Guava is native to the tropical rain forest of South America, and likes high temperature and high humidity environment, and is not cold-resistant. Guava is one of the ancient fruit varieties in southern Fujian, but it is rarely cultivated on a large scale. Guava is rich in vitamins and is an auxiliary diet fruit for diabetic patients. In particular, new varieties were introduced from Taiwan Province Province, and the new technology of adjusting production cycle was applied, so that guava could be supplied with fresh fruit all year round, especially in winter and spring, and become a new seasonal fruit. The main points of cultivation and the technology of adjusting production cycle are briefly described as follows:

First, build a garden.

Guava is a shallow-rooted crop with shallow root distribution and fast growth. Plant in the same year and bear fruit in the same year. Therefore, paddy fields, ponds, dams and alluvial soil with good fertilizer and water conditions should be selected for planting.

The varieties can be selected from New Century, Crystal, Pearl and Red Fan. The survival rate of grafting guava is low, and grafting seedling is often used except for seedling raising and high pressure seedling raising. The plant spacing can be 3×4 (m) with 55 plants per mu, or 2×3 (m) with close planting 1 10 plants per mu. The best planting season of guava is spring, with warm climate, abundant rain and high survival rate from March to April.

Second, fertilizer and water management.

Fertilize once before flowering and once after fruit picking, mainly using organic fertilizers such as livestock manure. Apply 25-30 kg to each plant each time, and add 0.5- 1 kg compound fertilizer. After the flowers wither to the fruit development stage, apply decomposed manure once every half month. Water every 10- 15 days in dry season.

Third, shaping and pruning

Guava is naturally cup-shaped, its head hangs happily, and it is shaped by removing the core and pulling branches. In order to achieve full-year results, after fruit setting, the leaf tips above the sixth node should be picked to make the leaves mature early, so as to facilitate flowering and fruiting again. Close-planted orchards can be recovered and pruned as a whole.

Fourth, flower thinning, fruit thinning and bagging

Keep only one flower on the new shoot, remove one flower from the two-flower group, remove two flowers from the three-flower group, and keep the sessile flower in the middle. Fruit thinning depends on the development of leaves and branches. Large and thick leaves remain more, while small and thin leaves remain less, with 1-2 fruits per branch, and delicate branches leave no fruits. In order to prevent pests and diseases and improve fruit quality, bagging should be carried out when the diameter of young fruits reaches 1 cm, and pesticides for preventing pests and diseases should be sprayed once before bagging. Bagging material: the inner layer is covered with foam net bag, and the outer layer is covered with paper bag (summer and autumn fruit) or plastic bag (winter and spring fruit).

V. New technologies for delivery supervision:

(1) physical method: remove the core, that is, pull out the buds immediately after the new buds of guava sprout. In order to induce flowering, 8- 10 leaves or mature parts can be picked from the top of the fruit, and axillary buds will grow new buds after 30-40 days. The methods of "Qingming" and "Bailu" to accelerate germination were used to cultivate winter and spring fruits. That is to say, before and after Tomb-Sweeping Day, all the flowers and small fruits will be picked off, and the branches will be pruned as appropriate, so as to promote the "White Dew Flower" in mid-September and bear fruits in winter and spring. After the whole plant is retracted and pruned, it can germinate and bloom neatly in 30-50 days.

(2) Chemical methods. (1) spray the whole plant with 15%-25% urea solution until the leaves drop, so that all the leaves of the plant burn off. After 35 days, the new buds can blossom. (2) spraying 40% ethephon and 0.05-0.06% ethephon on the leaves, and sprouting and flowering 35-40 days after defoliation.