How to determine the seeding rate of watermelon seedlings
The seeding rate was determined based on the planting area, seed size (1000-grain weight), seed quality, and seeding method.
In general, seeds are prepared according to an acre (667m2) of 50 to 150 grams. Seedless watermelon has a low germination rate and the amount should not be less than 200 grams.
Live seedlings, 100 grams per acre (667m2), large seeds, the amount of more.
The seedling transplanting method requires about 50 grams of seed per acre (667m2). It depends on the seed size and quality.
Buy watermelon seed notes
According to the local ecological conditions and market demand purchase watermelon varieties.
Check whether the seed size, color, shape, uniformity, and plumpness meet the seed characteristics.
Also pay attention to the seed storage time, watermelon seed storage under normal temperature conditions for 2 to 3 years, do not choose to buy seeds more than 3 years of seed.
Seed treatment before sowing
Before the seedlings of watermelon were sown, the seed treatment mainly included the steps of seed selection, seed drying, seed disinfection, soaking and germination.
The seeds are selected by sieving before seed treatment to remove unfilled seeds.
Drying seeds, before sowing, choose sunny, at 9:00 to 15:00, exposure to the sun for 1 to 2 days, the role is to improve the seed's water absorption and permeability.
Disinfection, usually using wet heat treatment and chemical treatment in two ways.
Wet heat treatment, including soaking in hot water and hot water in two ways.
(1) Soaking with warm soup: soak the seeds in hot water at 55°C (two portions of boiled water for a portion of cold water) and keep stirring. Maintain the water temperature at 55°C for 15 minutes, then allow the water temperature to naturally decrease, and soak for 6-8 hours. This method can kill germs on the seed surface and also inactivate the virus.
(2) Hot-water hot-skinning: When hot-pressing with 75°C hot water, the hot water is poured back and forth until the water temperature is reduced to 55°C, and the stirring is continued until the water temperature is maintained for 7 to 8 minutes. After soaking with warm soup the same.
Medicament treatment is generally performed after soaking, and the following methods are mainly performed.
(1) 50% Carbendazim wettable powder 500 times liquid soaking 1 hour or 40% formaldehyde aqueous solution 100 times liquid soaking 20~30 minutes can prevent anthrax and blight.
(2) Soaking the 2%~4% bleach solution for half an hour can kill bacteria on the seed surface.
(3) Seed soaking with sodium hydroxide, trisodium phosphate, dasammonium, potassium permanganate, copper sulphate, etc. can passivate virus on the seed surface.
Note: The liquid soaking must be strictly controlled concentration and soaking time, the seeds should be soaked in water before soaking for 3 to 4 hours. After soaking the agent, rinse the seeds repeatedly with clean water until there is no smell.
How to germinate watermelon seeds
In the soaking process of warm soup, the seeds should be washed and replaced with water once, and the mucus on the surface should be washed to help the seeds germinate.
After soaking the seeds, remove them and wrap them in a wet towel or gauze, place them at 28~30°C, and pour with 25°C water every 6~8 hours. After 1~2 days, most seeds can be sown when exposed.
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