Since the beginning of spring, the seedlings of some nursery trees in Wuqiao County have experienced yellowing in different degrees. According to the survey, the soil is heavy and the nursery with chemical fertilizers is the most serious; the land with high salinity is heavy; the planting density is high or the weak trees under the large seedlings are heavy; the poplar tree seedlings, willows Rapid propagation and retention of bed seedlings are serious. In addition, in the surrounding areas of heavily polluting enterprises, some tree species also exhibit a certain degree of yellowing, and even die. There is a yellow soil that appears to have good soil and fertilizer conditions and a large-scale nursery.
There are many reasons for the yellowing of seedlings. To the actual situation, there are mainly the following aspects:
1. It is related to the high pH of the soil. The higher the pH is, the greater the alkalinity of the soil is, and the iron in the soil is converted into insoluble iron that cannot be absorbed by the root system under alkaline conditions. For example, iron oxide or iron hydroxide precipitates, the solubility of iron decreases, and the soil is then reduced. The analysis did not show iron deficiency, but the iron in the soil could not be used by plants but became invalid iron. The inorganic iron fertilizer applied to the soil will eventually be converted into iron hydroxide due to oxidation and soil alkalinity, making it difficult for crops to absorb and use. Therefore, seedlings growing on saline soil have potential iron deficiency and are prone to iron deficiency chlorosis. When the pH is greater than 8, the symptoms of yellowing become more pronounced.
2. It is related to improper cultivation and management. The ability of seedlings to resist yellowing is closely related to the comprehensive cultivation and management of seedlings. The cultivation and management level is higher, the fertilizer and water are managed properly, and the yellowing phenomenon is lighter. Plants with high planting densities or other causes of insufficient light in the previous year may also affect the production of photosynthetic products, resulting in less nutrient accumulation in the tree, poor root development, weakened absorption capacity, and poor tree vigour. Once the management of fertilizer and water can not make up for nutrients. Deficiency is also prone to yellowing.
3. It is related to the impact of weather conditions. In Wuqiao County, there was too much precipitation in summer last year, and some of the roots of the trees rose. It was a matter of drought in April of this year, and the absorption of roots was reduced, which affected the absorption of iron and other nutrients and caused yellowing.
4. It is related to the lack of iron in the soil. The lack of iron in the soil caused iron deficiency in plants.
In normal years, yellowing in the nursery emerged in May-June, and the method of spraying ferrous sulfate or chelating iron can solve the problem. This year, the incidence of the nursery early to the germination period in April reflects that not only is the soil The lack of effective iron, as well as the problem of weakened root absorption capacity, can be easily mitigated without simply supplementing iron, and comprehensive measures need to be taken to treat it:
1. For high-pH soil gardens, we must pay attention to soil improvement in nurseries, increase the quality of decomposed organic fertilizer, deepen the soil, reduce the alkalinity of the soil, prevent soil salinization and excessive stickiness, and release the soil Fixed iron element in the middle. Human fecal urine is rich in nitrogen (0.5%-0.8%), phosphorus (0.2%-0.4%), potassium (0.2%-0.3%) and other nutrients, and human fecal urine after top dressing is not only quickly able to be plant Absorb, promote the growth and development of the tree, but also to improve the role of the soil.
2. Iron fertilizer should be applied to nursery sites that lack iron. According to the size of the seedling plant, a deep groove of 30-40 cm in depth and 30 cm in width (one turn in width) near the root end is used to uniformly mix 1-2 kilograms of trace element fertilizer containing iron fertilizer with high-quality decomposed organic fertilizer and bury it in the ditch. Medium, then water. Foliar can also be sprayed with 0.2% ferrous sulfate solution, spraying once every 7-10 days, continuous spray 3-4 times. In order to enhance the absorption of iron by the leaves, a small amount of vinegar and 0.3% of urea can be added when spraying ferrous sulfate, which can promote the absorption of iron by the leaves. What needs to be noticed is that the time for spraying iron fertilizers on leaves is generally chosen to be after 4 o'clock in the clear and windless afternoon. After the spraying, the rain should be sprayed again after fine weather. Inorganic iron fertilizer with the spray with the fertilizer solution should not be long home in order to prevent oxidation failure. Concentration is best not to exceed 0.3%, otherwise it is easy to produce fertilizer, causing Jiao Ye phenomenon. The iron-deficient area should be continuously sprayed with iron fertilizer for several years until iron deficiency disease no longer occurs. In addition, in the nursery where the iron deficiency yellows are very serious, the roots of the seedlings can be split open to expose several thicker roots, and a small knife is used to cut a few pieces of skin of the size of a fingernail with a knife and then smeared with 2.5% of ferrous sulfate and Cake fat fermentation broth.
3. Improve the cultivation and management level of the nursery. By increasing the quality of organic fertilizer, rational application of fertilizers, and strengthening the management of fertilizers and water, the plants are given adequate nutrition. To root up, it is necessary to guide roots downwards through measures such as cultivating. For plant yellowing caused by water damage, lower groundwater level or deep plowing, reduce soil moisture, ensure normal root growth and normal nutrient absorption.
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[Name] Medical Cold Patch
[Package Dimension] 5cm 4pieces/box
The pain relief patch is composed of three layers, namely, backing lining, middle gel and protective film. It is free from pharmacological, immunological or metabolic ingredients.
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[Indications]
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[How To Use a Patch]
Please follow the Schematic Diagram. One piece, one time.
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[Attention]
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[Storage Conditions]
Store below 30c in a dry place away from heat and direct sunlight.
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