The latest course of cutting techniques and methods of Photinia rubra

In production, Photinia chinensis is mainly propagated by cutting, which has the characteristics of low cost, simple operation and high survival rate. The propagation technology which can be produced in ordinary plastic greenhouse is suitable for the popularization and application of most tree nurseries. Let's take a look at the cutting propagation technology of Photinia rugosa.

Cutting preparation of Photinia rubra

Select the field construction nursery with good drainage, dry rain, low water table, convenient transportation and stable water source, use single greenhouse cutting, cover greenhouse film, add sunshade net, and set up ground cutting nursery after leveling the ground in the sheet. the width can be about 100 cm, a baffle 10-12 cm high can be installed around, the bottom is covered with a layer of fine sand to facilitate drainage, and the cutting substrate can be made of vermiculite and peat. Or use clean yellow soil plus fine sand, seedbeds and substrates should be disinfected with fungicides and pesticides to prevent diseases and insect pests.

Cutting method of Photinia rubra

1. Cutting time: the requirements for cutting time of Photinia chinensis vary from region to region. Spring, summer and autumn are better in the middle and lower reaches of the Yangtze River. Generally speaking, the temperature is between 15-35 degrees, and the most suitable is 20-30 degrees. Therefore, late April-late June, late August-mid-October is the cutting golden season of Photinia rugosa.

2. Selection of ear strips: select sturdy semi-lignified annual branches as cuttings, the cuttings are 3-5 cm long, the upper and lower cuttings are cut flat, half of the leaves are generally retained because of the appropriate temperature in the golden season of cuttings, and a small half of the large leaves are left according to experience. It is more appropriate to leave more than half of the leaflets, pay attention to the ear cuttings moisturizing, shading and watering, and it is best to use special scissors when cutting cuttings, which is smaller than the wound of ordinary flat-mouth scissors. The phloem of cuttings is inward, the xylem is slightly concave to the center, the cuttings are easy to produce callus and rooting, and the survival rate is high. Cuttings and cuttings are best cut on cloudy days and before 10:00 and after 4 p.m.

3. Cutting method: the rooting time of Photinia chinensis cuttings can be advanced from 40 days to 7-15 days, so the cuttings should be rooting before cutting. the commonly used rooting agents are finished ABT, Guoguang, and biochemical raw materials such as naphthalene acetic acid and indole butyric acid. Before cutting, the nursery bed should be watered thoroughly, and the cuttings should not be too deep into the soil. Generally, the leaves at the top of the cuttings should face in the same direction, so that the light they receive is uniform, which is conducive to early rooting and early sprouting, and then poured through water after cutting. After the leaves are dry, they can be sprayed with 600-800 times solution of methyl topiramate and chlorothalonil to prevent disease, and finally cover the whole seedling bed with a small arch shed film.

Post-planting management of Photinia rugosa

1. Shading and topdressing: from cuttage to root sprouting, shading rate should be kept above 75%. Foliar topdressing should be carried out frequently after cutting, which can be combined with spraying to prevent disease at the same time, from callus formation to young root growth. 50 × 10-6 nitrogen fertilizer can be sprayed, and the nitrogen concentration can be increased to 100 × 10-6 to 150 × 10-6 before transplanting.

2. Pest control: disease and pest control should be strengthened after cutting. 800 times carbendazim and methyl topiramate should be sprayed at the end of cutting, and then every 5-7 days. Fungicides must be sprayed in time after rain. Anthrax is mainly prone to anthrax during the cutting period, and periodic control is needed. Control agents are mainly anthrax Fumei, mancozeb, chlorothalonil, etc., insect pests are mainly aphids and moth larvae, control agents are imidacloprid and cypermethrin and so on.

3. Strengthen management: after 15 days, some ear strips begin to root, and the water content of the substrate should be reduced appropriately, generally about 40%. When more than 50% of the ear strips begin to root, the film can be gradually opened and ventilated, and the shading can be reduced to about 50%. When the panicle strips all take root and more than 50% leaves, gradually remove the shading net and film of the greenhouse, give more sufficient light, and begin to refine seedlings.

4. Pot for refining seedlings: pot for rooting seedlings, medium with 80% peat + 20% perlite. Generally, peat should add lime to adjust pH value and supplement calcium at the same time. Seedlings are easy to freeze at the seedling stage, so it is best to spend the winter in the greenhouse, or reduce the supply of water, without fertilization, and spend the summer in the shade shed when the summer temperature is high. Water management should pay attention to dry and wet. Fertilizer management generally mix 4 kg of slow-release fertilizer per cubic meter of medium, and then regularly apply 700-1000 times of nitrogen water-soluble fertilizer.