What causes cucumber leaves to be gilded ? What can be remedied?

If the upper leaves of cucumbers cause "gold edges", most of them are specific manifestations of potassium deficiency or too much zinc. Cucumbers like water and fertilizer, farmers generally pay attention to nitrogen, phosphorus and potassium fertilizers to make up, but there are also some people who are greedy and cheap to buy some substandard fertilizers resulting in potassium deficiency in cucumbers. If too much potash is used, the overproduction of zinc will also lead to gilded upper leaves.

Cucumber golden-edged leaves, that is to say, when cucumbers are "gold-edged", the visible tissues of the injured leaves generally do not produce necrotic symptoms.

This is different from the physiological withered leaves of cucumbers in sheds due to air circulation. When the golden-edged leaves of the cucumber in the shed are produced due to the lack of calcium, the upper leaves of the green plants will suddenly become smaller and the bud points will be tightened. Cucumber golden-edged leaves generally show symptoms in a period of time after the cucumber is planted in the shed and before harvesting.

The cause of cucumber golden-edged leaves is similar to that caused by cucumber gliding leaves, which is another expression of calcium deficiency in cucumber green plants. Although it is said that cucumber golden-edged leaves with a lack of calcium are directly logical order, <>

However, the direct causes of real accountability are related to soil stratification, drought, deashing, the use of too many chemical fertilizers, or boron deficiency in green plants. The soil stratification pH is large, and calcium fertilizer is not applied for many years; In the squatting stage, under the concept of moderate control of fertilizer liquid, it has entered extremism and delayed irrigation. Under the condition of low water holding capacity in the field and high soil solution concentration, the absorption and digestion of calcium by cucumber green plants was hindered. After too much application of chemical fertilizers, the content of nitrogen, magnesium and potassium in soil stratification is too high, which will inhibit the absorption and digestion of calcium by cucumber green plants. In the case of soil stratification acidity, the absorption and digestion of boron by cucumber green plants is hindered and <>

It will also trigger the absorption and digestion of calcium, resulting in a lack of calcium in cucumber green plants. The above various factors lead to a lack of calcium in cucumbers, all of which will lead to the killing symptoms of cucumber leaves "gilded with gold edges". The use of too much ammonium nitrogen can also lead to a range of other psychological problems.

For example, the leaf surface is dark, the petiole is protruding, and the leaf stem is relatively concave; The leaf edge is rolled downward, and the leaf surface becomes significantly smaller;The root color is rusty, and when it is more serious, it produces rotten roots and fallen seedlings. Therefore, the application of nitrate nitrogen in cucumber is a specific preventive measure to prevent physiological diseases and ensure good growth and development.

In the future, when the foliar edge of cucumber turns yellow, the foliar spray of phosphorus nitrate fertilizer solution or calcium chloride solution 2 3 times can effectively and efficiently change the root cause of yellowing of cucumber foliar edge.

1. Cause analysis.

In addition to the pesticide damage, gas damage, cucumber leaves appear inlaid with gold edges, mainly unreasonable fertilization, resulting in soil salinization, to the current vegetable farmers' fertilizer habits, mainly caused by excessive potassium or nitrogen, excess nitrogen and potassium in the soil can not be absorbed and utilized, accumulated in the soil for a long time, resulting in too high soil salt concentration, first, the root system absorbs a large number of high concentration of soil solution, will burn the edge of the leaf and turn yellow, second, the potassium content is too high will produce antagonistic effect, inhibiting the absorption of other trace elements, such as calcium, boron, Lack of iron and other elements causes cucumber leaves to yellow edges.

2. Preventive measures.

Rational fertilization of chemical fertilizers:

Balanced fertilization during the growth of cucumbers, alternating use of high potassium type and balanced type, and choose water-soluble fertilizers with high nutrient content and high absorption and utilization rate, do not blindly increase the application rate, and avoid excessive soil nitrogen and potassium content and soil salinization. At the same time, combined with foliar spraying, medium and trace element foliar fertilizer, preferably chelated, high absorption and utilization rate, to avoid the deficiency of calcium, zinc, iron and other elements. In addition, it is best to combine flushing and spraying during winter topdressing, which is more conducive to the absorption of nutrients by plants, improves plant growth, and delays root and leaf senescence.

This is mainly due to a lack of water in the soil, or due to the accumulation of salt in the soil, or possibly due to a lack of potassium. It should be solved with the appropriate fertilizer, or it is symptomatic**, or it can also be sprayed.

It is caused by the lack of oxygen, and it is necessary to pay attention to watering, fertilization, and spraying pesticides on time, so that it can be better remedied.

Summary. Expansion: Although it is not a big problem to say that cucumber leaves are inlaid with gold edges, from the reasons for this situation, there is a great hidden danger to the growth of cucumbers.

Therefore, after discovering the first edge of cucumber, it is necessary to analyze the cause in time and strengthen prevention and control to avoid more serious problems.

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Hello, I am glad to answer for you: the reason for the appearance of ** edge in the leaves of cucumbers: the first is due to the lack or excess of potassium and lead.

Second, the high concentration of soil solution and the saline loss are also the causes of yellow edge. Third, calcium deficiency leads to yellowing of leaf margins. Fourth, drug damage and gas damage can lead to yellow edges.

Expansion: Although it is not a big problem to say that the cucumber leaves are inlaid with gold edges, from the perspective of the reason for the banquet that caused this situation, there is a great hidden danger to the cucumber brigade commander. Therefore, after discovering the first edge of cucumber, it is necessary to analyze the cause of the original oak stool in time and strengthen the prevention and control to avoid more serious problems.

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Cucumber leaves are gilded because of the excessive ammonium nitrogen in the soil, which hinders the absorption of calcium by cucumbers.

1. Causes:

1. High soil concentration. In the seedling stage, the management requires moderate control of watering, and some vegetable farmers emphasize this point too much and delay watering, so that the soil moisture is less, the concentration of soil solution increases, and the absorption of calcium by plants is blocked, resulting in calcium deficiency.

2. The soil acidity is strong or calcium fertilizer is not applied for many years.

3. The content of nitrogen, magnesium and potassium in the soil is too high, which inhibits the absorption of calcium by plants.

4. Under the condition that the soil is alkaline, the obstruction of boron absorption by plants will induce the obstruction of calcium absorption, resulting in calcium deficiency.

Second, the prevention and control methods:

1. If this calcium deficiency symptom occurs, as long as the soil concentration is reduced by watering, the new leaves that will grow in the future will not appear Phnom Penh. However, calcium deficiency symptoms can also occur when the low ground temperature in winter affects the normal absorption of calcium by the roots. However, when the weather returns to normal and the temperature rises, the symptoms of calcium deficiency will disappear naturally, but the Phnom Penh that has already appeared will not disappear.

2. Apply an appropriate amount of lime on sandy or acidic soil.

There are many conditions that can cause yellowing of cucumber leaf edges, some occur in the middle and lower leaves, some occur in the new leaves, and some occur in the middle and upper young leaves. But whatever the cause, it's a physiological disease.

The first is due to a deficiency or excess of potassium. Yellowing of leaf edges caused by potassium deficiency or potassium excess, mostly occurs on the middle and lower leaves. Potassium deficiency is rare, and yellow fringes caused by excessive potassium are the most common.

Because cucumber is a fertilizer-loving crop, the amount of fertilizer is very large, so there is generally no yellow edge caused by potassium deficiency. Therefore, most of the causes of yellow fringes are caused by excessive potassium.

Second, the high concentration of soil solution and salinization are also the causes of yellow edges. This situation often leads to the yellowing of cucumbers from the bottom up. The data show that cucumber absorbs nitrate nitrogen quickly, and the absorption of ammonium nitrogen and amide nitrogen is not as good as nitrate nitrogen, while vegetable farmers use mostly ammonium nitrogen, and a large amount of ammonium nitrogen cannot be converted into nitrate nitrogen by soil microorganisms after being applied to the soil, and the accumulation in the soil directly leads to the high concentration of soil solution.

The high content of nitrogen and potassium ions in the soil leads to soil salinization, which inhibits the movement of various elements in the soil, and the high salt concentration will cause the root cells to undergo plasma wall separation, which greatly inhibits the absorption of other trace elements, such as boron, iron, etc., and is also easy to cause leaf yellowing.

Third, calcium deficiency leads to yellowing of leaf margins. The yellow edge caused by calcium deficiency mostly occurs in the young part of the plant, and generally the yellow edge of the young leaf appears more uniformly, and in severe cases, it will expand inward. Due to soil drought or overwatering, cucumber roots are injured, affecting the absorption of calcium by the roots.

Due to the large application of chemical fertilizers, the concentration of soil solution increases, which inhibits the movement of calcium, and the content of nitrogen and potassium in the soil is too high, which plays an antagonistic role in calcium and reduces calcium absorption.

Fourth, drug damage and gas damage can lead to yellow edges. In this case, the middle and lower leaves are mostly damaged, and the leaf margins turn yellow at the beginning and scorch at the later stage. Due to the frequent occurrence of diseases in winter, in order to prevent diseases, many vegetable farmers basically spray pesticides every few days to prevent them.

If a disease occurs, the number of spraying increases significantly, and some take fumigation measures to prevent the humidity in the shed from increasing. If applied for a long time or at a high rate, it will cause the edges of the leaves to turn yellow. A lot of harmful gases will be produced in the process of top dressing and fumigation, and if it is not ventilated in time, it will cause the leaves to be Phnom Penh.

Although it is not a big problem to say that cucumber leaves are inlaid with gold edges, from the perspective of the reasons for this situation, there is a great hidden danger to the growth of cucumbers. Therefore, after finding that the cucumber has yellow edges, it is necessary to analyze the reasons in time and strengthen prevention and control to avoid more serious problems.