Types and Identification of Nutrient Deficiency Symptoms in Plants
Deficiency symptoms in plants are caused by bacterias or diseases and can also be caused due to the lack of necessary elements. These deficiency symptoms of necessary elements can be seen through different methods in plants. There is a mixture of different nutrients that plants need for their growth and to stay healthy. The nutrients required by plants in large amounts are called macronutrients. Examples of macronutrients are potassium, nitrogen, phosphorus, magnesium etc.
Nutrients required in small amounts are called micronutrients. Examples of micronutrients are copper, boron, iron etc.
Deficiency Symptoms for Macronutrients
There are many deficiency symptoms seen or observed in plants. Let us discuss them. Deficiency symptoms for macronutrients are as follows:-
1. Nitrogen:
We all know that protein is very important for all living organisms because it leads to healthy growth and development. Nitrogen is one of the significant elements required in protein. It also contributes 1% to 6% (approximately) of the plant#39;s dry matter. So nitrogen deficiency can easily be seen in the growth and development of plants. Yellowing is seen in stems and leaves.
2. Calcium:
Calcium plays a vital role in signaling and cell wall structure. Calcium deficiency affects the early growing leaves and the growth points of plants. Newly leaves seem to be hooked or distorted. Black spots may also appear near the mid leaf and the growth of plants may be stopped.
3. Magnesium:
It is the inner element present in chlorophyll and is also very important for plant metabolism. It also transports carbohydrates within the plant body. Yellow and dark spots are seen in the new growth of plants.
4. Potassium:
Potassium is a very important element for plants. It plays a very important role in the formation of starch, movement of sugar and pH stabilization. Deficiency of potassium leads to a sudden development of a tissue called necrotic tissue, due to which the leaves may appear to curl downwards.
5. Phosphorus:
Phosphorus is required by plants for photosynthesis and transpiration. These processes require energy in the form of Adenosine triphosphate (requires phosphorus). If plants lack phosphorus these processes will not perform well, the leaves also may become reddish-purple and the old leaves may turn black.
6. Sulfur:
Amino acids require protein synthesis which in turn require sulfur. The light green-yellow pigment can be seen due to the deficiency of sulfur which usually happens in early growing leaves.
Deficiency Symptoms for Micronutrients
There are also many deficiencies for Micronutrients. Earlier we discussed the deficiencies of micronutrients in plants and now let us move forward to the micronutrients:
1. Boron - The death of terminal buds might take place due to the lack of growth in plants.
2. Copper - Lack of growth in roots and stem might be observed.
3. Manganese - Due to this, the shoots, fruits and leaves might diminish in size and color.
4. Zinc - Purple pigmentation occurs along with veinal chlorosis.
5. Molybdenum - Leaves might turn yellow and they also might distort.
Test Your Knowledge
i. Which of the following comprise the elements that help to complete the lifecycle of plants?
(a) Essential elements.
(b) Non-essential elements.
(c) Macro element.
(d) Micro element.
ii. Who had put forward the concept of essential mineral nutrients required by plants?
(a) Carl Linnaeus.
(b) Arnon and Stout.
(c) Aristotle.
(d) Leonhart Fuchs.
Solutions
i. (a) Essential elements.
ii. (b) Arnon and Stout
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Do You know?
The most effective way to grow healthy plants is to improve the quality of the soil by adding compost or well-rotted manure. Spreading organic mulches around plants also enhances the quality of soil to a great extent. Nutritional problems can be addressed by keeping the soil depth at around 50 mm.
FAQs on Deficiency Symptoms in Plants and Nutrient Disorders
1. What are deficiency symptoms in plants?
Deficiency symptoms in plants are visible signs that appear when a plant lacks an essential mineral nutrient required for normal growth and metabolism. These symptoms occur because nutrients are involved in vital processes like photosynthesis, protein synthesis, and enzyme activation.
- Common signs include chlorosis (yellowing of leaves)
- Necrosis (death of tissue)
- Stunted growth
- Poor flowering or fruiting
2. What are the common symptoms of nitrogen deficiency in plants?
Nitrogen deficiency in plants primarily causes yellowing of older leaves and reduced growth. Since nitrogen is a mobile nutrient and a key component of chlorophyll and amino acids, its deficiency shows first in older leaves.
- General chlorosis starting from lower leaves
- Stunted plant growth
- Thin stems
- Reduced protein synthesis
3. Why does iron deficiency cause chlorosis in young leaves?
Iron deficiency causes chlorosis in young leaves because iron is an immobile nutrient required for chlorophyll formation. Since iron cannot move from older to younger tissues, symptoms appear first in new leaves.
- Interveinal chlorosis (veins remain green)
- Pale or yellow young leaves
- Reduced photosynthetic activity
4. What is the difference between mobile and immobile nutrient deficiency symptoms?
The key difference is that mobile nutrient deficiencies appear first in older leaves, while immobile nutrient deficiencies appear in younger leaves. Mobility determines whether a nutrient can be transported within the plant.
- Mobile nutrients: Nitrogen, Phosphorus, Potassium → symptoms in older leaves
- Immobile nutrients: Calcium, Iron, Boron → symptoms in younger leaves
5. What are the symptoms of potassium deficiency in plants?
Potassium deficiency mainly causes brown leaf margins and weak stems. Potassium is essential for enzyme activation and water regulation in plants.
- Marginal chlorosis progressing to necrosis
- Weak stems and lodging
- Poor resistance to diseases
- Reduced fruit quality
6. What are the signs of phosphorus deficiency in plants?
Phosphorus deficiency causes stunted growth and dark green or purplish leaves. Phosphorus is vital for ATP production and energy transfer in plants.
- Slow growth and delayed maturity
- Purple coloration due to anthocyanin accumulation
- Poor root development
7. How does calcium deficiency affect plant growth?
Calcium deficiency primarily affects growing tissues and causes death of shoot and root tips. Calcium is essential for cell wall formation and membrane stability.
- Deformed young leaves
- Blossom end rot in tomatoes
- Necrosis of meristematic tissues
8. What is chlorosis and why does it occur in nutrient deficiency?
Chlorosis is the yellowing of leaves due to reduced chlorophyll content. It commonly occurs when nutrients involved in chlorophyll synthesis, such as Nitrogen, Magnesium, or Iron, are deficient.
- Uniform yellowing → often nitrogen deficiency
- Interveinal yellowing → often iron or magnesium deficiency
- Reduced photosynthesis
9. Can micronutrient deficiencies cause serious plant disorders?
Yes, deficiencies of micronutrients like iron, zinc, boron, and manganese can cause severe physiological disorders in plants. Though required in small amounts, these nutrients are essential for enzyme function and metabolic pathways.
- Zinc deficiency → short internodes (rosetting)
- Boron deficiency → poor fruit and seed development
- Manganese deficiency → interveinal chlorosis
10. How can plant nutrient deficiencies be corrected?
Plant nutrient deficiencies can be corrected by supplying the lacking nutrient through soil or foliar application of fertilizers. Proper diagnosis is essential before treatment.
- Apply specific fertilizers (e.g., urea for nitrogen)
- Use foliar sprays for rapid correction
- Maintain proper soil pH for nutrient availability
- Improve soil organic matter
