1. Lecture 3 Plant nutrition

2. Essential elements: macronutrients and micronutrients

3. Essential elements: macronutrients and micronutrients

4. Classification of nutrients according to their
biochemical function

5. Classification of nutrients according to their
biochemical function

6. Classification of nutrients according to their
biochemical function

7. Special techniques are used in nutritional studies
- growth of plants with their
roots immersed in nutrient
solution without soil
- requires a large volume of
nutrient solution and frequent
adjustment
- oxygen supply for
root through bubbling
system
- plants my also be grown in
supporting material such as
sand, gravel, vermiculite…
- roots receive ample supply of
oxygen

8. Special techniques are used in nutritional studies
- plants are grown with their
roots suspended in air while
being sprayed continuously
with a nutrient solution
- provides easy manipulation
of the gaseous environment
around the root
- but requires higher levels of
nutrients than hydroponic
culture to sustain plant
growth
- nutrient solution periodically
rises to immerse plant roots
and then recedes, exposing
the roots to moist
atmosphere
culture to sustain growth