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The burrs are bright and happy. They grow poorly in shade, have strong cold resistance, prefer good drainage of sandy loam, and have a certain resistance to salt and alkali. They can be in PH8.7 and light saline-alkali soil with a 0.2% salt content. Normal growth. Grafting seedlings are not strong against wind, and should not be planted in tuyères or open areas, otherwise they are prone to "turning around". Drought-resistant, not wet. Resist pruning. It has strong resistance to toxic and harmful gases such as hydrogen fluoride.
two. The management of water and fertilizer burrs on the water is not high, and large seedlings usually grow with reliable natural precipitation. For newly planted seedlings, watering management should be appropriately strengthened. When planting, the first three waters should be poured. After that, water should be poured once a month, and the feet should be poured into the frozen water after the end of the fall. In the early spring of the following year, the frozen water is poured in time, and the rest of the time is reliable and natural precipitation. The frozen water is poured in the late autumn. After three years of transplanting, you only need to pour thawed water and frozen water every year.
The burrowing crickets are more resistant to lice, but sufficient fertilizer can make the seedlings grow vigorously. In particular, when the new seedlings are planted, the appropriate amount of fertilizer can be used to allow the seedlings to quickly restore the tree vigor. When planting, it is best to apply the fermented beef and horse manure. The efficacy of beef and horse manure is moderate and lasting for a long time, and no root burning phenomenon will occur. At the beginning of June, urea can be applied once, which can promote the long branches and long leaves of seedlings. In the late autumn, combined with pouring frozen water, a rot leaf fertilizer can be applied briefly. From the second year onwards, one time rotting leaf fertilizer can be applied every year when the frozen water is poured.
three. Pruning and plastic surgery in North China, Burrock clams are mostly used as rootstock for grafting, mostly as large shrubs or small arbors. In pruning such seedlings, first of all, attention should be paid to the appearance of the entire crown shape. The crown shape must be maintained in the form of an umbrella, and excessively dense branches must be removed in time, and long branches must be short cut. We must promptly remove pests, stems and unused branches. For the sprouts produced by the rootstock, they should be erased in time.
four. Propagation methods The breeding of burr clams is mostly done with hedgehog as the rootstock. Grafting is usually done before sprouting in the spring, and cutting methods are often used. Rootstocks should be selected to have a breast diameter of 6 cm or more, and the hedgehogs that have been transplanted many times will have straight trunks, strong growth, and no pests and diseases. The scions can be selected from plants that are robust and free from pests and diseases. Generally, the branches with higher 2-year-old lignification are selected for scion, and the length of the scions is generally 8-10 cm. When grafting, the scions should be cut into a wedge shape, and the scion and rootstock cortical should be well-matched, and then tightly wound with a plastic tape. Do not make it loose. The grafting place is sealed with wax and then put on a plastic bag for moisturizing. About 20 days, the wound can heal, and the scion draws a bud.
Fives. Diseases and Insect Pests The common disease in the burrow plague is purple feather disease, which often causes the roots to rot and the trees are easily blown off by the wind. If this happens, sprinkle plant ash at the root of the tree from July to August at a rate of 1 kilogram per plant, then turn the soil over and pound it. Burr grasshoppers are also susceptible to powdery mildew and coal contamination. If powdery mildew occurs, 15% triadimefon can be sprayed with 1000 times liquid. Once every 7 days, continuous spraying 2-3 times can effectively control the disease. If there is a coal contamination, first kill the aphids and scale insects, and use 50% carbendazim 1000 times spray, once every 7 days, continuous spray 3-3 times can effectively control the condition.
The cultivation technology of burrs
one. Morphological characteristics and ecological habits The burr height is up to 2 meters. The stems, small paper strips, and pedicels all have red bristles. The stipules do not become spiny, broadly elliptic to suborbicular, 2-3.5 cm in length, obtuse and pointed at tip, pink or purple-red, 2.5 cm long, 2--7-flowered racemes, flowering May-June. Follicles 5-8 cm in length with glandular burrs.