Strengthening soil, fertilizer and water management is the fundamental measure to improve tree nutrition. Therefore, it should be advocated to combine the application of base fertilizer (organic fertilizer) in autumn for deep tillage. At the same time, formula fertilization is advocated, and the ratio of nitrogen, phosphorus and potassium fertilizer is 2∶ 1∶2 in the early stage of fruit development; The late application of phosphorus and potassium fertilizer can effectively promote the formation of anthocyanins in pericarp and enhance the coloring of red varieties. If spraying 0. 15% potassium dihydrogen phosphate 1 ~ 2 times on the leaves during the full coloring period, the coloring degree of red pear can be obviously improved. At the early stage of fruit development, the orchard can maintain sufficient water; Soil moisture should be strictly controlled in the later stage, and the soil moisture in the coloring stage should be 60% ~ 70% of the maximum field capacity.

(2) plastic trimming

Through reasonable pruning, the coverage rate of branches and leaves of orchard population is less than 78.5%, and the light transmittance of canopy is 30%. Pruning pear trees in winter should be based on thinning, combining slowing, thinning and shrinking, controlling the number of backbone branches and crown height, widening the spacing between layers and maintaining sufficient row spacing. During the growth period, we should pick the heart and pull the branches at the right time, and remove the upright flourishing branches, dense shading branches and sprouting branches at the sawing mouth, so that the branches can see the light and the fruits can be bathed in the light, so as to meet the need of light for fruit coloring in the later period.

(3) improve lighting conditions

Increasing light can induce the formation of anthocyanins. It is usually solved by reasonable pruning, picking leaves and turning fruits, laying reflective films under trees, etc.

(1) Pick leaves. Remove shaded leaves and sticky leaves within 5 ~ 15 cm around the fruit 4 weeks before picking, but you can't pick too many leaves at once too early, and you can do it in stages, otherwise it will cause sunburn; Keep the petiole when picking leaves, and control the total amount of picking leaves within 20%.

(2) Lay a reflective film under the tree. During the coloring period of red pear fruit, silver plastic film was laid under the crown to increase the absorption of reflected light by the tree. This method has obvious effect on increasing the coloring of the inner cavity of the crown and the lower fruit, but attention should be paid to leveling the land, removing the dead branches and pebbles on the ground, cutting off the branches that are too low, and raising the fruit close to the ground to prevent shading and sunburn. In addition, it is necessary to keep the surface of the film clean and keep its strong reflective ability.

(4) flower thinning and fruit bagging

Flower thinning should be carried out in the inflorescence separation period, and fruit thinning should generally be carried out 25 ~ 30 days after flowering. Bagging can be carried out after fruit thinning, and it will be completed by the end of May at the latest. Picking bags should be carried out 30 ~ 35 days before picking, and double bags should be excluded first. When the fruit has stripes, the inner bag should be removed. It is best to pick your bags before 10 in the morning and after 4 pm in sunny days. Spray bactericide 2 ~ 3 days before picking the bag to prevent infection with germs.

(5) applying plant growth regulator

The results showed that spraying 1 ~ 2 times of 30 ~ 40 mg/kg NAA or PBO 30 ~ 40 days before fruit harvesting could not only prevent fruit from falling before fruit harvesting, but also improve the coloring rate and coloring area. Spraying ethephon 1000 mg/kg 40 days before harvest also has significant color enhancement effect. In addition, spraying 500 mg/kg rare earth or potassium dihydrogen phosphate is also helpful to fruit coloring. Another example is to spray 1 times 1 times1500-2000 times red enhancer every 10 day within 40 days before fruit picking. Not only can the sugar content be obviously increased, but also the pear can be colored in advance to improve the coloring index.

(6) Artificial coloring after harvest

The results showed that, after picking, the red fragrant crisp pears were stored in an environment with temperature 17 ~ 20℃ and air relative humidity above 85% or in a cool and ventilated place, covered with a layer of wet fine sand of 10 ~ 20 cm, and the fruits were neatly arranged on the fine sand, leaving gaps between the fruits, and cold water was sprayed on the surface of the fruits three times a day.