Unusual growth of vegetable seedlings
The nursery is the key link in the production of vegetables. After sowing, the most worried about vegetable growers is the emergence of abnormal seedlings, which not only wastes seeds but also delays farming time. The causes of the abnormal seedlings and their rescue methods are as follows:
First, emergence or emergence of seedlings rarely causes
1. The seeds have lost their germination rate;
2, the ground temperature, the climate is too high or too low, seedbed ventilation and poor light, bed soil water content is too high or too low, bed soil fertilizer is too much, cover soil thick.
Rescue method:
1. Do germination test and seed disinfection;
2. If the seed buds are dead, they should be sowed immediately; if bed soil is infected with pathogens, they should be changed to bed and then sowed;
3. If the seed germination rate is high at the time of sowing and the germination potential is detected in the soil, the obstacles must be removed by improving the environmental conditions.
Second, the seedlings are not homogeneous and the interval is long.
1. The temperature is not uniform, the bed surface is uneven, and the cover soil varies in thickness;
2. The seed germination potential is not good; the maturity is inconsistent; the storage process is partially damp and the new seeds are mixed;
3. The seedbed leaks rain, and the underground pests are partially damaged. The chemical fertilizer mixed in the bed soil is uneven.
Rescue method:
1, to create a good nursery conditions, bed as flat as possible, bed fine and disinfection sterilization;
2. Make germination test before sowing so as to avoid mixing new seeds;
3, the membrane should be tight, leaving a small gap, mixed seeds before sowing treatment, bed soil organic fertilizer and fertilizer should mix well.
Third, the "top cover" is now "with a cap" seedlings cause
1. Before the seeding, the bottom water is too little, and the humidity on the surface is not enough. After the germination, the mucus between the seed coat embryos is sucked dry by the surface soil and loses the lubrication effect. The seedlings and shells extend out of the ground;
2, too thin soil, pressure is not enough, "with a cap" out;
3. The seeds are not full, there are incomplete and damaged, or the storage period is long, the sprouting power is poor, and it is not easy to be broken by the seed coat, so that the “top cover†is unearthed.
Rescue method:
1. Sprinkle some water in the morning with a watering can or sprinkle with moist fine soil;
2, as far as possible with new seeds or seeds with high germination rate; 3, artificially opened seed coat.
Fourth, the cause of foot seedlings
1, large amount of seeding;
2, bed temperature is too high after emergence. Rescue method:
1, diluted sowing, early seedlings, Qi Miao immediately cooling;
2, young seedlings can be sprayed with 50 ~ 100 mg / kg of Chlormequat seedlings.
Fifth, the old seedlings cause the seedlings to grow too long, take a long time at low temperatures, and cause drought in the soil. Rescue method: seedling age should be appropriate, seedlings should be moderate; hardening seedlings, low temperature for a long time; can not rely on water control seedlings to prevent prolonged drought caused by seedling aging, seedlings should be controlled temperature not control water.
VI. Reasons for the emergence of seedlings After a sudden overcast day after a sudden cloudy day, all the cover materials will be opened. Rescue method:
1. After a sudden turn of sunshine, it is not possible to fully expose the cover and expose it for a while.
2. If the wilting is found soon after the exposing of the larvae, it shall be immediately covered and the larvae shall be re-opened after the seedlings return to normal. Do not water.
VII. The cause of drug injury is excessive, the concentration is too high, and the seedbed is too dry. Rescue method: Strictly grasp the medication and drug concentration, the application should be uniform. For the seedbed of the medication, pour more water before sowing to keep the soil moist. If any harm is found, the water should be sprayed in time to dilute the concentration of the drug. It is also possible to divide the seedlings in advance so that the seedlings can leave the original seedbed to ease the injury.
VIII. Causes of cold root seedlings The temperature of the seedbed is too low to cause frostbite in the roots.
Rescue method:
1. Raise the temperature of the bed, prevent it mainly, and lay a hotline under the seedbed;
2, increase the greenhouse temperature, it can also promote the temperature rise.
Nine, root cause of seedlings seedbed soil moisture is often saturated, excessive humidity, lack of air.
Rescue method:
1. Control the watering amount of seedbed;
2, prevent flood irrigation. Once roots occur, they should be promptly ventilated and drained;
3, increase the evaporation;
4, withdraw dry soil moisture;
5. Diligently cultivate the soil and increase the permeability.
X. Causes of burning root seedlings There are too many fertilizers in the seedbed and the concentration of soil solution is too high. Normal soil solution concentration exceeds 0.5% will burn roots. Rescue method: The amount of fertilizer applied to the seedbed should be appropriate, and the organic fertilizer should be applied and the concentration of fertilizer should be strictly controlled. In the event of burning roots, watering is appropriate to reduce the concentration of soil fertilizer.
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