Plant Stress  

Turns leaves yellow.

1400 years ago people didn't know that water affects the color of leaves. Today we know that too much water or too little water can turn leaves yellow.

Leaf yellowing is often one of the first symptoms of plant stress. If the stress causing condition is not alleviated, yellow leaves may turn brown. A prolonged period of environmental stress causes overall stunting and poor growth. Noticing the pattern and progression of symptoms will help to diagnose the cause of the problem...

Drought
Plants wilt and leaves curl when roots are unable to supply sufficient moisture to the stems and leaves. Wilting for short periods of time does not harm plants. Sometimes a plant wilts on a hot day because moisture is evaporating from the leaves faster than the roots can supply it. If there is ample soil moisture, the plant will absorb water in the evening to firm up the stems and leaves. Over a prolonged period, however, drought will cause serious damage, such as yellowing, leaf scorch, browning, or leaf drop and stunted growth. Extended periods of drought also inhibit flower formation. Severe heat and water stress when a plant is in bloom may cause scorching or browning of flower buds and blossoms. Plants vary in their ability to tolerate drought and some may die suddenly after extended periods of drought.

Excess Water
Problems with excess water can result from poorly drained soil or overwatering. Excess water reduces oxygen in the soil, which damages fine roots and renders the plant unable to take up water. Plants exposed to excess moisture show the same symptoms as plants under drought stress. The primary symptom of excess moisture is wilting or yellowing of lower and inner leaves. If excess water continues, plants may show other drought symptoms, such as scorch, leaf drop, and/ or plant death.
University Of Maryland, Leaf Yellowing - Environmental Stress, 2019

Water is related to the yellowing of leaves. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered.

[Quran 39:21] Have you not considered how Allah sends down water from the sky, then He makes it flow into underground wells, then He produces with it plants of various colors, then they wither and you see them yellowing, then He turns them into debris? Surely in this is a reminder for those with understanding.

Here water is related to the yellowing of leaves. Today we know that too much water or too little water can turn leaves yellow. No mistakes in the Quran.

How could an illiterate man who lived 1400 years ago have known that water is related to the yellowing of leaves?

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