How can BlackBerry achieve high yield?

Blackberry, blackberry, Rubus, Rosaceae, shrubs native mainly to the northern temperate regions of the Old and New World, especially along the eastern coast of North America and the Pacific Ocean, and common coppice and hedge plants in the British Isles and Western Europe. Usually biennial, stems erect, semi-erect or climbing, spiny; sometimes cultivated species spineless. Leaves are trifoliate or palmate compound leaves, leaflets wide, elliptic, stipitate, leaf margin coarsely toothed, most leaves persist through winter. Inflorescences terminal, white, pink or red. Fruit an aggregate fruit, black or purple-red drupe borne on a succulent receptacle. Some trailing species of Rubus have no woody fibers on their stems and are called dewberries. There are now tens of thousands of blackberry hybrids and varieties planted on 4,000 hectares (10,000 acres) in the United States and 405 hectares (1,000 acres) in the United Kingdom. Blackberries are rich in iron and vitamin C and can be eaten fresh or made into preserves, jams and jellies, or pies. Blackberry originated in North America, belongs to Rosaceae vine, perennial, fruit juicy, tender, crystal clear, purple-black, nutritional value far above apples, oranges, grapes, is the world's most rapid development in recent years, the third generation of emerging fruit, with high development value. Its high-yield cultivation techniques are as follows.

1. Apply enough basal fertilizer and plant closely reasonably. Select valleys and fields with good fertility, loose soil and good drainage, apply 1000 - 1500 kg of decomposed farm manure and 120 - 150 kg of calcium superphosphate per mu, and generally plant 800 - 900 plants per mu. Seedlings should choose the main stem stout, developed roots, full bud eyes, no plant diseases and insect pests. When planting, first comply with the roots of seedlings will be placed straight, and then covered with soil buried compaction, irrigation through the roots of water, after every 2 - 3 days wash water, until survival.

2. Pruning after planting. Blackberry pruning in winter is very important, pruning quality, pruning how much directly related to the next year's yield and quality. Generally, each plant leaves 2 - 3 strong branches, each branch leaves 0.4 - 0.6 meters long about 6 - 7 buds, and the long part is cut off to avoid consuming nutrients. After the buds grow to 10 - 20 cm long in the spring of the following year, each branch will leave 2 - 3 strong buds, and all excess buds will be removed. When pruning, attention should also be paid to dividing the branches and buds into upper and lower layers to make full use of light.

3. Management after pruning. Blackberry in the south after the Spring Festival generally began to sprout, then should be applied "germination fertilizer", mainly nitrogen, phosphorus-based, per mu according to ammonium hydrogen nitrate 10 kg, urea 15 kg, phosphorus fertilizer 20 kg of water twice. Apply twice before and after flowering and twice every month at fruit expansion stage. At the same time combined with foliar fertilization: spray treasure, potassium dihydrogen phosphate, urea and fruit big fruit agent in flowering every 10 days spray once, spray 3 - 4 times. From the end of April to the beginning of May in the south, in mid-May in the north, some blackberries began to mature, and some stopped fertilizing when they were still flowering.

4. Blackberry tillers are extremely strong and there are many branches. Most branches should be pruned under dense planting conditions, which can ensure that nutrients are concentrated on a small number of fruits, so that the particles multiply and achieve dense planting and ventilation. Generally, after such pruning, the single grain weight of blackberries can reach 12 - 15 grams, and the weight per ear is about 0.5 - 1.2 kilograms. The yield per mu is also increased by 700 - 900 kilograms without pruning and non-dense planting. 1200 - 1500 kilograms, the economic benefits are very significant.