Poinsettia tender shoot cutting technique

Now high-grade poinsettia seedlings are generally taken in the greenhouse in the foam or peat soil as the substrate, with the shoots as the cuttings of young shoots, seedlings grown with this method are growing neatly, developed root system, high survival rate. The cutting technology with foam as the matrix is ​​introduced as follows:

A. Scissor cutting

Tools to be prepared before cutting seedlings: Clean plastic bags, punch 8 to 10 vent holes with a diameter of about 5 mm in the bag, spread a wet newspaper in the bag, and use 5 knives for cutting. 0.3% to 0.5% pots of potassium permanganate disinfectant.

Before the seedlings are taken, the shade net in the work area is opened. The mother plant that takes the seedlings should be an excellent breed that is specially cultivated. Do not take the seedlings from the plants that had spent the flowers, and use cutting tools to cut long-lived, disease-free pests from the mother plants. Young shoots, 3 to 4 cm in length (including the length of the shoots). Remove one to two leaves from the bottom of the tender shoot. Take 10 shoots of each shoot immediately into the bag to avoid excessive water loss from the shoots. The five mother plants should be replaced with one tool. The used tools should be put back in the pot containing potassium permanganate disinfecting solution. After being sterilized, they can be used again. The picking and placing of the tools should be in chronological order.

Each bag can be loaded with about 150 shoots. After each bag is filled with cuttings, the cuttings are wrapped in wet newspapers, and the bags are sealed. The type, quantity, and harvester of the cuttings are written on the outside of the bags. The purpose of doing so is to prevent the confusion of varieties and the monitoring of the cutting quality of the harvest. After the cuttings are harvested, the fungicides should be sprayed on the mother plants.

The harvested cuttings should be transported to a warehouse or air-conditioned room with a temperature of about 18°C ​​as soon as possible, and stored for about 1 day before they are cut out. Do not take the cuttings immediately after they are taken, because the glue that has not yet flowed through the incisions of the young shoots will solidify, and the cutting will affect the rooting of the cuttings in the future.

Second, cutting

Prior to cutting, the iron bed, card slot, and plug tray (the new plug tray can be disinfected) used for disinfecting should be disinfected. The iron bed can be disinfected with common disinfectant sprays. The tanks and trays can be soaked with 0.3% to 0.5% potassium permanganate solution.

Place the card slot on the iron bed and fix it. The interval between the slots is about 6 cm. Then insert the slot into the slot and place the foam in the slot. Before the cutting, three times of water is immersed in the foam, in order to fully soften the foam and wash off the dust residue in the foam so as to avoid water accumulation in the roots.

During the daytime cutting operations, the shade net in the work area should be opened, and pasteurized with red mud pasteurized with appropriate amount of acetic acid as the rooting agent. When the cuttings are cut, the rooting agent is cut and the depth of the cutting root is about 1 cm, and the cutting depth is just sufficient to expose the whole shoots. Sprinkle water as soon as possible after cutting.

Third, late management

1. Divided: The leaves that cover the buds and the leaves that are too veiled. On the same day or the day after the cutting is completed, the cutting seedlings will be diverted. The purpose of the pinching is to allow the buds and leaves to receive the light better. This work will be followed one or two times depending on the growth of the seedlings in the subsequent seedling management work.

2. Fertilizer and water management: Poinsettia is slightly acidic, and the water pH should be about 6.0 to 6.5 to keep the substrate moist. Before the roots are sprayed on the leaves, they are sprayed in the daytime. The normal situation is about 30 minutes once every 3 to 5 minutes. Leaves moist. Stop the spray in the evening to avoid the disease caused by excessive humidity at night. This is especially important in the low temperature season.

After the rooting, the spray is stopped. According to the wet condition of the substrate (foam), the water and fertilizer are applied once every 1 to 2 days. Generally, no watering is required at this stage. The EC value of water and fertilizer is 0.8. The EC value and pH value of the effluent should be measured for each leaching fertilizer. If the EC value of the effluent is too high, it should be changed to be rinsed with water. About 15 days after cutting, the EC value of water and fertilizer is increased to 1.0. The fertilizer used for water and fertilizer is preferably a special fertilizer for the growth of poinsettia.

3. Light, temperature, and humidity management: In addition to strong light in summer, under normal conditions there is no need for shading. In autumn and winter, seedlings are supplemented by light for 3 to 4 hours at night.

The humidity in the daytime is kept at about 85%, and the humidity in the shed at night is appropriately reduced. The humidity in the booth during the daytime should be 25°C to 28°C. It is advisable to use about 20°C in the evening. The temperature in the winter night should not be lower than 15°C. If it is lower than 15°C, it should be covered with a film or heated with a heating machine.

4. Diseases and pests control: The common diseases are root rot and stalk rot, which can be controlled by thiram and benzoin.

The common insect pests are whitefly and aphids, and they can be used to prevent and control fleas. A pest control was performed every 10 days or so, and the back spray method was applied.

Cuttings can be rooted after 7 to 10 days, and seedling heights of 6 to 8 cm for 25 to 30 days are the best timings for basins.

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