Why do plant leaves turn yellow: all about the leaves as indicators of nutritional deficiencies; because they turn yellow, because they have dry tips or dark edges.
In this guide we will talk about the color variation of leaves linked to nutritional deficiencies. Why do plant leaves turn yellow? Generally due to a lack of iron, nitrogen or a bad absorption of manganese. Let's see all the cases and how to understand what are the causes of yellow leaves on our plant.
Why do the leaves turn yellow
With the beginning of autumn, it is normal to see leaf yellowing. The reason, in this context, is independent of nutritional deficiency but it all depends on the light intensity.
The leaves regulate their biological cycle based on two factors: temperature and light intensity. Theleaves are greendue to the high presence of chlorophyll, a pigment that captures sunlight and initiates the cascade of electro-chemical processes known as chlorophyll photosynthesis. Chlorophyll is essential, however, in the leaf, there are other pigments known ascarotenoids, xanthophylls, anthocyanins… coloryellow, orange, red or bronzeof the leaves is linked to the percentages of these pigments which are more numerous than thechlorophyll.
When autumn arrives and the plant receives fewer hours of light, it is normal for the amount of chlorophyll to begin to decrease. When the plant has a lot of light (and you have not changed the exposure), the leaves turn yellow because the amount of chlorophyll decreases and the plant struggles to do photosynthesis. At this point we must ask ourselves: why does the plant not produce chlorophyll? Why do the leaves turn yellow? Here are the nutritional deficiencies that can induce a yellowing of the leaves.
Why do plant leaves turn yellow
This phenomenon is common to all plants: all plants produce chlorophyll in the same way. In any case, based on the plant, I advise you to plug the deficiency with specific fertilizers. Some fertilizers, in fact, areacidifiers,indispensable when theleaves turn yellowbecause of "too much calcareous water", tap water, if very hard, in fact, is harmful to plants that need a neutral or acid pH reaction ... don't worry, we'll get there step by step!
Nitrogen deficiency and yellow leaves
Nitrogen is essential for the creation of new green fabrics. When a nitrogen deficiency is present, theleaves turn yellow and then wither. Other symptoms of nitrogen deficiency: stunted growth, long thin roots, little or no flowering. This deficiency is very common in all plants, it can cause, for example,yellow leaves roses, lemons and tomatoes.
In the case of yellow tomato leaves, I recommend that you read the article: "how to fertilize the tomato"
In case of yellow leaves in roses, I recommend reading the guide "how to fertilize roses”
In the case of lemon with yellow leaves, the specific guide is available "citrus with yellow leaves”Where I also illustrate other causes such as, for example, root rot.
Iron deficiency and ferric chlorosis
Iron is essential for the production ofchlorophyll. In this case, the first leaves to turn yellow are the smallest and youngest. Furthermore, the leaf blade first turns yellow while the leaf veins remain green.
When it comes toiron deficiencythe leaves turn yellow and gradually turn white.
In this case, you can administer ox blood enriched with iron or any other fertilizer based on chelated iron. Ox's blood is a nitrogen-based fertilizer, enriched with other useful microelements such as iron. To understand what iron-based fertilizers are, I invite you to visit the dedicated Amazon page:fertilizer based on chelated iron.
Not just fertilizer! Pay attention to irrigation, especially if it is acidophilic plants or plants that need a more or less neutral pH soil. Tap water, if rich in limestone, increases the pH of the soil and prevents the absorption of iron and other micronutrients. Irrigate the plants with distilled water (perhaps taken from the air conditioner), rain water or "rested water", left in a bucket for at least 48 hours with two teaspoons of white vinegar. The water deposited on the bottom should not be used for irrigation.
Yellow leaves and too much water
If the plant does not tolerate water stagnation and you have irrigated the plant for a long time ... you may have triggered root rot. In this case there is no going back. Root rot is also often caused by fungi.
Leaves with dry tips
It is water stress, on the contrary ... you are giving the plant little water or, the plant is in the event or outside, where the air is clear and free of humidity. Spray and wet the ground more frequently…. if you just did and notice anyblack tips on the leaves, the plant is still settling and cannot absorb water, you just have to be patient. If the plant starts shedding leaves after you notice the black tips… not only do you need to irrigate but you need to administer a nitrogen fertilizer to allow the plant to develop new tissue and cope with any deficiency.
It often occurs in roses. Notice dark leaf edges or discolored leaves with black spots (necrotic notches). The problem is noticed first on the younger leaves and then on the older ones.
It might be useful:
- Tomatoes with yellow leaves (typically nitrogen deficient)
- Basil with yellow leaves (usually ferric chlorosis)