
title_full_unstemmed GIBBERELLIC ACID, CEPA, AND UREA ON FLOWERING INDUCTION AND FRUIT YIELD OF ?VALENCIA? ORANGE
title_sort gibberellic acid, cepa, and urea on flowering induction and fruit yield of ?valencia? orange
description A study was carried out on seven-year old ?Valencia? orange trees, growing in a clay loam soil to shift the harvesting period from January-March (normal) to May-August when fruit gets the highest price. GA3 25 mg L-1 was applied twice (December 12th and 26th, 1990) to reduce the late winter flowering. In addition, at 80 % of petal fall, CEPA 1000 mL L-1 + urea 2 % was sprayed to reduce fruit number (March, 1991). To stimulate summer flowering, CEPA 250 mL L-1 was applied in mid-April, when fruitlets diameter was 1.5 cm, together with low-biuret urea at the rate of 210 g N per tree divided in two applications: 60 g on April 23 and 150 g on May 29. These treatments were applied before the completion of natural soil moisture stress. In winter as a result of GA3 treatment, the number of flowers and shoots per m2 of canopy decreased in 24 and 28 %, respectively. CEPA + urea in a 2nd stage, got 95 % of fruitlets thinning and further stimulated vegetative flushes and blooming in April, at levels four to five times greater than in control trees. However, strong defoliation and even shoot tip burning was observed in treated trees. Summer flowering intensity was increased because of the GA3 applied on December as well as the urea sprayed on April and May, but only urea increased summer production. Neither thinning of fruitlets, in winter, nor applying CEPA alone in April were effective in increasing the size of the spring and/or summer harvest.
publisher Colegio de Postgraduados
publishDate 1997
url https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1493
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