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Fertilization of the first fruit of sweet orange
The principle of fertilization for fruit trees (4 to 5 years) for sweet oranges is to re-apply in the winter, before spring and before autumn, and not before summer. 1. Precipitating Fertilizer: Under the application of 10-15 days before the spring buds, mainly available N and P fertilizers, each 0.2 kg urea plus 0.2 kg compound fertilizer. If the tree is more prosperous, it can reduce the amount of fertilizer. 2. Xie Hua Fei: To the tree, to see the amount of flowers to apply, weak trees, flowers can be a small amount of application of available nitrogen fertilizer, 0.2 kg per urea; if the tree is strong, flowers can not be applied, so as not to cause falling flowers and fruit. 3. The fruit-promoting tip fertilizer: Autumn shoots are extracted 10 to 15 days before the application, the purpose is to speed up fruit enlargement at the same time, promote the autumn shoots neat and robust. This time it is best to use decomposed human excrement or decomposed peanut bran. Each 0.5 to 1 kg of cake fertilizer or urea 0.2 kg, 10 kg of human and animal manure. 4. Harvesting fruit fertilizer: The purpose is to restore the tree vigor, generally after fruit picking, and some before the fruit is applied into the available nitrogen. 5. Overwintering fertilizer: combined with cultivating farmer's fertilizers as a base fertilizer for the whole year. Different fertilizers have different varieties and different cultivation areas have slight differences. Generally, the ratio of nitrogen, phosphorus and potassium is 1:0.7:0.6.