(a)(i) State six uses of lime in Agriculture (ii) List four common liming materials (b) State (i) Three examples of nitrogenous fertilizer: (ii) three examp...

Answer Details

(a)

(i) Six uses of lime in Agriculture are:

1. To increase soil pH: Lime is used to neutralize acidic soils and increase the pH of the soil, making it more suitable for crop growth.
2. To provide calcium and magnesium: Lime contains calcium and magnesium, which are essential nutrients for plant growth.
3. To improve soil structure: Lime reacts with the soil particles to form stable aggregates, which improves soil structure and reduces erosion.
4. To release nutrients: Lime helps to release nutrients such as phosphorus, potassium, and micronutrients from the soil, making them available to plants.
5. To control soil-borne diseases: Lime can reduce the severity of certain soil-borne diseases such as clubroot and fusarium wilt.
6. To enhance the effectiveness of fertilizers: Lime can increase the effectiveness of certain fertilizers by improving nutrient uptake and reducing nutrient leaching.

(ii) Four common liming materials are:

1. Agricultural limestone: This is the most common type of lime used in agriculture. It is made from crushed limestone and is relatively inexpensive.
2. Dolomitic limestone: This type of lime contains both calcium and magnesium and is used in soils that are deficient in both nutrients.
3. Hydrated lime: This is a quick-acting lime that is often used to correct severe soil acidity problems.
4. Burnt lime: This is a form of lime that is produced by heating limestone in a kiln. It is often used to make lime mortar for building construction.

(b)

(i) Three examples of nitrogenous fertilizer are:

1. Urea: Urea is the most commonly used nitrogen fertilizer worldwide. It is a white crystalline substance that contains 46% nitrogen.
2. Ammonium nitrate: This is a high-nitrogen fertilizer that contains both ammonium and nitrate ions. It is often used as a top-dressing for crops.
3. Ammonium sulfate: This is a nitrogen fertilizer that also contains sulfur. It is often used on crops that require both nitrogen and sulfur.

(ii) Three examples of a phosphorus fertilizer are:

1. Triple superphosphate: This is a highly concentrated phosphorus fertilizer that contains about 46% phosphorus.
2. Di-ammonium phosphate: This is a fertilizer that contains both nitrogen and phosphorus. It is often used on crops that require both nutrients.
3. Mono-ammonium phosphate: This is a fertilizer that contains both nitrogen and phosphorus. It is often used on crops that require both nutrients.