Why is lettuce so yellow and what causes it? 50

Leaf scorching is a process in which the leaves of lettuce turn brown at the outermost edges, as if they are dry, and some of them will die and even spread to the veins. Once the color of the lettuce leaves fades and the water gradually decreases, it will appear that the leaves are scorched or dried up, which is also some manifestations of lettuce after leaf scorch.

In the event of high temperature and low humidity, the water in the leaf will be depleted, and the leaf edge cells will die. Similar symptoms occur when the root system absorbs too little water, inhibiting water transport. Weak root growth, dry and low temperature soil, high salt concentration and other factors can hinder the water absorption of plants, especially for adult plants, due to the large and large leaves, water loss is prone to scorching symptoms.

There is a difference between planting flowers and growing vegetables: the growth cycle of planting vegetables is short (taking leafy vegetables as an example, about 30 to 40 days from germination to market), in order to make the leaves and stems of vegetables grow fully in this short time, it requires a lot of water and fertilizer, sunlight (temperature).

If the water, fertilizer, sunlight (temperature) is insufficient, the growth is stunted, and the growth of the vegetable does not grow much beyond the growth cycle, and the growth of the dish will gradually weaken, even if it can grow to the predetermined size later. The dishes are also old and not delicious. Therefore, when the growth cycle comes, you should also pick it and eat it.

It is not long beyond the growth cycle, and the growth of this dish is gradually weakening, which coincides with frostbite in cold weather is inevitable If it is not for frostbite, the dish will slowly appear on its own with this or that disease, and it will be eliminated by itself after expiration.

The yellowing of lettuce leaves may be the first cause of excessive application of nail fertilizer. The second is caused by excessive application of micro-fertilizer, the third is the lack of medium and trace elements, and the fourth is caused by tobacco damage in vegetables.

It may be caused by abscisic acid in the plant, as the saying goes, it is ripe, or it may be a different variety with a special variety.

If the lettuce is fried in the pot, it will definitely turn yellow, no matter how long or short the time you fry, or whether you are on high or low heat, lettuce turns yellow after being fried in the pot, because when the single lettuce is stir-fried in the oil pot, the oil temperature is relatively high, the moisture in the lettuce will be lost quickly, and the leaves will naturally turn yellow. If you don't like to eat this yellowed lettuce, then we can actually cook it differently. <>

First we can cut off the roots of the lettuce, then we can leave all the leaves of the lettuce, then we can wash the lettuce with water, and after washing we can set it aside and drain it. Add an appropriate amount of water to the pot, heat it over high heat, and after seeing the water in the pot boiling, you can put the lettuce leaves in the water and boil. One thing to note is that the cooking time of the vegetable leaves should not be too long, about 20 seconds, and then we can take out the cooked lettuce, and then eat it directly with some sauce.

The lettuce boiled in water not only does not turn yellow, but also has a very good taste, the color is basically green, and the taste is particularly crisp. As for how to make the sauce, it can actually be chosen according to personal taste, it is generally recommended that you can use some light soy sauce, and then add some minced garlic, oyster sauce, edible salt, and an appropriate amount of chicken powder, stir well, we heat it in the pot, and then pour it directly on top of the lettuce, this method is actually very simple. <>

Lettuce is actually a very common ingredient, and the recipes are also diverse, and some people even wash the lettuce and eat it raw. There are also some people who like to roll some barbecue with lettuce, or add some chili peppers to it, and garlic and the like to eat together, in short, lettuce can be said to be very diverse, you can choose different ways to eat according to personal preferences.

This is actually the oxidation behavior of lettuce after high temperature, so it will turn yellow, and many vegetables will have this situation when they are fried.

Because after frying for a long time, the chlorophyll in the vegetables will disappear, so it will turn yellow, which is also a very natural phenomenon.

It may be because you don't have a good grasp of the heat when stir-frying, resulting in the lettuce stir-frying for too long.

This is the reason why lettuce has "rust".

Rust damages the leaves, stems, and fruits of plants. Rust fungi generally only cause local infection, and the affected parts can produce vesicle spots of different colors or blisters, cups, and hairs due to spore accumulation, and some can also cause tumors, rough bark, bushy branches, bent branches and other symptoms on the branches, or cause defoliation, scorched shoots, poor growth, etc. In severe cases, the spores are densely piled into patches, and the plants die quickly due to the evaporation of a large amount of water in the body.

Start the wok, pour the oil, the oil is hot, put in the minced garlic, fry over high heat until fragrant, then pour the soy sauce, the oil consumption, the white sugar, a small spoon each, stir-fry the fragrance, add an appropriate amount of water, after the water is boiled, boil for a while, add water starch, let the soup have some viscosity, turn off the heat, set aside the pot to boil water, after the water boils, drop a few drops of cooking oil and a little salt into the pot, and then put in the lettuce for about 1 minute out of the pot and put it on the plate. Heat the oil in another pot, add minced garlic and stir-fry until fragrant, then add two tablespoons of oyster sauce, a spoonful of light soy sauce, a little salt and stir-fry evenly, and then add some water starch to make a thick juice. Lettuce is sweet and cool in nature, because the stems and leaves contain lettuce, which has the effects of clearing heat and refreshing, analgesic and hypnotic, lowering cholesterol, and assisting **neurasthenia.

Lettuce also contains mannitol and other active ingredients, which have the effects of diuresis and promoting blood circulation, clearing the liver and gallbladder and nourishing the stomach.

<> want to cook a plate of crunchy lettuce, all you need is a basin of ice water. As long as you have it, whether you are cooking garlic lettuce or oyster sauce lettuce, stir-fried lettuce is definitely at the level of a five-star chef. Oyster sauce lettuce is also a very distinctive cold dish, it tastes very crisp and refreshing, but in daily life, there may be some people who make oyster sauce lettuce will always make the lettuce black, and it is very easy to get out of the water, which will greatly affect the taste, fry lettuce with peanut oil or cooked lard, heat the pot, slide the pot twice with oil, put oil and garlic to fry lettuce-like crispy dishes like broccoli, rape, celery, asparagus, shredded potatoes and other dishes to make the taste crisp.

I'll share my tips with you here. , oyster sauce, put some red pepper shreds before starting the pot, steamed fish soy sauce, the action must be coherent, and the stir-fried dish is crisp and green, and the feeling is refreshing.

Lettuce is a common name for leaf lettuce. It is highly nutritious and promotes the absorption of fats and proteins in the human stomach. It is a very healthy ingredient, both raw and cooked.

Stir-fry lettuce in a pot over high heat for no more than a minute, the dish is delicious, the pot is full of gas, and the pot must be hot and red.

Because it is fried for too long, the chlorophyll is lost, so it will turn yellow.

It is because you boil too much, so it will cause the fried lettuce to turn yellow, and the stir-fried lettuce must be controlled and stir-fried slowly over low heat.

It is because you have fried lettuce for too long that it will cause the fried lettuce to turn yellow.

It may be because the heat is too big, the stir-fry time is too long, or it may be that the lettuce itself is not very fresh, which will cause the lettuce to turn yellow.

When you fry yourself, the heat is too low, because the fire is too small, the dish will change, so that the dish will change from the original green to yellow.

It turns yellow because of heat. This kind of lettuce can't be fried, it can only be boiled or eaten cold, and you may not fry it right.

In one case, the leaves turn yellow because no new roots are grown in the axils, and the other is when yellow spots of different sizes appear on both sides of the leaves, which are called brown spots. In another case, due to the abundant sunshine in summer, the temperature is high, and the sun is exposed, solar fever will occur, and the leaves will turn yellow in the light case, and wilt in the heavy case.

Summary. There are many reasons for the yellowing of lettuce leaf edges, such as * soil is too dry and waterlogged roots, * soil alkaline salinization, * soil nitrogen and potassium deficiency, lettuce suffers from pesticide damage, lettuce suffers from downy mildew disease, lettuce growth period genetic changes and other factors, can make lettuce leaf edges yellow; To prevent the yellowing of lettuce leaf margins, it is necessary to improve the organic matter of the soil, improve the pH of the soil, apply nitrogen fertilizer reasonably, moderately increase phosphorus and potassium fertilizer, and moderately replenish water to prevent waterlogging roots. At the same time, it is also necessary to prevent the breeding of pests and diseases and avoid all kinds of pollution.

There are many reasons for the yellowing of lettuce leaf edges, such as * soil is too dry and waterlogged roots, * soil alkaline salinization, * soil nitrogen and potassium deficiency, lettuce suffers from pesticide damage, lettuce suffers from downy mildew disease, lettuce growth period genetic changes and other factors, can make lettuce leaf edges yellow; To prevent the yellowing of lettuce leaf margins, it is necessary to improve the organic matter of the soil, improve the pH of the soil, apply nitrogen fertilizer reasonably, moderately increase phosphorus and potassium fertilizer, and moderately replenish water to prevent waterlogging roots. At the same time, it is also necessary to prevent the breeding of pests and diseases and avoid all kinds of pollution.

Dear, for many reasons.

Causes of yellowing: 1. Caused by excessive application of potassium fertilizer. Potassium overabundance is the most common cause of leaf yellowing in greenhouse production.

2. Caused by excessive application of micro-fertilizer. Excessive use of micro-fertilizer will have a toxic effect, making the growth of vegetables abnormal, and the yellow edge of its leaves is an obvious manifestation of its poor cherry blossoms;

3. Caused by lack of medium and trace elements;

4. Caused by tobacco damage in vegetables;

5. Vegetables are damaged by pesticides and gas;

6. Caused by improper management. For example, excessive watering, or untimely drainage after rain, and other causes of lack of ears, can also make vegetable leaves yellow.