When planting potatoes, in order to ensure Miao Qi, Miao Zhuang, seed germination technology can be used to cut pieces of potatoes. Seed cuttings
The cut size generally requires that the cut weight should not be less than 20-25 grams, that is, 20-25 cuts per 500 grams of seed potatoes. Take at least 1-2 buds on each cut.
Dicing method Seeds of 50 grams or so can be cut into 2 pieces from the top to the tail; 70 to 90 grams of the tubers are cut into 3 pieces by cutting the 1 piece with 2 buds from the base and the remaining part. Cut into 2 pieces; about 100 grams of seed potatoes can be split into 4 pieces, which is conducive to increasing the number of apical buds. For large potato chips, it is possible to start from the tail of the seed potato, spirally incline to the top in the order of the buds, and finally divide the top into two.
Matters needing attention .1. In the cutting block should pay attention to cutting should not be too small. Because the smaller the block, the less nutrients and moisture are taken, which will affect the development of seedlings. In addition, if the cuttings are too small, their drought resistance is poor, and the seedlings are likely to appear seedless after sowing. 2. When the diseased potatoes are cut, they should be destroyed, and the cutters should be disinfected, otherwise they will spread the germs. The disinfection method is to use a fire barbecue cutter, or repeatedly scrub the cutter with 75% alcohol, or use 1% potassium permanganate for immersion and reuse. Germination method
After the potato chips are chopped, they are first dried at a temperature of 17° C.-18° C. and a relative humidity of 80%-85% to dry the wound. It takes 3-4 days to produce a cork layer so that the germination process can be avoided. Medium rotten potatoes. In the dry cutting, can not be carried out in a too dry environment, so as to avoid excessive loss of water in the tuber. After the potato pieces are "dried," they can germinate. The commonly used germination methods are as follows.
In greenhouses, germination takes place on the walkway near the root of the greenhouse or in the plastic canopy (away from the end of the shed), and 2-3 layers of brick walls are used to build a pool, depending on the number of seed potatoes. If the ground is too dry, it should be sprayed with a small amount of water to make it slightly moist, then spread a layer of potato chips, sprinkle a layer of wet sand or wet sawdust (note disinfection, sunlight disinfection, burning disinfection, drug disinfection and other methods) In this way, three to five layers of tubers can be paved, and then the upper surface can be covered with straw or sacks for moisturizing, but the plastic film cannot be covered.
Nursery seedbeds can use existing seedbeds or dig a seedbed. The germination method is to level the bed first, then spread a layer of wet sand on each layer of potato block, spread a total of 5 layers of potato chips, and finally cover a layer of grasshopper on the sand. The bamboo shoots are laid on the seedbeds and covered with a thin film. The earth is pressed well around the seedlings and covered with grass and straw to keep warm at night.
When the number of indoor germination seedlings is small, germination can be directly performed indoors. The potato pieces can be packed in the basket, or they can be spread on the ground at a thickness of 10-15 cm, and then the baskets or potato piles can be tightly sealed with wet sacks or wet grass.
Management during germination
Humidity during humidity germination should not be too large. The sand or sawdust that covers the seed potatoes should be moistened with water and then sprinkled on seed potatoes. Can not cover the dry sand and then splash water, so there will be a lot of water seepage on the seed, causing excessive humidity. The humidity of the sand is not suitable for hand-held water. During germination, as long as the sand is not very dry, it is generally not watered. If the humidity is high during the germination, it is very easy to cause rooting of the shoot stems. These roots will shrink or die due to water loss before the sowing, which will affect the occurrence of new roots after sowing.
The optimal temperature for potato pregermination is 15°C. Temperatures below 4°C basically do not germinate, and temperatures above 25°C germinate faster but shoots are weaker.
During germination check, germination should be checked every 5-7 days. If the rotten potato is found, it should be picked out in time. At the same time, the other potato chips should also be picked up for drying and then germination.
The appropriate sowing shoot length for green shoot potato is 1.5-2 cm. When the shoot length reaches 1.5-2 cm, the buds are placed under scattered light in the room and the buds turn green. After the buds turn green, their water content is reduced, they become strong, they are not easily knocked off at the time of sowing, and the seedlings emerge quickly and seedlings are strong.
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