Answer: oil pear tree is a kind of tropical subtropical evergreen fruit trees, flowers, slightly fragrant, with nectar, is a kind of nectar plant. Strong adaptability, medium yield, no obvious large and small annual phenomenon. It has a beautiful tree shape and is also an ideal greening tree species. China's southern Guangdong, Fujian, Taiwan and other provinces are cultivated.

Oil pear belongs to perennial evergreen tree, grafted trees in the second to third year after the value of the second to third year began to bear fruit, the fifth year can produce 10 to 20 kg, 10 years into the fruitful period.

The fertilizer consumption of avocado is large, either young trees or fruit trees, should be based on soil fertility, tree age and plant growth and development, yield status to decide the amount and proportion of fertilizer.

Fixed value after the young orchard legume cover crop, seedling base cover grass, to take dead, live cover combination, control weed overgrowth, reduce soil erosion, fertilization of the ground.

Research has proved that the first year after fixing the value of every 1 to 2 months need to apply mixed fertilizer 1 time, nitrogen: phosphorus: potassium: magnesium = 1:1:1:0.33, the application amount from 110 grams per plant gradually increased to 450 grams. Adult trees at 150 to 225 kg per hectare per year mixed fertilizer, applied in 3 to 4 times, nitrogen: phosphorus: potassium: magnesium = 1:0.4:1.2:0.4. The United States of America with the State of California, mature and healthy, not pumping new non-fruiting branches of the peak of the leaves were analyzed, and set out to the nutritional abundance and lack of indicators of the oil pear tree (Table 9-14).

Table 9-14 oil pear mature tree leaf nutrient diagnostic index

China in the fixed value, young orchard fertilization, to thin fertilizer diligently apply the principle of liquid nitrogen fertilizer. Every year in the application of sufficient organic fertilizer and phosphorus and potassium fertilizer on the basis of the growing period in May to August, once a month after the application of liquid nitrogen fertilizer. Fertilization of fruiting trees should be based on nitrogen and potassium, 3 to 4 times a year, respectively in February to April, April to May and July to September. Phosphorus fertilizer and organic fertilizer mixed in the fruit before and after several times. Avoid injuring the roots of oil pear, to spread fertilizer, shallow ditch or water with watering is appropriate.