Class 8ScienceCrop Production and Management
Fertilisers and Manures
Manure: decomposed animal/plant waste — improves soil texture and microorganisms, organic, slow-acting. Fertilisers: chemical compounds, fast-acting, specific nutrients. NPK: Nitrogen (leafy growth), Phosphorus (root growth), Potassium (fruit/flower). Urea (nitrogen), DAP (phosphorus). Overuse of chemical fertilisers: soil degradation, water pollution. Green revolution used heavy fertilisers + HYV seeds.
10 examples
Concept check 1
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on concept check and show the working clearly.
Definition to application 2
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on definition to application and show the working clearly.
Formula warm-up 3
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on formula warm-up and show the working clearly.
Reasoning practice 4
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on reasoning practice and show the working clearly.
Board-style short answer 5
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on board-style short answer and show the working clearly.
Mistake correction 6
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on mistake correction and show the working clearly.
Visual interpretation 7
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on visual interpretation and show the working clearly.
Applied word problem 8
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on applied word problem and show the working clearly.
Revision challenge 9
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on revision challenge and show the working clearly.
Exam recap 10
For Class 8 Science, explain or solve a fertilisers and manures question from the chapter "Crop Production and Management". Focus on exam recap and show the working clearly.