Farmers should use weedicides carefully to avoid health risks. During application, they should cover their nose and mouth with a cloth to protect against potential adverse effects on health. NCERT Class 8 Science Chapter 1 Crop Production and Management
Category: Class 8 Science
NCERT Solutions and important questions for Class 8 science for CBSE 2020-2021.
Tiwari Academy Discussion Latest Questions
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
Fertilizers are chemical compounds rich in specific nutrients, produced in factories. Examples include urea, ammonium sulfate, superphosphate, potash, and NPK (Nitrogen, Phosphorus, Potassium). NCERT Class 8 Science Chapter 1 Crop Production and Management
Excessive fertilizer use reduces soil fertility, leads to water pollution, and harms the environment. To maintain soil fertility, farmers are encouraged to substitute fertilizers with organic manure or practice fallow periods. NCERT Class 8 Science Chapter 1 Crop Production and Management
Continuous cultivation depletes soil nutrients, necessitating the addition of manure to replenish them and support healthy plant growth. NCERT Class 8 Science Chapter 1 Crop Production and Management
Ploughing is now done by tractor-driven cultivators, saving labor and time. The use of cultivators in modern agriculture has replaced traditional ploughs in many instances. NCERT Class 8 Science Chapter 1 Crop Production and Management