The Latest Tutorial on Orchard Management Techniques and Methods for Growing Rosa roxburghii
Fertilisation
7 to 10 days before the spring, summer and autumn shoots sprout, apply a quick-acting fertiliser, focusing mainly on nitrogen fertiliser to promote shoot growth and leaf development. In the 2nd and 3rd years, the amount of top-dressing must increase year by year. Before the summer and autumn shoots sprout, apply 0.05 to 0.1 kg of urea or 5 kg of clear manure water per plant as top-dressing. After each season's shoots and leaves have sprouted and taken shape, spray the foliage with potassium dihydrogen phosphate or another highly efficient compound fertiliser to promote the maturity of the shoots and leaves. Starting from the outer edge of the planting hole, dig deep and expand the hole year by year while pressing in green manure, to improve the soil and use the orchard to support the orchard, ensuring the normal growth of the fruit trees.
15 to 20 days before flowering, apply 0.1 to 0.2 kg of urea, or 15 to 20 kg of clear manure water, per mature fruiting tree as top-dressing, to ensure the normal growth and development of flower buds and leaf buds. After the flowers fall, promptly spray with a 0.5% urea solution to supplement the tree's nutrients and promote the normal development of the young fruit. From late June to early July, spray the foliage of each plant with 0.5% potassium dihydrogen phosphate and apply 0.25 kg of urea or 30 kg of manure water to the soil at the root of each plant. Depending on the nutritional status of the tree, spray the foliage again with 0.5% urea solution, once every 7 to 10 days, for 2 to 3 consecutive times, to promote fruit swelling and improve yield and quality. Apply sufficient base fertiliser and improve the soil, to lay the foundation for extending the full fruiting period and for a bumper and stable harvest the following year.
Diseases
The main pests and diseases of Rosa roxburghii include the pear fruit moth and the peach fruit moth, the rose long-tube aphid, the rose white scale and powdery mildew. To control the pear fruit moth, peach fruit moth and aphids, you may choose 40% dimethoate emulsion at 1500 times dilution, 80% dichlorvos at 2000 times dilution, or fenvalerate at 2000 times dilution; for the rose white scale, spray 5-degree lime sulphur mixture in winter. For powdery mildew, use 70% thiophanate-methyl wettable powder at 800 to 1000 times dilution, or spray 15% triadimefon wettable powder at 1000 to 1500 times dilution. For the control of pests and diseases of Rosa roxburghii, attention should be paid to autumn orchard clearing: pruning out diseased and pest-damaged dead branches and diseased and pest-damaged fruit, turning over the soil, and spraying chemicals to sterilise and kill insects.
Irrigation
The root system of Rosa roxburghii is relatively shallow and its drought resistance is relatively weak, so the construction of water conservancy facilities must be strengthened; in the dry season, divert water for irrigation or cover the tree basin to keep the soil moist.
Pruning
The buds of Rosa roxburghii have the characteristic of strong sprouting and branching ability; the tree crown is short and small with luxuriant branches and leaves, and there is no obvious apical dominance or vertical dominance. Therefore, Rosa roxburghii should not be forcibly shaped and pruned; it is best to let it grow naturally. When pruning, only diseased and pest-damaged branches, dead branches and senescent branches should be cut out. For groups of senescent branches, heading back should be used to promote the growth of strong branches. For mature trees, one must begin to properly regulate the relationship between growth and fruiting, so that Rosa roxburghii achieves the goal of stable and high yields.