The correct option is
D Applying fertilizers through drip irrigation
The correct option is D.
Explanation of correct option:
- Drip irrigation is the method in which plants are watered drop by drop.
- In fertigation, fertilizers are added to the water and then the crop is irrigated by a drip system.
- Fertigation allows the application of only small amounts of fertilizers.
- It is commonly used to correct nutrient deficiencies in plants.
Explanation of the incorrect options:
Option A:
- A sprinkler irrigation system is a process of irrigation where plants are watered by fixing pipes with rotating nozzles.
Option B:
- The river life system refers to the living system present inside the river, like fishes and their survival.
Option C:
- The river valley system can be referred to as some irrigation techniques where canals are made for watering crops.
Final answer: Fertigation is applying fertilizers through drip irrigation.