Effects of Naphthalene Acetic Acid and Carbaryl on Fruit Thinning in ‘Kinnow’ Mandarin Trees

الموضوعات :

Golnar Safaei-Nejad ¹ (Department of Horticultural Science, Collage of Agriculture, Shiraz University, Shiraz, Iran)
Ali-Reza Shahsavar ² (Department of Horticultural Science, Collage of Agriculture, Shiraz University, Shiraz, Iran)
Abbas Mirsoleimani ³ (Department of Horticultural Science, Collage of Agriculture and Natural Resources of Darab, Shiraz University, Shiraz, Iran)

تاريخ الإرسال : 19 الأربعاء , جمادى الثانية, 1436 تاريخ التأكيد : 20 الإثنين , صفر, 1440 تاريخ الإصدار : 14 الأربعاء , رمضان, 1436

الکلمات المفتاحية: Carbaryl Chemical thinner Citrus Fruit size Naphthalene acetic acid (NAA) Return bloom,

ملخص المقالة :

Several fruit trees including some cultivars of citrus tend to develop irregular bearing. Fruit thinning has been used for hundreds of years to manipulate blooming and crop load to improve the alternate bearing process. Frequently, combination sprays of two or more chemical thinners are used in various fruit trees and the thinning responses were additive and more effective than individual compounds. In this study, we investigated the effects of Naphthalene acetic acid and carbaryl alone and in combination in thinning of ‘Kinnow’ mandarin (Citrus reticulata Blanco) trees. Some characteristics such as fruit weight, diameter and volume, total soluble solid (TSS), titrable acidity (TA), TSS/TA, vitamin C and peel thickness were measured prior to harvest for 2010 and 2011 as a complete randomized block design with 13 treatments and four replications. Results showed that the application of NAA and carbaryl alone in June drop stage of fruit growth increased fruit thinning percentage, TSS of fruit juice, fruit weight, volume, diameter and length. These chemical thinners improved fruit size significantly by increasing the leaf/fruit ratio. Combination sprays could not effectively thin fruits than individual chemicals and thus had no effect on fruit size. Fruit characteristics such as TA, ascorbic acid, TSS/TA ratio and peel thickness were not affected by our treatments.     

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