Plant Nutrition Notes with PDF
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Plant Water and Nutrient Transport
Water Absorption and Conduction
- Site of Absorption: Root hairs are the primary site for water absorption.
- Conduction Tissue: Water is conducted throughout the plant by the xylem tissue.
- Function of Xylem: The main function of xylem is the transportation of water.
- Girdling Effect: Removing a ring of bark (girdling) around a tree base kills the tree. This is because the phloem, which transports food, is destroyed, starving the roots of energy.
Food and Nutrient Conduction
- Conduction Tissue: Phloem is the living tissue responsible for transporting organic nutrients (food).
- Function of Phloem: The primary function of phloem is the transportation of food.
Plant Nutrition and Nutrients
Essential Nutrients
Essential nutrients are divided into two categories based on the quantity required by plants:
- Macronutrients: Required in larger quantities.
- Examples: Potassium (K), Calcium (Ca), Magnesium (Mg), Sulphur (S).
- Note: Sulphur (S) is important for enhancing oil content in crops like mustard.
- Micronutrients: Required in trace amounts.
- Examples: Iron (Fe), Manganese (Mn), Copper (Cu), Zinc (Zn), Boron (B), Chlorine (Cl).
Non-Essential and Special Cases
- Non-Essential Nutrient: Sodium (Na) is not considered an essential nutrient for plant growth.
- Nodule Formation: For nodule formation in legume plants (which house nitrogen-fixing bacteria), a specific nutrient like nitrogen or boron is not necessary. The process relies on a symbiotic relationship.
- Assessment Method: Crop logging is a method of plant analysis used to assess nutrient requirements for crop production.
Plant Adaptations and Interactions
Parasitic Plants
- Example: Cuscuta (Amarbel) is a parasitic angiosperm.
- Nutrition Source: It derives its nutrition from the stem of the host plant, not the leaves.
- Contrasting Adaptations: Other plants like the Pitcher plant and Bladderwort are insectivorous and are not typically classified as parasites in the same way as Cuscuta.
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