Question

Please do it. It is very important.​

Answer 1

1. Manure
2. Open field system
3. organic farming
4. Flood
5. Pest

Answer 2

Answer:

1)NPK(nitrogen, phosphorus,pottasium)

2) bcoz to get soil fertility again for that they leave some animals into field for a long by which they excrete the dung and eat leftover dry plants from this soil will be fertile.

3) from organic manure the soil doesn't loose fertility instead it gain fertility and give nutritioned crops

5)birds,insects, caterpillar,etc these harms plants by eating crops.

Explanation:

4) I didn't know the perfect ans.