Causes and control methods of navel orange fruit cracking

Navel orange fruit cracking is a phenomenon in the process of navel orange planting, which mainly occurs in the fruit expansion period. Fruit cracking will affect the shape of navel orange, seriously affect the yield, and is directly related to the income of fruit growers. So what is the reason for the cracking of navel orange? Let's take a look.

First, the cause of fruit cracking

1. Climatic reasons

In the period of high temperature in summer and autumn, the pericarp tissue and cells of the fruit will be damaged by strong sun exposure. at this time, if the soil is rained or irrigated, it will make the fruit expand rapidly, split the pericarp and crack the fruit.

2. The pericarp is thin

Similar to the climate of long drought and rain, when the fruit is close to maturity, the pericarp will become thinner and softer, with the increase of sugar in the pulp, the fruit will absorb water and expand rapidly, and the fruit will crack.

3. Improper fertilizer and water

When fertilizing, if there is too much phosphate fertilizer or too much soil moisture, it will lead to fruit cracking of navel orange.

4. Variety nutrition

There are many varieties of navel orange, and the characteristics of different varieties are different. some varieties blossom more but the phenomenon of fruit cracking is more serious; the varieties with single flower leaves are easy to crack; the varieties with high proportion of leafless flowers are easy to crack; the varieties with flat fruit type are easy to crack fruit, while the long type fruit is not easy to crack fruit; the varieties with thinner peel are easy to crack fruit.

II. Prevention and control measures

1. Select improved varieties

When planting, choose varieties with small navel or closed navel, thick pericarp and fruit-shaped plateau, which can reduce the phenomenon of fruit cracking.

2. Strengthen the management of fertilizer and water

Increase the application of organic fertilizer to enhance the tree potential, in the period of fruit development, increase the application of potassium fertilizer as a strong fruit fertilizer, make the fruit tissue grow healthily, spray nutrient solution containing nitrogen, phosphorus, potassium, calcium and other elements during navel orange fruit cracking, and then do a good job of drainage and irrigation measures. Timely watering during drought, but should not flood irrigation, rainy season should be timely drainage.

3. Thinning flowers and fruits

In the flowering and fruiting stage, leafless flowers, leafy single fruits and flat fruits are first removed, and then gibberellin is smeared with gibberellin in summer. Bagging technique can also be used to prevent fruit cracking.

The above is the introduction of the causes and prevention methods of navel orange cracking. I hope it can help you. If you want to know more about it, please follow us.