Use of biofertilizers as a nutrient source is a practised in __________.

Organic farming

The correct answer is Option (3) → Organic farming

Biofertilizers are used in organic farming as a natural nutrient source. They consist of living microorganisms, such as bacteria, fungi, or algae, which help to enhance soil fertility by fixing nitrogen, decomposing organic matter, or improving nutrient availability to plants. Organic farming emphasizes the use of natural substances and processes, avoiding synthetic chemicals, which is why biofertilizers are commonly used in this farming method.

Inorganic farming: This is not the correct answer because inorganic farming relies on synthetic chemicals like chemical fertilizers and pesticides. Biofertilizers, being organic and natural, do not align with the concept of inorganic farming.

Animal husbandry: This refers to the breeding and care of animals such as cattle, poultry, and sheep. While animal husbandry may involve using organic waste products like manure, it is not directly related to the use of biofertilizers in plant growth.

Crop rotation: Crop rotation is an agricultural practice where different crops are planted in a sequential manner to improve soil health and reduce pests and diseases. While crop rotation can improve soil fertility, it is not specifically related to the use of biofertilizers as a nutrient source.