Topic · 6 questions · 24 marks

Plant Nutrition (NPK & deficiencies)

Roles of N, P, K, deficiency symptoms, iron lock-up in alkaline soils.

Describe the visual symptoms of nitrogen deficiency in a leafy vegetable crop.

State the main role of nitrogen, phosphorus and potassium in plant growth.

Compare organic and inorganic fertilisers for use on a vegetable plot.

Describe the symptoms of magnesium deficiency and how it can be corrected.

Describe the symptoms of iron deficiency and the conditions under which it occurs.

State the NPK analysis you would expect for (a) sulphate of ammonia, (b) superphosphate, (c) sulphate of potash.