Seed treatment
1. Infiltration: 24 hours of immersion of seeds in warm water, which swells the seeds and increases the rate of growth。
2 sterilization: seeds are immersed in potassium permanganate solution around 50 mg/l, disinfected for 30 minutes and washed with clean water。
Ii. Shrimp breeding techniques
Seeding: the seed cover thickness should not be more than twice the size of the seed and should remain wet in the nursery。
Temperature: controlling the temperature of the seeding period at 20-25°c to avoid adverse effects on the growth of the seedlings at low or excessive temperatures。
3. Light: in the nursery bed, the top of the seed is to be exposed in order to receive direct sunlight. Seeding is usually done in a near-dark environment, and the seedlings begin to maintain a longer-term high-level light (see also below). More than 12 hours) to increase the intensity of light, which promotes the growth of seedlings。
4. Humidity: should be appropriate but not excessive. The first two days of general new sowing are artificially sprayed to control 2-3 times per day; the subsequent stages of the valves are automatically adjusted to maintain more than 50 per cent humidity, and once the seedlings fall, they can gradually reduce the amount and frequency of the spray and maintain the water in the soil and air。
Ventilation: control of vents is generally used to regulate indoor air flow to ensure fresh air and proper current exchange in seedbeds, taking into account temperature and humidity control and reducing the occurrence of pests and diseases。
Water: water should not be over- or under-watered during the seeding season, preferably by commuting every day. If the soil surface is dry, the water needs to be replenished in a timely manner。
Iii. Transfer technology
Location: the choice is to use well-drained, fertile and soft corroded soil, before planting, until the soil is stabilized。
2. Plug-in: a small amount of corroded organic fertilizer is mixed to root the roots at the bottom of the fertilizer. The depth of each type of penetration is measured by the depth of seed cultivation, the roots are in close contact with the soil, avoiding air entry, the cultivation of a full, balanced gap, the thickness of the ground is moderate, and water is quickly distributed slowly in order to absorb the slowness of the eyelid, with root agents being used if the roots are damaged during transplantation。
3. Light: more shade and moistness are needed after planting, which cannot be exposed to sunlight and direct wind, using sunlight inhaled light and a small millimetre microscope to observe minor changes very clearly and clearly。
4. Humidity: select the appropriate humidity to keep it in its proper state, in accordance with weather conditions and the moisture of the blade surface, and maintain it by controlling vents, watering, etc., before planting。
5. Water: the number and quantity of water must not be overstretched in order to avoid immersion and disease. Soil moisture is generally maintained at around 70 per cent, and water is reduced when conditions stabilize。
Fertilizers: a water soluble fertilizer is applied once in 10-15 days after seeding, with a ratio of 2:1 nitrogen and phosphorus fertilizer, or approximately 10 kg per acre. It is then applied on a continuous basis every 10 days, taking care of winter fertilizer, controlling nitrogen fertilizer and increasing phosphorus fertilizer to improve the stability of production and quality。
