Unique guava greenhouse cultivation

1, species selection. In the northern greenhouse, the current large planting area, good yield and quality performance of the variety is "pearl", the species grows rapidly, the planting can be fruiting in the year, high yield, easy cultivation and management, disease resistance, fruit flavor, well received by People love it.

2, planting conditions. It is suitable for the cultivation of sandy soil with deep soil, medium fertility, and good drainage. The height of most northern solar greenhouses can meet the requirements for guava cultivation.

3, cultivation techniques.

(1) Planting density before transplanting is 2 meters between rows and 3 meters apart. Dig holes, 60 cm deep and 80-100 cm in diameter. Mix the excavated soil with organic fertilizer in a ratio of 9:1 and fill it back into the hole. The backfill is 20 cm above the ground.

(2) Suitable seedling transplanting time is from mid-late April to mid-June. Before transplanting seedlings, 800-1000 times thiophanate-methyl should be used to dip the roots for 10 minutes. The seedlings should be dehydrated too much and must be soaked in water for 6-8 hours before planting. When transplanting, the seedlings are placed in the planting hole, and the soil is filled with the seedlings with compaction. The depth of the buried soil is better to maintain the original soil mark. After planting, make a tree plate around the size of the crown and pour the root water.

(3) Management of water and fertilizers 1-2 years old Each year, 3 kg of organic fertilizer is applied after heavy shearing. Nitrogen, phosphorus and potassium fertilizers are applied after each pruning. The annual N, P, and K contents are 100-150 g/plant; 3-4 years. The age of organic fertilizer applied was 5 kg. The annual amount of N, P, and K was 200-300 g/plant, and the amount of N, P, and K was 4-5 kg ​​per year. The annual N, P, and K contents were 400-500 g/plant. At the same time pay attention to the application of trace elements such as iron and zinc. Irrigation is based on keeping the soil moist. In the fall and winter season, irrigation is usually conducted 10-15 days.

(4) After the pruning and planting, the seedling height is cut by 50-60 cm, and the new shoots are promoted. The 3 to 4 oblique branching branches with proper distribution and suitable branching angle are selected as the main branch. When the main branch grows to 30-40 centimeters, it will be short, the branches will be promoted, and 2-3 branches will be selected as the deputy main branch. Then, the resulting branches will be cultured on the main branch and vice main branch. The young trees are generally pruned with light shearing, topping, and tipping. After entering the full fruit period, the pruning is increased, the new shoots are promoted, and large branches and main branches are short-cut in time. As the result area is increased and shifted outward, the tree vigor declines, and the plant with many years of results must be updated in time.

(5) Flowering and fruiting management The sparse flowering is generally carried out from late May to late June. The single flower inflorescence is preserved, the two flower clusters remove one flower, the three flower clusters remove the left and right flowers, and retain the central flower. Sessile flowers; fruit thinning in young fruit for about 35 days, strong branches left 2 fruit per branch, leaving a fruit branchlets, and remove deformed fruit and pests and fruits. When the fruit develops to a diameter of 2-3 cm, the bag is bagged, and the 1-2 doses of the disease-preventing agent are sprayed before the bagging.

(6) The optimum growth temperature of greenhouse guava is 23-35 °C, the temperature of tree tolerant is 0 °C, and the minimum temperature of fruit ripening is 15 °C. If you retain the fruits of winter and spring seasons, you need to warm up to ensure that the minimum temperature is above 15 °C, and reduce the humidity in the greenhouse through the size of the tuyere.

(7) Pest control The guava plant in the northern greenhouse has fewer diseases, and the insects are mainly wired worms, which can be diluted with dichloroisopropyl ether, diisothione, or phenylephrine before being irrigated.