The specific judgment method is as follows(propagation tray): the color of dry seeds is bright and glossy, and when you look at them with your hands, you can hear the sound of sand falling on the ground: when you insert seeds into the pile with your hands, you feel the seeds are smooth and easy to insert into the lower layer, and there is a cool feeling in summer(black plastic plant pots); when the seeds fall from a high place, there is a sound, and the speed is fast.
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When teeth are biting, the seeds are hard and brittle, and the section looks smooth(cell trays). The exposure time of seeds to air should be as short as possible. The quality of forest seed directly reflects the scientific and technological level and management level of forest seed in a country(flat plastic tray). The number of good seeds, poor seeds and empty, astringent, embryo free, rotten and insect damaged seeds found in each repetition shall be recorded in the record of human excellence.
(bulk buy cheap plastic five gallon planter mexico)Some seeds with excessive drying have high water content, such as excessive water loss(plug trays). In production, we should pay special attention to the determination of water content of seeds before purchase and storage. In the process of purchasing, allocating and using seeds, we can avoid the huge loss of economic and ecological benefits caused by using inferior seeds(nursery plant pots). The classification of forest seed quality is of great significance in the production.
The inferior seeds have the following sensory manifestations(square nursery pots): the seeds are shrunk or shriveled, lose the unique color, elasticity and smell of the fresh seeds of the tree species, or are mothed, or have mildew symptoms, or have peculiar smell, or have mildew. When the teeth bite, the seeds become soft but not brittle, and even the bite fan does not crack(large plastic terracotta pots), and the water content indexes must be determined for seed acquisition, transportation and temporary storage.
For example, when the seeds are too dry, shake them with your hands to make a sound: the testa of Pinus arvensis shrinks; oil paste(gallon nursery pots). The seed shells of rarefied trees, wiped wood, Magnolia officinalis, Magnolia, etc. are fragile, the seed shells of plate vegetables are soft and sweet, and the taste of walnuts is fragrant(4.5inch square nursery pots). All these are the manifestations of excessive drying of seeds, put it in the dryer and cool for 30-45 minutes before weighing.(bulk buy cheap plastic five gallon planter mexico)
Take out 2 samples randomly and quickly(plastic grow pots), put them in the pre dried aluminum box or weighing bottle, put them in the electric oven, open the box (bottle) cover, put the cover on the box (bottle), dry to constant weight (generally 17 hours), quickly close the cover. The main technical indexes of forest seed quality grading include(seed starter trays): the technical indexes of the seed purity, germination rate, viability, excellence of the main afforestation tree species in China.
(bulk buy cheap plastic five gallon planter mexico)The seed quality classification of forest trees is the most suitable for seedling cultivation, afforestation and domestic and international trade(gallon plant pot). The seed quality is divided into three grades according to the seed purity, germination rate, viability, goodness and water content(4.5inch deep square pots). If the technical indicators are not at the same level, the lowest single indicator shall be used for rating, which makes germination difficult and easy to lose, management and use of forest seed.