How to remedy stevia wilting after flooding?

Chrysanthemum spot blight - control methods (1) Choose disease-resistant varieties. (2) The management should be strengthened during the onset period. Watering appropriately, choose sunny days to water in the morning, cloudy days do not water or water less.

3) Apply compost made by enzyme bacteria to avoid over-application of nitrogen fertilizer. (4) The planting density is appropriate, the ditch is cleaned and drained in time, the ventilation and light are transmitted, and the diseased leaves are cut off in time and buried or burned. (5) At the beginning of the disease, spray 400 times of 30 alkaline copper sulfate suspension or 1:

1: 100 times Bordeaux liquid, 80 dimethane wettable powder 500 times solution, 50 thiophanate-methyl suspension 800 times liquid, 75 chlorothalonil wettable powder 600 times liquid, 50 dimonyl wettable agent l 500 times liquid, once every 10-15 days, every 7-10 days for old plants or transferred to reproductive growth, 3-5 times depending on the disease.

This should be the case of rotten roots, generally there is no way, you can only control the amount of watering in the future.

Yes, you should find an agricultural expert to consult him, how to remedy? You can also go to the Internet to search for it, there should be something on the Internet, or you can do it, and you know how to deal with it when you ask.

If you want to remedy the tealot after the last year, you should get more sun and ventilation.

When the chrysanthemum leaves wilt and this phenomenon occurs, it may have "spot blight". First of all, you need to cut off all the diseased leaves. Then spray some chlorothalonil solution every ten days to half a month, a total of three to five times.

Another reason is that the light is too strong or the light is too long, and it is necessary to shade it properly.

1. Disease problem.

1) Specific cause: The most likely is that the plant is diseased. For this plant, it is more susceptible to a disease called "spot blight". From its name we can also tell that it is able to make its leaves withered and devoid of spirit.

2) Solution: The first thing to do, of course, is to cut off all the infected leaves and then concentrate on them. For example, bury it deep or burn it directly.

Then spray some medicine for remedy, such as chlorothalonil solution. The specific frequency is controlled once every ten days to half a month, and a total of three to five times can be relieved. Subsequent conservation management is also very important.

First of all, ventilation, light, and then appropriate watering. Of course, in the long run, you can also choose those disease-resistant varieties to plant, which are not easy to get sick.

2. Lighting problems.

1) Specific reasons: If you want plants to grow healthily, then light must be indispensable. However, if the light is too strong, or if the light is seen for too long, the leaves are likely to wilt.

2) Solution: Observe the position of the plant and whether it is illuminated by strong direct light. If so, then give it proper shading, and it will ease up after a while.

3. Moisture problem.

1) Specific reason: Usually we give it too much water, so that there is stagnant water in the flower soil, which affects its normal absorption of nutrients and causes the leaves to wilt.

2) Solution: The remedy for this situation is, of course, to regulate the amount of water. In addition, it is extremely important to choose a soil with good permeability, and it is also crucial to apply the appropriate trim water-soluble fertilizer.

There are the following reasons for stevia leaves to dry up, and treatment is sufficient.

1. Dry yellow. The yellow of lack of water is different from the yellow of water, the yellow of lack of water is the withering and dry leaf tips or edges, and the old leaves are withered and yellow from the bottom to the top, but the growth of new leaves is relatively normal. Pay attention to watering when watering enough, water thoroughly.

Second, lack of fat yellow.

It is manifested in the color of young leaves becoming lighter, yellow or light green, while old leaves are more normal or gradually turning from green to yellow. It is necessary to check the potting soil frequently, if there is a dry phenomenon, the soil should be changed, and the thin fertilizer should be applied frequently, and some alum water should be poured in a timely manner to supplement iron, or sprayed with some Bika foliar fertilizer.

Third, the lack of light yellow.

If the leaves are shaded for a long time, the leaves will not get enough sunlight to form chlorophyll, and the whole leaves will turn yellow and then fall off, and this disease can be avoided by supplementing light.

Fourth, fat yellow. The yellowing of flowers caused by excessive fertilization or excessive concentration is manifested in dry brown at the top of the new leaves, and the general leaf surface is thick and dull, and the concave and convex are not stretched, and the old leaves are scorched and yellow. Fertilization should be stopped immediately, and part of the fertilizer should be washed with plenty of washing in severe cases.

Fifth, burn yellow. Strong direct sunlight is easy to cause the leaf tips and leaf margins of flowers to wither, and the sunny part of the leaves to appear yellow spots. Move to the pubic area.

Sixth, water yellow. The young leaves are dark yellow and dull, the old leaves have no obvious changes, the branches are small yellow-green, and the new shoots are shrunk and not long, indicating excessive watering. Depot the flowers, put them in a ventilated and cool shade, and dry the soil ball before putting them back into the pot.

Harvesting and processing: The glycosides contained in the leaves of stevia increase with the growth of the plant, and the glycoside content is usually the highest at the budding stage. It can be harvested three times a year in the area south of the Yangtze River, twice in various places along the Yellow River, and only once a year in the northern and northeastern parts of North China and Inner Mongolia.

When harvesting, be sure to choose a sunny day, cut all the plants 15 20 cm from the ground, and the branches harvested on the same day should be spread out while picking leaves, not picking first and then spreading, resulting in accumulation of fever and blackening, affecting the quality. Large-scale planting should be processed and dried by a dryer, and the drying temperature should be controlled at 60 80, so that the moisture content of the leaves does not exceed 10%, and then bundled and packaged after drying. In order to prevent mildew and deterioration and keep it green, it can be put into a plastic bag after drying and sealed with a piercing.

The useful part of stevia is the sweet substance contained in the leaves, that is, acetate glycosomes, which contain 3 glucose molecules in their molecules, which are now collectively referred to as double-flower glycosides, which are commonly known as steviol glycosides, with a molecular formula of C38H60O18. The high-yield of open-field cultivation can harvest about 150 kg of dry leaves per 667 meters2, the leaves contain 7% glycosides 17%, the melting point of sweet glycosides is 196 198, the specific optical rotation, the crude light yellow steviol glycosides can be obtained by alcohol extraction method or water extraction method, and then the white crystalline powder can be obtained through the separation and purification process, that is, steviol glycosides, whose sweetness is 200 300 times that of sucrose.

Stevia leaves are dry because of a lack of moisture and fertilizer.

Apply some potassium fertilizer and water a little water.

When stevia is deficient in nitrogen, the plant growth is inhibited, the plant is weak, the stem and leaf growth is slow, the number of leaves and the leaf area are reduced, the leaves are yellow-green, light and dull, the lower leaves are yellowish first, and the yellowing of the leaves starts from the tip of the leaves, and nitrogen fertilizer is supplemented.

Stevia needs to absorb nitrogen, phosphorus, potassium and trace elements throughout its life to meet the needs of growth and development. Potassium fertilizer is the highest, followed by nitrogen fertilizer and the least phosphate fertilizer.

1. Nitrogen. Stevia is extremely sensitive to nitrogen reactions, and nitrogen** must be in the right amount. Stevia uptakes up to 78% of nitrogen during bud formation and gradually decreases thereafter. When there is too much nitrogen, it will lead to long stems and leaves, elongated internodes, tender growth, thin leaves, easy lodging and serious infection, and premature mildew of lower leaves, resulting in a decrease in leaf yield, air-drying rate and the ratio of leaves to stems and branches, and a decrease in quality.

When stevia is deficient in nitrogen, the growth of the plant is inhibited, the plant is weak, the stem and leaf growth are slow, the number of leaves and the leaf area are reduced, the leaves are yellow-green, light and dull, the lower leaves are yellow first, and the leaves turn yellow from the tip of the leaves.

2. Phosphorus. The phosphorus requirement of stevia is second to that of nitrogen and potassium, and the content in the plant accounts for the weight of dry matter. Phosphorus can promote seed germination and root development, enhance seedling metabolism and stress resistance, and promote flowering, seed setting and seed maturity. Appropriate amount of phosphorus fertilizer was applied in the early growth stage of stevia, and the aboveground and root development could be improved.

When there is too much phosphorus, it will increase the accumulation of inorganic phosphide in the plant, resulting in dysregulation of stevia metabolism and a decrease in leaf yield. When stevia is deficient in phosphorus, the root system of the seedlings is weak, the growth is slow, and the leaves are purple-red. In severe phosphorus deficiency, the leaves turn yellow, and the symptoms are similar to those of yellowing in nitrogen deficiency, and the plant must be measured to determine whether it is nitrogen or phosphorus deficiency.

3. Potassium. Potassium is the most abundant nutrient in stevia, accounting for about the weight of dry matter. Potassium can promote the synthesis and transfer of carbohydrates in stevia, and improve the ability of leaves to continue photosynthesis. In the case of high nitrogen, the addition of potassium fertilizer is more effective than the addition of phosphorus fertilizer to improve the yield of stevia.

When there is too much potassium, it will affect the absorption of molybdenum and magnesium by the plant, and there will also be adverse reactions, such as low air-drying rate of all parts of the plant, and decreased flowering rate and seed yield. When stevia is deficient in potassium, the seedlings grow slowly, the leaves are yellow-green or yellow, and the leaf edges and tips are dry. Potassium deficiency in plants is similar to that in seedlings, and the lower old leaves turn yellow and gradually develop to the middle.

When potassium deficiency is severe, the plant is weak, the roots are poorly developed, and it is easy to lodging.

When it rains and turns black after the stevia is harvested, it is necessary to pay attention to reasonable drainage to prevent root rot.

Before planting in the field, open a ditch and apply some soil miscellaneous fertilizer as base fertilizer. The row spacing of the planted plants is 50 15 cm, and there are about 8000 10000 grasses per mu. After the seedling is 10 cm high, it can be continuously topped and topped to promote multi-branching.

The whole life is long-term, especially the seedling stage of sock foci, and water management should be paid attention to. During the peak growth period, it can be topdressed 2 or 3 times in a timely manner, and combined with cultivating and weeding and soil cultivation. Compound fertilizer is applied half a month before leaf cutting to improve the sweetness of the leaves.

The harvest period of chrysanthemum leaves should be determined according to the climatic conditions of the cultivation site and the cultivation technology. When the bud of the plant appears, it is the time when the leaf contains the highest amount of inulinin and should be harvested in time. When harvesting, it is cut from 20 cm above the ground, and some leaves can be left to protect the overwintering if it overwinters naturally.

Plants that need to be harvested can be treated with short light, that is, in the peak growth period of stevia (90 days after the emergence of seedlings) to start shading, that is, cover at 6 p.m., uncover at 8 o'clock the next morning, and continue to shade for 20 to 25 days, then it can flower and bear fruit. The seeds are very light and can be harvested by wrapping the plant in a plastic bag.

Harvesting and processing usually have the highest glycoside content at the bud stage. It can be harvested three times a year in the south of the Yangtze River, twice along the Yellow River, and once a year in the north. At harvest time, the stems are pruned, the leaves are plucked, and they are dried or dried.

Large-scale planting should be processed and dried with a dryer. 667m2 can produce 150 200kg of dry leaves, the highest up to 500kg.

That's a normal phenomenon, just transplanted roots are underdeveloped and can not absorb nutrients and water in time, as long as the stevia is quickly supplemented with organic matter (amino acids, biological bacteria), so that it can take root!