The quality of forest seed directly affects the success or failure of nursery. Therefore, the quality of forest seed should be inspected strictly before harvesting seed and seedling. The inspection method is as follows: Visual observation method: (1) Fresh and mature forest seed seeds are bright and fresh in color, such as Pinus massoniana seeds are gray-brown or gray-brown; Pinus tabulaeformis seeds are dark gray or gray-brown; Chinese fir seeds are yellowish brown or Chestnut brown; (2) Immerse the seeds in water for one day. After swelling, cut with a knife along the abdominal suture to see if the color, state, juice, and odor of the embryo, endosperm and cotyledon are normal. For normally grown seeds, embryos and endosperm are plump and milky white. For example, the seed of Pinus massoniana is pale white with more oil; the seed embryo of Chinese fir is light red white. The embryos of the stunted and old seeds are mostly yellow and black, with insufficient oil content, hard texture, rot, mouldy or powdery; some seed embryos are normal in color, but the cotyledons are dark brown or black and cannot be used for sowing. Nose sniffing method: Many forest seeds have a special smell. For example, pine seeds and cypress seeds often have turpentine and turpentine odors. If a savory odor is emitted, it indicates that the seed is bad and should not be used as a seed. Ups and downs: Generally, the proportion of the seed is sinking, and the seeds of the bad larvae float on the surface of the water to test the quality of the seeds. However, if the seeds of pine and cedar trees are lighter than water, both the good and bad seeds are floating, and an appropriate amount of alcohol can be added to the test water; conversely, some seeds have a larger specific gravity than water, and bad seeds will sink. You can add 3-5 in the test water. % of the salt, so increase the buoyancy of the water, the bad seed is better, the seed is lighter, and it will float on the water. Listen with the ear: For large seeds such as tung tree, bolt, etc., grab any one and shake it in the seed pile. If there is noise, the seeds are dry, not full, the germination rate is not high, and the viability is low. Use the fire to fry: Put a small amount of seeds into the pot or heat and fry on the iron plate. All the seeds that can give off the explosion can germinate, but the sound of the explosion is louder and the quality of the seed with louder sound is better. On the contrary, the quality of seeds is poor and their viability is weak. Even if they can germinate and emerge, their growth is also weak and they should not be used. Pressing seeds observation: first immersed in the water for 10-12 hours, then use the fragments to squeeze, press the white pulp is a good seed, such as squeezing only water or bubbles, it is a poor quality seed, can not be selected as a species use. All localities can adjust measures to local conditions and arbitrarily choose one or both of the above methods. They can make serious inspections on the seeds of trees and can identify the advantages and disadvantages, select the best ones, and choose inferior ones for production.
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