Watermelon seeds swell through water absorption, germinate, seedlings emerge, seed coats fall off, cotyledons expand, and the first true leaf (two leaves and one heart) are revealed as the germination period.
Watermelon seeds must first absorb water to germinate and make the seeds change from dormant state to germinating state. When the water absorption reaches 65% to 75% of the dry seed weight, the protoplasm of the storage material in the seed begins to change from gel to sol state, and nutrients The macromolecular state, such as starch, protein, fat, etc., is transformed into small molecular substances such as monosaccharides, amino acids, and fatty acids that can be easily absorbed to provide energy for the seed buds to unearth. In this process, if the water supply is too low, it cannot meet the needs of the internal physiological activities of the seeds, can not germinate normally, or even "dry buds"; too much water supply will make the seeds reach a supersaturated state, the seed coat has poor air permeability, and affect oxygen supply. Easy to cause rotten seeds.
Watermelon mainly consumes the nutrients stored in the seeds during the germination period, so the absolute weight (fullness) of the seeds and the storage life of the seeds have an important influence on the germination rate and the quality of sprouts. The viability of watermelon seeds decreases with the increase in the storage life of the seeds. Although the useful life of the seeds is 5-7 years, the germination rate of the seeds of 1 to 3 years is high and the germination vigor is neat.
The length of the germination period of watermelon mainly depends on the height of the ground temperature: high ground temperature germinates quickly, and low ground temperature germinates slowly. The ground temperature is between 15 and 20 ℃, and the germination period takes 7 to 13 days; when the ground temperature is 25 to 30 ℃, the seedlings can emerge within 3 to 4 days. When raising watermelon seedlings in the low temperature season in early spring, listen to and watch the weather forecast to ensure that there are 6-7 consecutive sunny days after sowing, and the shed film is tightly warmed; fire channels and grounds should be used in severe weather such as cold currents, rain, snow, and haze. Heating equipment such as hot wire and hot blast stove raises the ground temperature so as not to affect the emergence of seedlings due to long-term low temperature and high humidity.
Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone
The main differences between powder,premixed agent, granule are as follows:
Veterinary Soluble Powder: means a dry powder preparation made of one or more drugs by grinding and evenly mixing, with or without dressing.
Premix: refers to one or more drugs, and a suitable substrate evenly mixed to make a powder or granular preparation.
As a dosage form of feed drug additive, it is specially used for mixed feeding.
Powder powder, that is, powder, and premixed agent, the main differences of granules are as follows:
1.the production method is different
1.powder: medicine or with appropriate auxiliary materials by grinding, evenly mixed dry powder preparation.
2.Veterianary premix: powder or granular preparation made by evenly mixing the drug with an appropriate substrate.
3.granules: raw materials and appropriate excipients mixed into a certain particle size of dry granular preparation.
2.different characteristics
1. Dispersing agent: compared with other solid dosage forms, dispersing agent is easy to disperse, dissolves quickly, absorbs quickly and takes effect quickly; The preparation process is simple, the dosage is easy to control, and it is easy for infants to take.
2.Premix for animal: Premix used in the matrix including carrier, diluent, etc. The substrate should be stable, with good fluidity, and easy to mix with drugs and feed.
3. Granule: the dispersion, adhesion, agglomeration and hygroscopicity of granule are lower than that of granule; The separation of various components in granule is avoided because of the adhesive used to make granule after mixing. Convenient storage and transportation; Particles can change their function by coating.
Veterinary drug premix,Premix for animal,Veterinary premix,Poultry premix feed
NANYANG CHENGPENG PHARMACEUTICAL CO.,LTD , https://www.chppharm.com