Why do cauliflower seedlings have yellow leaves?

Hello. In your case, it may be that the seedlings are not neat due to too much watering, and the leaves of the seedlings are yellow.

Cauliflower is a semi-hardy vegetable with strict water requirements. Cauliflower prefers humid environments, is not drought tolerant, and has a weak ability to tolerate waterlogging.

When there is too much water, the permeability of the soil is reduced, the oxygen content decreases, which affects the growth of the root system, and in severe cases, it may cause the plant to wither and yellow. The suitable soil moisture is 70%-80% of the maximum water holding capacity and the relative humidity of the air is 80%-90%. Your substrate is obviously too wet, it is recommended that you water to see dry and wet, watering should not be too frequent, wait for the substrate to dry and water thoroughly, do not water again after the substrate is thorough, and wait for the substrate to dry before watering.

Cauliflower seedlings. At the same time, it is necessary to increase the light time of seedlings and bask in the sun more, but the light intensity should not be too high. In addition, it is advisable to select seeds with high purity and clarity for sowing, and adult seeds can not be used, and seeds with low purity and low bud potential not only have uneven seedlings, but also the yield and quality of flower bulbs will be seriously affected.

Some foliar fertilizers can be used, which have high utilization rate, good effect and fast absorption.

The main reasons for the yellowing of cauliflower rotten roots and curly leaves are as follows:

1.Generally caused by root rot, the disease mainly infects the roots, in the early stage of the disease, the taproot or fibrous root of the plant turns yellow, there is no obvious symptom in the aboveground, and the disease expands significantly in the future, the leaves of the aboveground part droop at noon, and recover in the morning and evening, when the taproot is seriously damaged, the base of the stem atrophies, and after a few days, the root is yellow-brown wet rot, and the aboveground part is wilted and dies.

2.Cauliflower black rot. Symptoms:

The disease can occur from seedling to adult stage. The seedlings become diseased, and the cotyledons are water-stained and die quickly. It occurs at the adult stage, mainly harming the leaves, first from the leaf edge, forming a "V" shaped lesion that expands inward, with yellowish brown and pale yellow edges; The roots are damaged, the vascular bundles turn black, the inside is dry rot, and the whole plant wilts and dies when the disease is severe.

Control methods: seed selection and seed treatment: select disease-free plants to retain seeds; Before sowing, soak seeds in 50 warm water for 20 minutes, or soak seeds with 1000 times of agricultural streptomycin for 2 hours. During the live broadcast, you can use 50% Fumei double according to the weight of the seeds.

Strengthen field management: rotation of severely diseased plots.

Sow seeds in a timely manner, apply enough Bika granular fertilizer, drain water in time after rain, avoid drought and waterlogging, and remove the initial diseased leaves in time, completely remove the diseased residues during harvest, and reduce the source of initial infiltration in the field.

Pharmaceutical prevention and control: timely drug prevention and treatment in the early stage of the disease, can be used 200 10-6 agricultural streptomycin solution, or 100 10-6 neophytomycin solution, or 60% chlorothalonil wettable powder 600 times solution, or 1 1 200 to 1 1 240 times Bordeaux solution, or 77% can kill wettable powder 500 times solution. The above agents can be used alternately to obtain good control effect.

The dry and yellowish edge of the cauliflower may be due to the excessive use of potassium fertilizer during maintenance, resulting in leaf malnutrition, or it may be that the plant receives too much light or lack of water in the process of growth, or it may be that the soil where the cauliflower is planted is compacted, resulting in damage to its roots and unable to provide nutrients for the leaves.

1. Improper fertilization: The edges of cauliflower leaves are dry and yellow, which may be due to improper fertilization. Lack of potassium fertilizer in the leaves will cause yellowing, but a single provision of potassium fertilizer for the plant will lead to an imbalance in the nutrients absorbed by the cauliflower, resulting in the phenomenon of yellowing of the leaves, so in the later maintenance of cauliflower, it is necessary to provide nutritionally balanced nitrogen, phosphorus and potassium mixed fertilizer.

2. The edges of the cauliflower leaves are dry and yellowish due to too strong light, which may also be due to too strong light. Cauliflower is suitable for growing in a sunny environment, but the plant is afraid of the sun, if it is exposed to strong light, it will cause the cauliflower leaves to be burned and yellow, so in the later maintenance, it can only provide full sunshine for the cauliflower in spring and autumn, and can only provide sunshine in the morning in summer.

3. Lack of water: The edges of cauliflower leaves are dry and yellow, which may also be due to lack of moisture. Cauliflower has a greater demand for water in the process of growth, and if there is a long-term lack of water, it will cause the leaves of the plant to turn yellow and dry, so in the later stage of maintenance, it is necessary to provide water for the cauliflower in time when the soil is dry.

4. The soil compaction of the soil for planting cauliflower will cause damage to the roots of the plant and cannot provide nutrients for the leaves, resulting in the phenomenon of dry and yellowing of the leaves, so in the process of later maintenance, it is necessary to loosen the soil for cauliflower every other month to improve the air permeability of the soil. When fertilizing cauliflowers, inorganic fertilizers can also be used in combination with Trim organic fertilizers to avoid soil compaction.

The cauliflower leaf edge is dry and yellow, which may be due to the excessive use of potassium fertilizer during maintenance, and the cauliflower is suitable for growing in a sunny environment, and the cauliflower loosens the soil once to improve the air permeability of the soil. When fertilizing cauliflower, inorganic fertilizer can also be used in combination with well-rotted organic fertilizer to avoid soil compaction.

If the cauliflower is sticky and has a rotten taste, it is not edible. If you use a knife to cut off the surface of the cauliflower to reveal white fresh noodles, it can still be eaten. Cauliflower, or cauliflower, is a cruciferous vegetable that is a variant of cabbage.

The head of cauliflower is a white inflorescence, similar to the head of broccoli. Cauliflower is rich in vitamins B and C. These ingredients are water-soluble and easily lost due to thermal decomposition, so boiled cauliflower should not be cooked at high temperatures and is not suitable for boiling.

The original Mediterranean coast, its product organs are white, short, fat flower buds, flower branches, flower shafts and other polymerization of flower balls, is a kind of crude fiber content is less, the quality is fresh and tender, the nutrition is rich, the flavor is delicious, people like to eat vegetables.

Hello, the yellowing of daylily leaves is due to a lack of magnesium. Daylily lacks magnesium and cannot synthesize chlorophyll, and the leaves will naturally turn yellow, so it is good to supplement magnesium fertilizer. It is best to use magnesium fertilizer along with some foliar fertilizer to increase the nutrients needed by the plant.

Daylily. The role of magnesium fertilizer:

1.Magnesium is a component of plant chlorophyll and phytogen, a metallic element in the chlorophyll molecule, and magnesium plays an important role in photosynthesis. Magnesium ion is an activator of a variety of enzymes, which promotes the conversion and metabolism of sugars in crops, and promotes the synthesis of fats and proteins.

2.Magnesium also promotes the uptake of silicon and phosphorus by crops, which improves crop disease resistance. Magnesium can also promote the formation of vitamin A and vitamin C in crops, thereby improving the quality of fruits, vegetables and other crops.

The yellowing of daylily may be due to lack of water, so timely replenishment of water, proper watering can be, or it may be insufficient nutrients, then it is necessary to apply some nitrogen fertilizer, it is recommended to apply sea and Weihai meal high nitrogen large element water-soluble fertilizer to help daylily grow, alleviate the yellowing phenomenon, if the environment is dark, timely replenishment of light can be, if it is leaf spot disease, spray some Bordeaux liquid.

Since daylily can be harvested for many years, seedling fertilizer must be applied in the later stage, and the earlier the seedling fertilizer is applied, the better. We generally use a mixture of high-efficiency nitrogen fertilizer, phosphate fertilizer and potassium fertilizer for seedling fertilizer.

The daylily leaves are yellow, how can you treat me? Plate anti-leaf yellow medicine.

Hello, pay attention to the prevention and control of leaf spot, which can be prevented and controlled with benzoxystrobin or pyraclostrobin or difenoconazole and other agents. The management of cauliflower should be strengthened on a daily basis.

Cauliflower can be planted in spring and autumn, fertilized before planting, and then planted, after survival, fertilizer and water management is strengthened, and harvested in a timely manner.

1. Cultivation season.

Cauliflower can be cultivated in spring and autumn, spring is generally in mid to late January Yang furrow seedlings, seedling period of 50 days to 60 days, in mid to late March began to plant in the open field, in mid to late May can be harvested. If you sow seeds in autumn, they are usually sown in early to mid-July, planted in the open field in early August, and harvested in mid-to-late October.

2. Land preparation, fertilization and planting.

The growth trend of cauliflower is very strong, so the amount of fertilizer required is also very large, and vegetable farmers must apply sufficient base fertilizer together with land preparation. Under normal circumstances, 5,000 kilograms of high-quality circle fertilizer, 30 to 40 kilograms of superphosphate, 50 kilograms of plant ash, and 5,000 to 1,000 kilograms of dry manure are applied per mu.

After the base fertilizer is paved, it is necessary to carry out deep ploughing and raking, and then level it immediately afterwards to make a wide flat furrow. When the cauliflower seedlings have 5 or 6 true leaves, they should be planted, generally speaking, two rows are planted per mu, the plant spacing is 30 40cm, and the planting density is about 2500 plants per mu. If it is an early-maturing variety, the density can be appropriately increased, and about 3,000 plants per mu is appropriate.

Cauliflower. 3. Fertilizer and water management.

Cauliflower likes fertilizer, so timely topdressing is key, and of course watering is also very important. Top dressing is mainly based on nitrogen fertilizer, and when entering the formation stage of flower bulbs, it is necessary to appropriately increase potassium fertilizer and phosphate fertilizer. It is recommended to use fertile leaf water-soluble fertilizer fertilizer, cauliflower absorption is fast, good management, high absorption and utilization rate, and potassium dihydrogen phosphate can also be used in combination in management, which is conducive to the growth of cauliflower flower bulbs.

The top flower bulb and side flower bulb of cauliflower can be harvested multiple times, but after each harvest, it is necessary to top dressing in time to promote the growth of side flower bulbs.

Cauliflower has a large water demand, and sufficient water is needed for both the rosette stage and the formation period of the flower bulb, so everyone remember to water it in time. However, if it is in a rainy area, it is necessary to drain the water in time to prevent rotten roots.

Fourth, harvesting. Cauliflower is best picked when the flower bulb is fully enlarged and the flower buds are not yet open. Harvest should not be too early or too late. Picking skills, the lower part of the flower bulb can be cut together with about ten centimeters of flower stems.

It is necessary to pay attention to the control of pests and diseases to avoid affecting the quality and yield of cauliflower.

The yellow cabbage leaves may be due to insufficient fertilizer and water.

Compound fertilizer and organic fertilizer can be added. and spray brassinin appropriately.

Brasssin, also known as brassinolide.

It is a new type of plant endogenous hormone, which is recognized as a high-efficiency, broad-spectrum and non-toxic plant growth regulator.

Strong osmosis, fast internal absorption, at very low concentrations, can significantly increase the growth of plant nutrients and promote pollination. It can effectively increase chlorophyll.

content, improve the efficiency of photosynthesis, promote root and seedling growth, flower and fruit preservation; Improve the resistance of crops to cold, drought, salinity and alkali, and significantly reduce the occurrence of diseases; And it can significantly alleviate the occurrence of pesticide damage, make crops quickly resume growth, and can eliminate disease spots.

Brassinolide is a new type of green plant growth regulator, which is treated by soaking with suitable concentration of brassinolide and spraying on stems and leaves. It can promote the growth of vegetables, melons, fruits and other crops, improve quality, increase yield, bright color and thicker leaves. It can also make the leaf picking time of tea earlier, and can also make melons and fruits have higher sugar content, larger individuals, higher yields, and more resistant to storage.

The plant growth regulator on the pesticide market is synthesized sodium nitrate.

and brassin. In practical application, the quality of brassin naturally extracted from the imperial preparation is the best, the comprehensive economic benefits are better, and it can be welcomed and applied by farmers. Zhenshan does not matter which type of plant hormone it belongs to.

It is harmless to humans and animals, and the normal use of doses is very effective.

Natural brassins can be widely used in food crops.

For example, rice, wheat, and potatoes can generally increase the yield by about 10%; It is applied to a variety of cash crops.

If trees, vegetables, strawberries, melons and fruits, cotton and linen.

Flowers, etc., can generally increase the yield by 10 to 20%, and can reach 30% high, and can significantly improve the quality, increase the sugar and fruit weight, and increase the flowery flowers. At the same time, it can also improve the drought resistance and cold resistance of crops, and alleviate the symptoms of crop pests and diseases, pesticide damage, fertilizer damage and frost damage.

It is recognized by the academic community as a class 6 plant hormone. It can be used for field crops, fruits, vegetables, flowers, etc. It has multiple functions such as strong rooting, promoting growth, raising seedlings, strengthening seedlings, protecting seedlings, turning yellow leaves into green leaves, promoting the expansion and early maturity of fruit fruits, reducing diseases and alleviating pesticide damage, coordinating nutritional balance, drought and cold resistance, and enhancing crop stress resistance.

The first aid effect on the phenomenon of dead seedlings, rotten roots and cataplexy caused by heavy stubble, disease, pesticide damage, frost damage and other reasons is significant, and the application is obvious and effective after 12 to 24 hours, and it can quickly recover its vitality. It is suitable for food crops, cash crops, vegetables and fruits, etc., to promote growth, make fruit bulking agent, and increase yield.

The ratio of brassinin to water should be judged according to the concentration of brassin. The concentration of brassin, every 5 to 8 milliliters needs to be mixed with 30 catties of water. The concentration of Yuntai, per 15 ml of brassin, is mixed with 30 catties of water.

Reasonable use can have a better effect. Brassin is a highly effective, non-toxic growth regulator that promotes better plant growth even at low concentrations.

Summary. Hello, dear, the possible reasons for the yellowing of the leaves of the cabbage seedlings are: 1. The cabbage seedlings are too dry and the soil moisture is insufficient. 2. There is too much water in the soil, and the cabbage seedlings turn yellow. 3. The dosage of drugs or fertilizers is too large, causing the cabbage seedlings to turn yellow.

Hello, dear, the possible reasons for the yellowing of the leaves of cabbage seedlings are: 1. The cabbage seedlings are too dry and the soil moisture is insufficient. 2. There is too much water in the soil type, and the cabbage seedlings turn yellow.

3. The dosage of drugs or chemical fertilizers is too large, which causes the cabbage skin to turn yellow.

Cover the film before playing 30m of flubellurona per sprayer.

The same is true for other fields.

Hello, dear, it means that there is some overdose when taking medicine, and you should not spray too much cabbage when taking medicine, and the damage can be slowly alleviated.

Sprayed on the soil, no seedlings were beaten.

Then don't worry about the smile, it is possible that when covering the mulch, the photosynthesis is appropriately weaker than the macro, which causes the chlorophyll synthesis to decrease, and the yellow leaves appear, which will be restored?

The first spray, then the seedlings, other fields also use this no problem.

The soil conditions of the fields in different difficult sections are not exactly the same, there will be slight differences, and there will be slight differences in the degree of absorption of drugs, which is also very combusting.