Weedicides are chemicals, like 2,4-D, used to control weeds. They are diluted with water and sprayed in fields during the vegetative growth of weeds, ensuring minimal impact on crops. NCERT Class 8 Science Chapter 1 Crop Production and Management

Farmers manually remove weeds by uprooting or cutting them close to the ground using tools like khurpi. The best time for weed removal is before they produce flowers and seeds. NCERT Class 8 Science Chapter 1 Crop Production and Management

Weeding is essential as weeds compete with crops for water, nutrients, space, and light, adversely affecting crop growth and sometimes posing risks to humans and animals. NCERT Class 8 Science Chapter 1 Crop Production and Management

Manure enhances soil texture, water retention, and nutrient levels. Crop rotation, growing different crops alternately, helps replenish soil nutrients, as seen in traditional practices like growing legumes and wheat alternately. NCERT Class 8 Science Chapter 1 Crop Production and Management

Manure is an organic substance derived from decomposed plant or animal waste. Farmers decompose plant and animal waste in pits to produce organic manure. NCERT Class 8 Science Chapter 1 Crop Production and Management