What elements do you owe leaves will turn yellow as the title Thank you

Nitrogen deficiency The plant is thin and weak, with slender and stiff branches, small leaves and small flowers. The leaf color gradually fades from the old leaves to the new leaves, and then appears reddish-purple, until it turns yellow and falls off, and in severe cases, the whole plant loses its green color. Prevention and control methods Increase the application of well-rotted human feces, cake fertilizer, manure or ammonium sulfate, urea, ammonium nitrate and other fertilizers.

Phosphorus deficiency The leaves turn from dark green to copper, and the veins (especially petioles) are yellow with purple in color. Flower buds are difficult to form, and the flowers are small, few and pale in color, resulting in poor fruit development and even early wilting. The control method is to increase the application of bone meal, fish meal, poultry fertilizer or superphosphate, ammonium phosphate, potassium phosphate (for phosphorus, potassium compound fertilizer), generally with about 0 10 aqueous solution as root top dressing.

Potassium deficiency Plants are short and have soft stems that are prone to lodging. The leaves are often shrivelled, and the old leaves appear black-brown spots along the leaf edges from the tip of the leaf, and the surrounding leaves turn yellow, while the middle and leaf pulse are still green. Control methods Increase the application of plant ash, 1 2 potassium chloride aqueous solution (bulbs and tubers and flowers should not be used), 0 30 0 50 potassium nitrate aqueous solution as root top dressing, potassium phosphate and other inorganic fertilizers can also be used.

Calcium deficiency Young leaves are green and shrivelled, the leaf margins are curled with white streaks, the flowers are blocked, and the new leaves are difficult or diseasefully twisted. Prevention and control methods Half a month before sowing or potting, apply an appropriate amount of calcium chloride in the soil, which can play a role in increasing calcium and disinfection (acidic flowers should not be used), and calcium nitrate can also be used as top dressing. Magnesium deficiency Plants do not grow vigorously.

The old leaves gradually lose green and turn white from bottom to top from the leaf margin to **, and various spots appear on the leaf veins, and finally the whole leaf turns yellow. Prevention and control method spray 3-4 times continuously with 0 20 0 40 magnesium sulfate aqueous solution, with an interval of 7 10 days each time. Severely magnesium deficient soils are treated with 5 10 kg of magnesium sulfate per mu, which is mixed with basal fertilizer in autumn or winter and applied to the soil.

Sulfur deficiency Young leaves begin to yellowish from the veins, and finally until the whole leaves turn yellow, and the root system is not developed normally. Iron deficiency yellows from young to old leaves. Sulfur deficiency and iron deficiency prevention and control methods can be sprayed with 0 30 ferrous sulfate aqueous solution, 3 times in a row, with an interval of 1 week each time, and the fog point should be fine and uniform when spraying.

At the same time, 0 20 urea iron solution can be used for extra-root top dressing.

Yellowing of the leaves of trees is most likely due to a deficiency of calcium, iron, nitrogen, phosphorus and potassium. If the new shoots and leaves of a tree are yellow, it may be that the tree is deficient in calcium and iron. If the old leaves of the tree are yellow, it may be that the tree lacks nitrogen, phosphorus and potassium, and it should be supplemented according to the situation.

If the young leaves turn yellow during the growth period, it may be due to a lack of calcium and iron. Calcium maintains the structure of the cell and allows it to function properly, and if calcium is insufficient, the sprouts and leaves will turn yellow. Iron promotes the formation of chlorophyll, and if there is a lack of iron in new leaves, the color will turn yellow.

The calcium required for the growth of trees generally comes from the soil, and the fertile soil contains a certain amount of calcium, which can meet the normal growth of trees. Iron comes from the soil and regulators, during the maintenance period, if the tree is deficient in iron and causes the leaves to turn yellow, it can be watered with ferrous sulfate solution, which can be supplemented with iron, which is conducive to the growth of trees.

During the growth period of the tree, the leaf color of the old leaves turns yellow, in addition to the normal shedding of the leaves aging, it may be a lack of nitrogen, phosphorus, potassium and other elements. Nitrogen, phosphorus, and potassium are important elements for tree growth, all of which come from fertilizers. Nitrogen fertilizer promotes the formation of chlorophyll and the growth of branches and leaves, and is generally suitable for fertilizing trees during the growth period.

Phosphorus can promote the growth of trees, which can make them photosynthesize normally, which is conducive to the formation of chlorophyll. Potassium can enhance the ability of plants to resist diseases and droughts, and can prevent trees from being attacked by pests and diseases that cause yellowing or wilting of leaves. Phosphorus and potassium are derived from phosphate and potassium fertilizers, which are important nutrients for trees during their growth.

Summary. In general, if the young leaves of the plant are newly grown and yellow, it should be lacking in iron and calcium; If the old leaves of the plant are yellow, it is lacking in nitrogen, potassium, phosphorus and magnesium.

In general, if the young leaves of the plant are newly grown and yellow, it should be lacking in iron and calcium; If the old leaves of the cherry tree are yellow, it is lacking in nitrogen, potassium, phosphorus and magnesium.

I'm asking what makes leaves yellow?

There is a medicine called abscisic acid that makes its leaves turn yellow without the tree dying. You can also spray low concentrations of sulfuric acid, pay attention to harm.

What is there that is applied to the leaves and then slowly turns yellow?

Abscisic acid is fine.

The synthesis of chlorophyll is related to the absorption of magnesium. Magnesium is a major factor in chlorophyll synthesis.

Magnesium, magnesium is an important part of chlorophyll, the lack of magnesium element, will cause chlorophyll synthesis disorders, plants will not be able to show green, the lutein in plants is relatively stable, at this time it will show the color of lutein, it will become yellow.

If iron is missing, the young leaves will turn yellow. If magnesium is missing, the magnesium in the old leaves is transported to the new leaves to produce chlorophyll, which is destroyed and appears yellow.