Aim : To study the effects of Macronutrient Deficiency in Plants
Hypothesis : A plant is healthier if it is grown in a complete culture solution (Knop's solution)
a) MV : Components of minerals in culture solution
b) RV: Condition of plant
c) FV : Volume of solution//size and type of maize seedlings//amount of sunlight//air
Observations
| Boiling tube | Nutrient deficient | Effects on seedlings |
| A | All | No growth or a stunted and weak seedling |
| B | None | A healthy seedling with a large and sturdy stem and dark green leaves |
| C | Nitrogen | Yellow and small leaves with minimum growth |
| D | Phosphorus | A stunted seedling with dark green leaves and red spots |
| E | Potassium | A seedling with small yellow leaves and soft stem |
| F | Calcium | Stunted seedling with irregular shapes of leaves and dying shoots |
| G | Magnesium | A seedling with yellow and dying leaves |
| H | Sulphur | A seedling with light green leaves and stunted roots |
1. To shield the culture solution from light because algae will grow in the culture solution if light is present and compete with the maize for nutrients.
2. To supply oxygen to the roots for respiration.
3. The seedling in A is the least healthy because no nutrients was given to it. The seedling in B was healthiest because it was grown in a complete culture solution where all macronutrients were present.
Conclusion : the hypothesis is accepted. A plant is healthier if it is grown in a complete culture solution (Knop's solution)
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