The melon leaves are yellow, is it caused by rain every day, can it be fertilized?

There are many reasons for the yellowing of melon leaves, and the air humidity is high due to long-term rain, but on the one hand, it is necessary to find out the reasons and adjust them.

1. Lack of nutrients.

Reason: If the veins of the old leaves of the melon are yellow, it may be related to the lack of nutrients, and the nutrients are not supplied, which will affect the growth of the plant and cause the leaves to gradually turn yellow.

Solution: If this is the reason, it should be topdressed in time to ensure the supply of nutrients, and usually spray Bika amino acid foliar fertilizer, although the yellowed leaves can no longer turn green, but can inhibit the plant leaves from continuing to turn yellow.

Second, the impact of disease.

Reason: The leaves of the melon turn yellow, which may be infected with bacterial leaf blight, after this disease infection, it will cause the leaves to turn yellow, and it will also affect the growth of the plant, and in the later stage, the symptoms will become more and more obvious.

Solution: After the general infection of the disease, the diffusion is very strong, it is easy to infect other plants, after the onset of the disease, the diseased branches and leaves will be cut off, and then sprayed with drugs.

I can't rule out that there are reasons for this.

Muskmelon, another name for melon, is the fruit of the Cucurbitaceae climbing or creeping herbaceous plant melon. It is one of the top 10 fruits in the world, with genetic polymorphisms, and rich variation types in fruit size, shape, peel and pulp color.

Growing conditions. Thick-skinned melons are intolerant of high soil and air humidity and require sufficient sunlight and high temperatures (especially during the fruiting period), as well as large temperature differences between day and night. The whole growth period of medium and late maturing varieties requires an accumulated temperature of more than 15 and 3000-4000.

Warm and warm. The optimal temperature for growth is 25-30. Even when the temperature is as high as 40 and the photosynthesis of other crops has been disturbed, the photosynthetic efficiency of melons is still maintained at a very high level; At this time, the photosynthetic products of the leaves are three times more than that of the heat-tolerant crop watermelon.

Turpan (formerly known as Huozhou) in the special production area of cantaloupe, the average temperature in July reached, and the highest temperature on the ground was often nearly 50.

Hi-light. Sunlight is required to be strong and sufficient. The light saturation point is 10,000 lx.

13-14 hours of sunlight per day can speed up growth and promote early maturity; Less than 10 hours of sunshine has had an adverse effect on thick-skinned melons, and late-maturing varieties require 1700-1800 hours of sunshine during the whole growth period. The average annual sunshine rate (actual sunshine hours and possible sunshine hours) in northwest China is as high as 70%-80%, rarely cloudy and rainy, often clear skies, scorching sun, so that the region has sufficient heat and light.

Temperature difference between day and night. Melons are products made from fruits that are high in sugar. The large temperature difference between day and night is very conducive to the accumulation of sugar: during the day, there are many photosynthetic products due to high temperature and scorching sun; Low temperature at night, less respiratory consumption.

1.Plants lack nitrogen, the old leaves first begin to turn yellow, and then gradually turn yellow from the bottom up, timely supplement urea, ammonium bicarbonate, ammonium sulfate and other nitrogen fertilizers from the roots or leaves, or import high-nitrogen water-soluble fertilizers, you can promote the leaves to turn green.

2.Crops lack phosphorus, the whole plant will turn dark green, and no luster, the leaves will also turn yellow, timely supplement of superphosphate and other phosphorus fertilizers, can promote the leaf to restore luster.

3.Crops, fruit trees, vegetables and flowers are deficient in potassium, the leaves will be uneven, and the edges of the leaves may also turn yellow and withered.

4.Plant iron deficiency, young leaves and old leaves at the same time yellowing, young leaves of the mesophyll yellow, leaf veins green, the formation of a network of yellow leaves, generally watered ferrous sulfate, but the concentration should not be too large, can be applied in stages, to avoid burning roots.

5.Crops lack calcium, young leaves turn yellow and curl, can be applied to crushed egg shells or Ribery Yanwo imported chelated calcium and magnesium fertilizer to reduce the harm.

6.Plants are deficient in magnesium, the leaves turn green and yellow, and finally dry up and die, and calcium, magnesium, phosphorus, and magnesium sulfate fertilizers are applied in time.

7.Crops are deficient in sulfur, leaf veins are yellow, and ammonium sulfate is applied in time to promote the leaves to turn green.

8.In strong alkaline soils, yellowing of leaves will also occur, and acidic fertilizers such as rice washing water and ferrous sulfate can be applied to change the soil environment.

9.Overwatering or stagnant water, the young leaves of the plant turn yellow, excessive drought, the old leaves begin to turn yellow, gradually aggravated from the bottom up, and even the whole plant dies, adjusting the soil moisture can be effectively remedied.

10.Too much fertilization or too short interval time will cause fertilizer damage, and the young leaves will be uneven, but the leaves are thick and shiny, and the symptoms can be alleviated by controlling fertilizer watering and cultivating loose soil.

This symptom is wilt (also known as bacterial wilt, root rot), the main symptom is leaf wilting, roots, stems turn black and brown and die; It needs to be prevented and treated in time, or it will be difficult to save the rotten roots in a few days. Operation method: Use 100 billion grams of Bacillus subtilis, which can be dissolved in water and absorbed relatively completely, and then irrigate the roots, 100 grams can be used on an acre of land.

The weather has been hot. Isn't there less watering, is it?

In high temperatures and droughts, the leaf stomata will close due to the self-protection of the leaves.

Wait a few more days to see, if it is still like this, spray the foliar with some trace elements iron, boron and zinc, add a little sodium nitrate, and spray the foliar to see.

The melon leaves have yellow spots, then turn yellow and dry up. This is made up of:"Melon leaf blight"Be caused by.

At the beginning of the disease, small yellowish spots are produced on the leaves, which then expand into round to oval brown lesions, **grayish-white, dark brown to purple-brown at the edges, slightly raised, and oily on the outer edges. In the later stage, there is a sparse mold layer in the middle of the stage. The size of the lesions is about the same, the number of spots on the diseased leaves is very large, and there are often more than 300 lesions on a leaf.

In severe cases, the leaves are curled and die. Cultivated in greenhouses, it is often easy to get sick without ventilating and draining moisture in order to keep warm.

Control methods: (1) Crop rotation and stubble, increase the application of farm fertilizer, and improve plant disease resistance. Avoid flood irrigation, early detection of diseased leaves and timely removal.

2) Pharmaceutical control: 75% chlorothalonil wettable powder 600 times liquid, or 58% methamalin manganese zinc wettable powder 500 times, or 40% Dafudan wettable powder 400 times, or 50% promethane wettable powder 1500 times, or 50% Suclin wettable powder 1500 times, once every 7 days, 4 5 times in a row. If there is heavy rain after spraying, it needs to be resprayed.

Hello dear, melon wilt is caused by fungi, fertilizer has a small effect on the prevention and control of the disease, and cannot be washed with fertilizer. On the contrary, over-fertilization can easily lead to the occurrence and spread of diseases, because excessive fertilizer can disrupt the soil balance and affect the immunity and disease resistance of plants. Disease control can be carried out on plants, including timely cleaning of diseased plants, strengthening ventilation, maintaining appropriate soil moisture, and using diseases to prevent and control diseases.

At the same time, high-quality melon and fruit varieties should be selected to ensure a clean and hygienic planting environment to prevent and reduce the risk of diseases.

There may be several causes of melon yellow leaves:

1.Pest and disease attack: During the growth of melon, it will be attacked by a variety of pests and diseases, such as bacterial spot disease, cucumber virus disease and leaf curling disease, etc., which will destroy the normal growth of melon leaves and lead to the appearance of yellow leaves.

2.Improper watering: Excessive or insufficient irrigation of the liquid will affect the growth of the leaves of the melon, which may lead to yellowing or wilting leaves.

3.Malnutrition: If melons lack elements such as nitrogen, potassium, and magnesium, the leaves will begin to yellowish and gradually turn yellow.

How to prevent it:1Pay attention to the irrigation of the melons and do not leave the melons in an over- or under-stated.

2.Fertilize regularly to ensure that the melon has sufficient nutrients and the leaves are green and full.

3.Early prevention and control of the occurrence of pests and diseases and rapid and accurate treatment of diseases.

4.According to the growth length of the melon and its own growth, prune off the diseased part and take appropriate measures to ** sick.