Explain why it is not advisable for farmers to add slaked lime and ammonium-based fertilizers to their crop soil at the same time.

When both substances are added at the same time, they will react to produce a salt, ammonia gas and water.

Slaked lime will be used up in the reaction, hence the acidity of the soil will not be reduced.

Fertilizers will be used up in the reaction. Ammonia gas produced will escape to the surroundings, so nitrogen element, which is needed by the plants for healthy growth, will not be absorbed by the plants.