For what reason cabbage seedlings turn yellow
A particularly important step in growing cabbage is to obtain seedlings. With inappropriate care and in violation of agricultural technology, cabbage seedlings often turn yellow. Consider how to act in such a situation.
Causes of yellowed cabbage seedlings
Most often, cabbage seedlings turn yellow if poor-quality seed material is used. It may be infected with diseases. Cabbage seedlings very often also turn yellow due to the introduction of a substrate with pathogens into the soil.
- Lack of moisture or waterlogging. With a moisture deficit, the plant does not receive enough nutrients from the soil, and growth slows down. Excess watering leads to the formation of a dense crust in the soil. It interferes with the access of oxygen to the root system. This leads to rotting of the root and the appearance of yellow leaves.
- Inappropriate seed treatment. For cabbage crops, an important element of cultivation is seed hardening. It is carried out to ensure the resistance of the plant to various diseases.
- Lack of nitrogen and potassium. Due to a deficiency of nitrogen and potassium in the soil, the vegetable crop stops growing, and a yellow tint appears on the leaves.
- Dates of disembarkation. Shoots are planted in open ground when the cabbage has 3-4 true leaves. The height of the plant is not less than 10 cm. The approximate planting time is May or June, the age of the seedlings is 40-45 days.
- Soil selection. If you select an unfavorable soil, the seedlings will begin to wither and change color. It should be with enough fertilizer, ash and sand.
- Temperature and location. Leaving a container with seedlings in a place where direct sunlight and ventilation is not carried out is not recommended. If you leave pots with shoots in a room with a high temperature, then they will stretch out very much, and the root system will not have time to develop. This leads not only to yellowing seedlings, but also to the death of the whole plant.
With inappropriate watering, the lower leaves begin to turn yellow, and eventually the whole plant. The treatment of seedlings is necessary only after determining the root cause.
How to fix the problem
If the seedlings of cabbage turn yellow, you need to act immediately. Timely action can save the plant.
|room||Agrotechnical event||Mode of application|
|one||Watering||Abundant watering is required. It is recommended to moisten the soil 2-3 times a day. Make sure that the earth does not turn sour due to waterlogging.|
|2||Mulching||Keeps the soil in a friable state, weeds grow less often. Sawdust and bark, with a layer of 2-7 cm, are suitable for mulch. They protect the soil from leaching of nutrients and weathering - peat and compost.|
|3||Temperature and light||After germination, cabbage seedlings need a place with a temperature of 8 ° C to 12 ° C for 7-13 days.|
Cabbage is a very photophilous plant, so it needs bright lighting in the seedling period.
|four||Open transplant||Cabbage seedlings turn yellow in case of non-compliance with the rules for planting in a permanent place. If only the lower leaves have turned yellow, do not worry. But if the whole plant has changed color, then nitrogen fertilizers should be applied.|
In order for the plants to take root in the open ground faster, it is recommended to choose the soil on which cucumbers, carrots and tomatoes grew. You need to plant according to the scheme: in a row through 25-30 cm, between rows 35-40 cm.
Cabbage seedlings turn yellow with an insufficient number of top dressings, both foliar and root. Top dressing should be moderate. It is necessary to process not only the lower leaves, but also the soil in which the vegetable crop is grown. Fertilizers with organic or mineral nitrogen fertilizers must be applied only in the spring or in June. To do this, use ammonium nitrate, contains 34% of the available nitrogen. 4 g of the substance are mixed with 1 liter of water. You can also add 4 g of superphosphate and 1 g of potassium chloride to the solution, but at the same time reduce the weight of ammonium nitrate to 2.5 g. Add this mixture to the soil, one week after the pick.
Seedlings may turn yellow due to the lack of trace elements in the soil: phosphorus, iron, potassium. A few days before planting in open ground, broccoli, white cabbage and cauliflower are fertilized with a complex of feeds. To do this, mix: 2 g of potassium chloride, 7 g of superphosphate and 4 g of ammonium nitrate per liter. Wood ash and lime are added to the soil for the resistance of the vegetable crop to weather conditions.
To preserve moisture and a sufficient number of useful elements in the soil, mullein infusion is used. To do this, you need to insist 0.5 liters of substance in 10 liters. water for 2-3 hours.
Cabbage Seedling Disease
Cabbage is hard to cure
Young plants are most often exposed to various diseases. When symptoms are identified, prophylaxis or appropriate agronomic measures should be taken.
|room||Disease||Ways to fight diseases|
|one||Blackleg||A sign is the blackening of the stem and the root neck, which leads to a change in the color of the leaves and the death of the entire bush. For prevention, use loosening and mulch. Sprinkle the topsoil with ash, lime. The weakest plants must be removed.|
|2||Kila||It acts as a growth on the root. Appear due to increased soil moisture, late seed planting and high soil acidity. Sick plant can not be cured, they are removed. The soil is disinfected with a solution of potassium permanganate. The mixture is prepared from 10 liters of water and 5 g of substance.|
|3||Fusarium||Appears due to the small amount of moisture and due to hot days. Affected plants are immediately dug up along with the roots and destroyed. The soil is disarmed with a mixture of copper sulfate. To increase the plant's resistance to fusarium, the bush is treated with Agat-25, Immunocytophyte preparations.|
Most of the diseases of seedlings cannot be treated, therefore, preventive agricultural measures and hardening should be carried out before planting seeds and during growing seedlings.
If the cabbage leaves begin to curl, dry out and turn yellow, then this may be a sign of pests:
- cruciferous flea;
- spider mite;
- cabbage moth;
In the fight against spider mites, the leaves are washed under running water and sprinkled with a thin layer of wood ash or tobacco dust. Using a soap solution, a mixture of iodine with milk or tomato tops, you can get rid of cabbage aphids. Against moths use spraying with wood ash.
Cruciferous fleas are afraid of a solution of vinegar, chicken droppings or celandine. And slugs and snails of mustard powder, infusions of garlic or onions.
|one||Soap solution||It is necessary to mix 1 liter of water and 4-5 tablespoons of liquid soap or detergent.|
|2||A mixture of iodine with milk||To do this, use 1 liter of milk, 9 liters of water and 10 drops of 5% iodine.|
|3||Tomato Tops||4 kg of tops are chopped and filled with 10 liters of water. Bring the mixture to a boil, stand for 5 hours and filter. 50 ml of liquid laundry soap is added to the solution. And dilute 1 liter of solution with 3 liters of water.|
|four||Onion infusion||300 g of onion pour 2 l of boiling water and leave for 24 hours. Filter, add 30 ml of liquid soap and 10 l of water.|
Pests adversely affect plant growth and the appearance of fruits. Therefore, when identifying insects, immediate preventive measures should be taken.
Almost every stressful situation caused by a violation of the rules of care causes yellowing of the leaves, especially in its lower part. Therefore, in such cases, you need to figure out what could cause the stress of the vegetable crop, and then take the necessary measures.