I dont know what to do

Hi ! ch.mouloud586 Greetings from India!!! Orange rinds split open seasonally and is primarily the result of inappropriate plant care, also temperature fluctuations and humidity. The size of a split varies. It may be slim and short or expose the pulp inside the fruit. Naval orange is most prone to this problem. Fruit split open more, likely because of the thickness of the rind and the large stylar, or navel. The green fruit is usually the splitting citrus fruit. Oranges splitting, or any other citrus fruit, are a result of faulty cultural activities. Irrigation problems may contribute where the tree gets too much water. In winter, the tree only needs 1/8 to 1/4 inch of rain per week. In March to June, this increases to ½ inch and during the warm season, the tree requires 1 inch of water per week. Over fertilizing will also cause the problem. The nutrient needs of oranges should be 1 to 2 pounds of nitrogen annually. You should break up the application into three or four periods. This will prevent too much food, which will make orange rinds split open and possibly crack. Tree stress is thought to be another cause of splitting citrus fruit. Hot, dry winds desiccate the tree and dry the plant. Then it takes moisture from the fruit, which shrivel. As soon as water is available, it goes to the fruit, which then swell too much. Young plants with small root systems are most susceptible because they do not have a wide enough root area in which to gather moisture. Please check the aforesaid reasons and take remedial measures your problem will be resolved. Thanks for visiting Plantix community

Great diagnosis Juliane - Fitocon | ManejeBem However, there are some other factors also

Calcium Deficiency . kindly refer plantix library for more information and description of the problem and management. click on blue link to access the library. Thanks

Thanks Vinay Kumar Ji for your upvote

Carence en Calcium

Thanks Vipul Gowda Ji for upvote

Great effort satyavathi430 for your upvote

need boron

fruit

It is due to either Boron Deficiency or Calcium Deficiency .

pl go through my comments

Hi Welcome to Plantix community. Your "Cotton Plant" is effected by Boron Deficiency or Calcium Deficiency For more details and control measures, contact Plantrix library by clicking on blue hyper link given above. Thank you, visit again.

Lemon tree 2 ,years no grafting

إنتظام الماء

this may occur due to inapropriate management of water and also calcuim deficiency is clearly visible.

Hicham Ouach Please go through my comments

Potassium dificiency