(a) In a tabular form, briefly discuss the following plant nutrients: (i) Potassium; (ii) Phosphorus; (iii) Calcium. Under the following headings: (i) form ...
Question 1 Report
(a) In a tabular form, briefly discuss the following plant nutrients: (i) Potassium; (ii) Phosphorus; (iii) Calcium. Under the following headings: (i) form in which it is absorbed; (ii) three functions; (iii) one deficiency symptom.
(b) Give two examples of nitrogenous fertilizers.
Answer Details
(a) Plant nutrients
| Nutrient | Form absorbed | Three functions | One deficiency symptom |
|---|---|---|---|
| (i) Potassium (K) | K+ (potassium ion) | Promotes formation and translocation of carbohydrates/sugars; strengthens stems and improves disease resistance; aids flowering, fruiting and root development | Scorching/yellowing of leaf margins (marginal leaf scorch) |
| (ii) Phosphorus (P) | H2PO4- and HPO42- (phosphate ions) | Promotes root development; aids flowering, fruiting and seed formation; involved in energy transfer and early maturity | Purple/reddish colouration of leaves and stunted growth |
| (iii) Calcium (Ca) | Ca2+ (calcium ion) | Forms and strengthens cell walls; promotes root and shoot tip growth; neutralises soil acidity and aids nutrient uptake | Death of growing points (terminal buds) and deformed, curled young leaves |
(b) Two examples of nitrogenous fertilizers
- Urea.
- Ammonium sulphate (also calcium ammonium nitrate).
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