Papaya is a kind of arboreal plant, with a plant height of 5- 10 m, oval leaves, pink flowers, dark yellow fruits and a certain aroma, and it ripens in September-10. This kind of fruit itself likes light, is not tolerant of shade, and is suitable for growing in sheltered and sunny places. It is not only an ornamental plant, but also its fruit has edible value and is rich in various nutrients.

Papaya is a small tree with cylindrical branchlets and purplish red color. It is hairy when it first grows out, and then it will slowly fall off. Its flowers are usually solitary, 2.5-3 cm in diameter, bell-shaped calyx tube, lanceolate sepals and pale pink petals. The fruit is rectangular with a dark yellow surface and a certain aroma.

Protection of Papaya in Northern China;

The key points of maintenance in northern papaya tree are illumination, fertilization, watering and pruning. Receive more sunlight every day during breeding to promote flowering and fruiting. Organic liquid fertilizer is applied every half month in the growth period, and phosphate fertilizer and potash fertilizer are the main ones in the bud period. Water every 4-5 days to keep the soil slightly wet. Pruning and leaf cutting at seedling stage and growing stage.

1. The growth of papaya trees in the north is inseparable from light conservation. Receive more sunlight in daily farming, which will promote photosynthesis, such as healthy growth of branches and leaves and better flowering and fruiting. When the light is strong, shade it properly, such as building a shed.

2. The growth of papaya trees in the north needs regular fertilization, such as applying organic liquid fertilizer every two months during the growth period to promote rapid maturity. Phosphate fertilizer and potassium fertilizer are mainly used in bud stage to reduce the use of nitrogen fertilizer. It is suitable to apply phosphorus, potassium and nitrogen ternary compound fertilizer before flowering, and phosphorus and potassium fertilizer are the main ones after flowering, supplemented by nitrogen fertilizer.

3. papaya tree, cultivated in the north, needs to be watered regularly during the growing period and the flower and fruit period, once every 4-5 days, and the amount of water should be kept slightly moist. Remember not to accumulate water. Reduce watering in winter and keep the soil slightly wet. Note that the water temperature is similar to the soil temperature.

4. Planting papaya trees in the north needs pruning. At seedling stage, you can pick the core, wipe the bud and pull the branches to promote the differentiation of flower buds, and prune the long branches, dense branches and invalid branches. Spraying plant growth retardants on leaves for 2-3 times during the growth period will promote the growth of branches to be stronger.