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Tag: Citrus Flowering

29 Sep 2022
Citrus Flowering
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Gibberellic acid in Citrus spp. flowering and fruiting: A systematic review

In Citrus spp., gibberellic acid (GA) has been proposed to improve different processes related to crop cycle and yield. Accordingly, many studies have been published about how GA affects flowering and fruiting. Nevertheless, some such evidence is contradictory and the use of GA applications by farmers are still confusing and lack the expected results.

This review aims to collate, present, analyze and synthesize the most relevant empirical evidence to answer the following questions: (i) how does gibberellic acid act on flowering and fruiting of citrus trees?; (ii) why is all this knowledge sometimes not correctly used by farmers to solve yield problems relating to flowering and fruit set?

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28 Sep 2021
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Effect of Different Day Temperatures on Flowering and Fruiting in Tosa Buntan Pummelo (Citrus grandis (L.) Osbeck)

The effect of different day temperatures during winter and spring seasons on the flowering and fruiting of 3-year-old potted Tosa Buntan pummelo (Citrus grandis (L.) Osbeck) trees grafted on trifoliate orange (Poncirus trifoliata Raf.) rootstock was investigated. The experiment was conducted in growth chambers with setting day temperatures of 15℃, 20℃, 25℃, 30℃ and 35℃, while night temperature in each chamber was set at a constant 10℃. The temperature treatments were started on December 18, 1989 and terminated on May 1, 1990, except for the 15℃ day temperature treatment which lasted until June 11, 1990. After the temperature treatments in the growth chambers, all trees were grown in the same way in the field condition until harvesting time of November 15, 1990. The lowest day temperature treatment of 15℃ needed considerably more days to flower bud initiation and greatly inhibited flower bud development, thus all flower buds in this regime dropped before and after their opening.

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29 Jun 2021
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Manipulation of citrus flowering and fruiting by pruning

Selective pruning of citrus trees is needed to manipulate the partitioning of carbohydrates between various tree parts. In well-managed citrus orchards proper pruning practices will likely have the most significant impact on optimizing yield and fruit size. Inferior flowering wood is removed at specific phenological stages (as soon as possible after harvest in winter or as early in spring as possible). Smaller heading-back and thinning cuts are made throughout the canopy to weaken the trees’ regrowth vigor and to open trees to light, in an attempt to balance fruiting and regrowth.

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