A Detailed Guide to the Cultivation Techniques and Management Key Points of the Rose Apple

The rose apple is highly adaptable and can be planted in all kinds of soil. It mostly grows beside water and in river valley wetlands, and also grows well on sandy soil. Fertile, deep and moist soil is best.

I. Regional Selection

Choose a location with ample sunlight and a hot, humid environment; select fertile, loose, moist soil, and apply more organic fertilizer to lean soil. For establishing the orchard, choose a site sheltered from the wind; slightly acidic sandy soil is most suitable, and sandy loam to red soil ranging from slightly acidic to slightly alkaline (pH 5.5-7.8) is also suitable. It is sensitive to frost and afraid of drought. A large day-night temperature difference helps improve fruit quality.

II. Planting Season

It can be planted in all four seasons (in tropical regions). The best time to plant is at the beginning of the rainy season, but where irrigation is available, planting when temperatures rise is best.

III. Seedling Selection

For seedlings, generally choose one-year-old container seedlings grown in nutrient bags from improved varieties, or bare-root seedlings. Requirements are a seedling height of more than 50 cm, a well-developed root system, freedom from pests and diseases, no mechanical damage, and vigorous growth.

IV. Orchard Establishment and Planting

Dig holes 1 m long and 1 m wide and 0.5 m deep. The planting spacing is 2.5 m × 4 m, that is, 66 trees per mu; after the canopies meet, carry out thinning. After thinning, the planting spacing is 5 m × 4 m, that is, 33 trees per mu.

1. Planting bare-root seedlings

This is generally done in spring on rainy days when the soil in the holes is thoroughly wet. Before planting, the seedlings should be properly pruned of branches and leaves, and the roots trimmed as appropriate. Before planting, protect the roots by dipping them in yellow mud slurry mixed with a small amount of phosphate fertilizer and rooting powder (such as GGR-6). Plant in the hole or slightly against the inner wall of the hole. Requirements are deep planting, spread roots, firm pressing, straight planting, no root curling, and no reverse placement. After planting, cover with loose soil. Planting should be completed before March. But carry out root dipping (as applied), and choose rainy days for planting. When planting, spread the roots, press firmly, and plant appropriately deep.

2. Planting nutrient-bag seedlings

This is generally done in spring. Before planting, water the nutrient soil thoroughly. When planting, gently press the nutrient soil with one hand and completely tear off the nutrient bag with the other, then plant in the hole or slightly close to the hole wall. Plant deep, press firmly (when pressing, take care to press around the edge of the nutrient soil ball, and do not crush the nutrient soil ball), plant straight, keep the nutrient soil intact, and then cover with an appropriate amount of loose soil.

V. Maintenance and Management

1. Water

Do not water before sprouting. If rainfall is poor, water once 10-15 days before emergence, and promptly hoe to raise soil temperature. After the seedlings emerge uniformly, water once, then appropriately control water to harden the seedlings, and hoe frequently. After budding, water once. After flowering, the plants enter the tuber formation stage, and the soil should be kept moist. In dry weather, water frequently. Generally, water once each at the beginning of flowering, at full bloom, and within 1 week after the flowering stage. Stop watering 5 days before harvest.

2. Fertilization

If fertilizer is applied sufficiently as required, generally no additional fertilizer is needed during the growing period. If the base fertilizer is insufficient, then for additional fertilization, apply it early to prevent excessive vegetative growth. During the seedling stage, apply 10 kg of urea or diammonium. If signs of excessive growth appear, spray 500 times diluted chlormequat on the leaves. For additional fertilization 3-4 years after planting, the trench application method should be used, applying 0.1-0.2 kg of compound fertilizer to each young tree.

3. Cultivation

In the 3-4 years after planting, carry out continuous loosening of the soil and weeding according to the growth of the seedlings. The specific method is: according to growth conditions, carry out one tending operation in a timely manner in each of the first and second halves of the year. Cut or hoe clean the weeds and miscellaneous shrubs in the strip or around the hole (hole clearing is generally a range of 1 m × 1 m around the hole), do not press green manure, and place the cut or hoed weeds around the base of the young trees, and loosen and mound soil around the young trees.

When differentiation appears in growth, carry out thinning and tending reasonably according to growth conditions and cultivation objectives. The thinning intensity should be 10%-15% each time. During thinning, take care not to damage the seedlings being retained.