How much fertilizer does it take to plant 100 Lagerstroemia indica trees with a diameter of 5 cm per mu every year?

Chicken manure is the best organic fertilizer before winter, followed by pigeon manure, and then sheep manure, and 10 kg per tree is enough; Nitrogen fertilizer (urea is the best) should be applied about one week before the seedlings germinate in spring, usually in March, April, May, June and 1 month. Three centimeters of seedlings are enough, and five centimeters of seedlings are 2-3 Liang (soaked in soil or combined with watering after rain); At the end of July and the beginning of August, use compound fertilizer, apply it at the point, one plant is half a catty.

In addition, it depends on the soil conditions. Sand is not fertile, so use less. Generally, the above fertilization methods are enough. Clay and urea can be applied more at one time and less twice.