Causes of fruit cracking of sugar orange and its control methods

Sand sugar orange is an excellent variety of citrus, in all citrus varieties, its sugar content is very high, deeply loved by people, so there are more people planting. But the fruit will crack when the fruit is about to ripen, so why does the sugar orange crack the fruit? What should I do with the cracking fruit? Let's take a look.

First, the reason for the cracking of sugar orange.

1. Variety difference

In the same orchard, the fruit cracking situation of different varieties is also different, the thickness of the skin is uneven, especially the varieties with thinner skin at the top of the fruit are the most likely to crack, so we must pay attention to the selection of varieties.

2. Drought

The main cause of prolonged drought and sudden rain or irrigation is that in the expansion period of sugar orange, if the fruit skin shrinks, the pulp absorbs water quickly, the pericarp growth is not complete, and the growth rate is not as fast as that of the pulp, resulting in the pericarp being directly expanded by the pulp. Mechanical fruit cracking occurs.

3. Influence of soil moisture.

If the long-term Rain Water weather, soil water content is often in a state of saturation, causing new roots to suffocate to death, in a sudden stop rain with fruit cracking, early soil water will aggravate the occurrence of fruit cracking.

II. Prevention and control methods

1. Keep the soil moisture properly.

In order to maintain a high and moderate water content in the soil, so that the water supply of oranges will not change dramatically, water should be watered in time during drought. Generally, if there is no rainfall in half a month, it should be watered once to resist drought. In the high temperature and drought season, it is required to be irrigated every 10 days. Lay straw on the tree plate to avoid water evaporation. When there is waterlogging, ditches should be opened in time for drainage, and shallow ploughing should be done in time after heavy rain, so as to avoid anoxia and asphyxiation of roots.

2. Increase the application of phosphorus and potassium fertilizer

From July to August, each plant was treated with rotten human and animal dung water 50ml 70kg, urea 0.3kg and potassium chloride 0.2kg. After fertilization, the soil was covered and irrigated. For the plants that set too much fruit, nitrogen fertilizer should be applied in time to increase the thickness of the pericarp, and different varieties of foliar fertilizer should be sprayed every 7-10 days during drought, which can not only reduce fruit cracking, but also promote fruit expansion.

3. Balanced growth of peel and pulp

During the expansion period of sugar orange, there is no rain for a long time, and Guoguang must be used for comprehensive control. The middle and lower part of the crown which is easy to crack fruit is the key part of spraying liquid, spraying once a week, three times in a row, and once before the heavy rain, the control effect is better.

4. Remove it in time

The fruits that have been cracked should be removed in time so as not to continue to digest plant nutrients and water and at the same time reduce the breeding places of germs.

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