Describe the symptoms in a plant with nitrate ion deficiency and magnesium ion deficiency.

6.2 Plant Nutrition – Mineral Requirements

Nitrate Ion ($NO_3^-$) Deficiency

When plants don’t get enough nitrate, they act like a student who forgot to bring their textbook to class. The leaves turn pale and yellow, especially the older ones, because the plant can’t make enough proteins.

• Yellowing of older leaves (chlorosis) – like a faded photo.
• Stunted growth – the plant is “short” like a child who didn’t eat enough.
• Weak stems – the plant feels “brittle” and may bend easily.
• Reduced fruit/seed production – fewer “prizes” at the end of the season.

Magnesium Ion ($Mg^{2+}$) Deficiency

Magnesium is the “hub” of chlorophyll, the green pigment that powers photosynthesis. Imagine a city’s traffic lights (chlorophyll) turning off because the power supply (magnesium) is missing.

• Interveinal yellowing – the veins stay green while the spaces turn yellow, like a road with broken paint.
• Leaves become narrow and rolled – the plant “tucks in” its leaves.
• Leaves may turn brown at the edges – the “edges” are the first to feel the lack.
• Overall plant looks “sad” and weak.

How to Fix the Deficiencies

1. For nitrate: add a nitrogenous fertilizer like urea or ammonium nitrate. Think of it as giving the plant a protein shake.
2. For magnesium: apply magnesium sulfate (Epsom salts) or dolomitic lime. Imagine adding a power cable to the traffic lights.

Comparison Table

Remember: “Nitrate is the plant’s protein factory, magnesium is the green power‑hub.” 🌱