The phenomenon of citrus large and small annual results generally exists in various production areas, causing large fluctuations in yield, reduced fruit quality, poor fruit uniformity, small fruit, sour taste, rough oil cells, thickened peel, and increased deformed fruit.

In high-yielding years, the price of citrus fell and the market fell, which resulted in a bumper harvest. In the small years, there is no price and no goods. Even if there is fruit, the quality is difficult to guarantee and the price cannot be sold, which seriously affects the economic income of fruit farmers.

What causes citrus years

Citrus is a perennial fruit tree with a long fruiting period and flower bud differentiation while the fruit develops. Therefore, in the citrus planting process, factors such as the influence of external environmental conditions and improper management techniques often cause citrus trees to grow in size.

Climatic anomalies

Due to the climate not adapting to the growth and development of citrus, there is a wide range of production reductions, often in one or several provinces and regions, and the most important ones involve the whole country.

Freezing damage: The severe freezing damage is characterized by a large reduction and a wide range of tree damage. It is the number one killer leading to young age.

Water damage: It mainly occurs in low-lying areas. The roots are damaged and the yield is reduced, and the plants are severed.

Heat damage: If the temperature is too high during the flowering and young fruiting periods, it will cause heat damage and produce a large number of fruit drops.

Insufficient light: If there is insufficient light in the long-term low temperature and rain in February to April, it will easily cause poor flower development and cause a large number of flowers and fruits. Even high-yielding trees will become low-yield.

Improper cultivation

Yield is too high: the lack of production control technology in high-yielding years leads to excessive nutrient consumption, insufficient nutrient sticks, and reduced production in the following year. This is a common cause of large and small years.

The overall level of nutrition is low: due to the small amount of fertilization, the nutrition of the tree is insufficient for shoot development and flower and fruit development, leading to reduced yield.

Nutritional imbalance: Any nutrient element that needs artificial supplementation, the deficiency of any one element will lead to reduced production.

Pest and disease damage: When a certain kind of pest and disease reaches economic yield loss, it will lead to different degrees of yield reduction.

Fertilization: When too much fertilizer is applied, the soil solution concentration is higher than the tree solution concentration, which will lead to fertilizer damage and reduce yield.

Poisoning: Improper selection of medicine or high concentration of medicine will damage the tree body and reduce production.

Improper rootstock: Large and small years due to incompatibility of the rootstock combination.

Due to the above situation, after the formation of a small year, there will be less results, too much nutrient accumulation will cause excessive flower bud formation, and the leap year will easily form a large year, thus falling into a vicious cycle of large years and small years alternating.

Ways to Reduce Citrus Size Years

To overcome the big and small results, the most effective method is to ensure adequate nutrition, cultivate a robust tree body, and maintain a balanced tree vegetative and reproductive growth.

1. Judgment

Under normal circumstances, the size of the orange leaf area index after winter is the most effective way to judge the size of the year. The effective time is judged to be after the temperature rises steadily and before flowering. Within a certain range, the larger the LAI, the higher the yield.

(Leaf area index = sum of crown leaf area / floor area)

● It can be judged that the leaf area average index is greater than 3.5.

● Judging that the leaf area average index is less than 3 is a small year.

● For trees with an average leaf area index lower than 2, it is difficult to obtain ideal results even if the fruit is preserved. You should abandon the fruit preservation, strengthen management, restore tree vigor, and ensure a good harvest the following year.

2.Fruit

Fruits are retained according to tree vigor and fruit-to-leaf ratio. Generally according to the ratio of leaves and fruits: granulated orange 20: 1, medium-fruited varieties (Gonggan, etc.) 30-40: 1, large-fruited varieties (Wogan, Maogugan, etc.) 40-50: 1, navel orange 60: 1.

Fruits are preserved in young years, and flowers and fruits are sparse in old years. Young fruits are sparse in time, small fruits, weak fruits, deformed fruits, partially dense fruits, scientific fruit retention.

3.Fertilize

Reasonably supplement the nutrition required by the plant according to the amount of fruit hanging, pay attention to the types of fertilizers, and the reasonable combination of organic and inorganic. In particular, pay attention to the input of organic fertilizers and the reasonable use of chemical fertilizers. At the same time, a large number of elements must be supplemented with medium and trace elements.

● The annual fruit tree must be fully fertilized three times before flowering, strong fruit, and post-harvest. In addition to fruit harvesting, it can be applied in combination with sea elf biostimulants to improve the rhizosphere environment and promote nutrition absorption.

● In addition to the above, the young tree fruit tree should also pay attention to increasing the use of phosphorus and potassium fertilizer. It can spray 500-800 times the source and reservoir of phosphorus and potassium at the critical growth stage to promote strong branches, enhance photosynthesis, and improve quality. .

4.Pruning

● Because the fruit of the year is more fruit-bearing, the nutrient is consumed more, the tree vigor becomes weak, and the summer and autumn shoots have less hair loss. It should be lightly cut, mainly thinning, thinning dead branches, disease and insect branches, retaining thin branches and inner branches. , Maintain ventilation and light, improve the quality of flower buds and fruit set in the middle.

● The young fruit tree has fewer fruits and more nutrient accumulation. It has more summer and autumn shoots. The tree is strong. Pruning should be heavy, thinning, shrinking, and truncating. Thin thin branches and weak crosses should be thinned. Cultivate a natural happy and robust crown. .

5, breeding results

Fruiting trees breed robust fruiting mother branches that can reduce and overcome large and small annual fruiting. Autumn shoots are usually used as excellent fruiting female branches.

● Fruiting trees in the new year Try to choose late summer or early autumn shoots as the fruiting branches of the coming year, which is conducive to flowering and bearing in the coming year.

● Young fruiting trees Due to the strong vegetative growth, it is better not to put autumn shoots later than early.

6.Other management

For frost damage, water damage, heat damage, drug damage, fertilizer damage, pests and diseases, we must do a good job of prevention, and once it occurs, we must make timely remedial work according to the characteristics of the cause.

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