Uso de reguladores de crescimento para incrementar la productividad de mandarino 'clemenules'

Abstract

RESUMEN -La finalidad de este trabajo fue evaluar el efecto del Quinmerac, comparativamente con 2, 4-D y nitrato de potasio, en la productividad de mandarino 'Clemenules´ (Citrus reticulata Blanco), a través del incremento del porcentaje de frutos con mayor tamaño (destino a mercado fresco), y a la vez determinar posibles efectos indeseables sobre la calidad de los frutos y presencia de fitotoxicidad por dos años sucesivos de aplicaciones sobre las mismas plantas. Durante las campañas 1998/99 y 1999/00, se trabajó en dos lotes de mandarino 'Clemenules´ de siete años de implantados, injertados sobre trifolio (Poncirus trifoliata Raf.) uno y sobre citrange 'Troyer´ (P. trifoliata x Citrus sinensis Osbeck) el otro, en Mburucuyá, Corrientes, en un suelo Psammacuent típico. Los tratamientos utilizados fueron: testigo sin aplicación; Quinmerac (10%), 10 mg. (1999/2000). Los productos se asperjaron foliarmente, con volumen de solución de 2,5 L.planta -1 . Quincenalmente se observaban las plantas en ensayo para detectar síntomas de fitotoxicidad. En la cosecha, se determinó la producción de frutos, clasificada en dos categorías por tamaño; la calidad externa por el aspecto de la corteza e interna mediante porcentaje de jugo, grados Brix, acidez y ratio. Los tratamientos con Quinmerac y nitrato de potasio incrementaron entre un 10 y un 15% la proporción de frutos con tamaño adecuado para mercado fresco. No se detectaron efectos en la producción total, disminución de la calidad de los frutos, ni fitotoxicidad. Términos para indexación: Quinmerac, 2,4-D, nitrato de potasio, Citrus reticulata. USE OF GROWTH REGULATORS TO INCREASE THE PRODUCTIVITY OF 'CLEMENULES´ TANGERINESABSTRACT -The purpose of this work was to evaluate the effect of Quinmerac, comparatively with 2, 4-D and potassium nitrate, in the productivity of 'Clemenules´ tangerines (Citrus reticulata Blanco), through the increase of the percentage of fruits with larger size for the fresh market, and also to determine possible undesirable effects on the fruits quality and presence of fitotoxicity by two successive years of applications on the same trees. During 1998/99 and 1999/00, the experiments were carried out in two plots of 'Clemenules´ tangerines of seven years old of implanted, budded on trifoliate orange (Poncirus trifoliata Raf.) one, and on the second one citrange 'Troyer´ (P. trifoliata x Citrus sinensis Osbeck), in Mburucuyá, Corrientes, in a typical Psammacuent soil. The treatments used were: control without application; Quinmerac (10%), 10 mg.L (1998/99) and potassium nitrate (14%N, 39% K), 2.5 g.L -1 (1999/2000). The products were sprayed on the trees, with a volume of 2.5 L.tree -1 . Biweekly the plants were observed to detect fitotoxicity symptoms. At the harvest time, the yield was determined, and the fruits classified by size in two categories; the external rind quality by its aspect and the internal quality by the juice percentage, Brix degrees, acidity and ratio. The treatments with Quinmerac and potassium nitrate increased between 10 and 15% ...

Maturation of early-ripening mandarin as affected by scion and rootstock cultivars in western Santa Catarina, Brazil

“…So, it is supposed that, among the scion cultivars tested here, 'Clemenules' juice would be well accepted by the consumer. The values observed in this work for SS and RI with 'Clemenules' agree with observations from Corrientes, Argentina, and Rosário do Sul, Brazil (Malgarim et al, 2007;Rodriguez et al, 2007).…”

Development of a Photoinduced Chemiluminescent Method for the Determination of the Herbicide Quinmerac in Water

“…However, quinmerac has also been found to promote cellular division and expansion, allowing an increase of the proportion of fruits of adequate size for the fresh market. 1,2…”