How to fertilize oranges?

How to fertilize oranges? How do you know that oranges are short of fertilizer? Also ask experienced netizens to help introduce the citrus fertilization requirements to timely supplement the required nitrogen, phosphorus, potassium and other nutrients, maintain a certain tree potential, ensure the normal growth and development of the tree, and achieve the goal of high quality and stable yield year after year. Therefore, the farming network sorted out the various symptoms of citrus fertilizer deficiency, which are listed in detail below for netizens' reference. Symptoms of nitrogen deficiency in citrus: when nitrogen fertilizer was insufficient, the sugar content increased with the increase of nitrogen application rate, but the sugar content decreased when too much nitrogen fertilizer was applied. The acid content is opposite to the sugar content, and if the nitrogen fertilizer is excessive, the acidity is high. In the orange orchards cultivated continuously in the past, if the amount of fertilizer application is reduced, most of them show better coloring, smooth pericarp, decreased acidity and improved quality. however, continuous weight loss and insufficient nutrition of orange trees will lead to the decline of tree potential and yield. Fruit and quality decline in large and small years. Floating skin is usually the more nitrogen fertilizer occurs. For the coloring of pericarp, when the amount of nitrogen application is insufficient, the color changes quickly, but the color is light; if the amount is excessive, the color is thick, but some green remains. Symptoms of phosphorus deficiency in citrus: phosphorus has a good effect on flower bud differentiation, fruit quality, especially acid reduction of citrus. Under the condition of phosphorus deficiency, the growth and development of orange trees were poor, and the quality of orange trees decreased. Therefore, the application of phosphorus deficiency can improve the fruit quality. When there is no lack of phosphate fertilizer, the application of phosphate fertilizer can hardly increase the content of phosphoric acid in the tree, and it is difficult to see the promoting effect on the growth and development of citrus and fruit quality. If there is too much phosphorus, it will hinder the growth of fine roots, reduce the absorption of nitrogen, and cause the lack of trace elements such as copper and zinc. Symptoms of potassium deficiency in citrus: potassium-deficient citrus peel is thin and smooth, low acidity, small fruit, low yield. If the application of potassium is increased, the fruit will become larger and the yield will increase, but when there is too much, the fruit will be coarse-skinned and the quality is poor. Symptoms of trace element deficiency in citrus: zinc, magnesium, manganese and other trace elements deficiency or excess symptoms can be shown in fruits and leaves, and affect the growth and development of orange trees, quality decline, according to the deficiency symptoms can be applied once a year. The effect of organic fertilizer on citrus: organic fertilizer is applied in autumn as the main period, such as the application period is delayed to the beginning of spring, nitrogen fertilizer is released one after another, and if there is a large amount of excess nitrogen fertilizer in the fruit expansion period, the growth of new shoots can not stop, and the fruit quality will decline. What is the control method of anthracnose in citrus seedlings