Dressing and shaping

Pruning and shaping, dwarfing the crown, cutting off the seedlings when they are 50-60 cm high after planting to promote new shoots.

Select 3-4 oblique branches with uniform distribution and suitable branching angle as main branches, cut the main branches by 30-40 cm, branch, and select 2-3 branches as auxiliary main branches.

Then the bearing branches are cultivated on the main branches and auxiliary main branches.

This can form a round crown with short trunk and many main branches, short tree shape and many effective branches.

Fertilizer and water management

The quality of guava fruit is closely related to fertilization, and the taste of fruit with organic fertilizer is obviously different from that with chemical fertilizer.

Therefore, it is necessary to use organic fertilizer and chemical fertilizer reasonably.

In 1 year, 2 kg of ternary compound fertilizer (the contents of nitrogen, phosphorus and potassium are all 15%), 0.2 kg of soybean bran 1 kg (or equivalent organic fertilizers such as chicken manure and pig manure), 0.2 kg of potassium sulfate and 0.5 kg of shell ash are applied to each plant;

In the second year of planting, the amount of fertilizer applied in the previous year increased by 1 times;

In the third year of planting, the amount of fertilization does not increase, but it can also increase according to the tree potential and yield.

(1) young tree fertilization

Topdressing is based on the principle of diligent fertilization and thin fertilization. Generally, new shoots are fertilized twice every 65,438+0 times of culture, and fertilized 65,438+0 times when new shoots germinate and when new shoots grow to 40 cm, with available nitrogen as the main fertilizer. 2.5-5.0 kilograms of decomposed manure or bran water and 0.3% urea liquid fertilizer, or 25 grams of urea and 50 grams of potassium fertilizer are applied to each plant.

(2) Fertilizing fruit trees

① Fertilizer for promoting shoots and flowers: after each shoot cutting to promote flowers, apply ternary compound fertilizer (the contents of nitrogen, phosphorus and potassium are all 15%), accounting for 30% of the annual fertilization, and lime powder1kg;

② Applying ternary compound fertilizer and potassium sulfate during the fruit growing period, accounting for 30% of the annual fertilization;

③ Before fruit picking, decomposed livestock manure, farmyard manure or peanut bran should be applied, accounting for 40% of the annual fertilization, and chemical fertilizer should be stopped at this time;

④ foliar fertilizer should be sprayed with 0.5% magnesium sulfate, 0. 1% boric acid or 0.2% borax solution at intervals of 7- 10 days, or topdressing outside the roots according to the lack of nutrients.

Pay attention to drainage in rainy season and irrigation in dry season. In winter, deep ditches in orchards store shallow water. After winter, the frame can be covered with plastic film to keep warm and moisturize.

Fruit period management

Pearl guava has many flowers and many fruits. In order to improve the quality of fruits, it is necessary to thin flowers and fruits during the flowering and fruiting period, remove heavy flowers, three flowers and stunted flowers in time, keep strong single flowers, and properly thin fruits, generally leaving 1 ~ 3 fruits per branch.

When the fruit grows to a diameter of about 3 cm, it is sprayed with pesticides and fungicides once and bagged. The inner layer of the fruit protection bag is a white foam net bag and the outer layer is a transparent plastic film bag.

Put the fruit in the bag, leave the leaves outside, tie the bag mouth tightly, and leave two small holes at the bottom of the bag, which is beneficial to ventilation and drainage.

Bagging can reduce pests and diseases, reduce pesticide residues in fruits and improve fruit quality and appearance.

In Zhuhai, the fruits harvested from June to August in Pearl Guava are light in flavor and poor in quality.

The price is lower, less than half that of autumn and winter fruits (10 ~ March of the following year).

After the fruit is set, pick the top 3 ~ 4 nodes of the fruit to make the top sprout new buds again, so as to prepare for the re-flowering and fruiting.

Pruning is carried out around June, and dense branches, thin branches and aging branches are cut off, leaving well-developed and full-grown branches.

At the same time, supplement fertilizer, water and control pests and diseases. To promote buds and flowers.

After this treatment, a batch of flowers can usually bloom in Zhuhai from August to September, and fruits can be received after 10 months.