Step 1: Define mulching.
Mulching is an agricultural practice where the soil surface is covered with organic or inorganic material to conserve moisture, regulate temperature, and reduce weed growth.
Step 2: Analyze options.
- Green manuring: Incorporating green plants into soil for fertility, not surface covering.
- Conservation tillage: Reducing ploughing to conserve soil, different from covering.
- Mulching: Correct, covering soil with straw, leaves, plastic, etc.
- Contour farming: Cultivation along slopes, not covering.
Step 3: Conclusion.
Hence, covering soil surface is known as mulching.
Final Answer: \[ \boxed{\text{The practice is called Mulching.}} \]
Which of the following concentrated organic manure has the highest percentage of \(P_2O_5\)?
Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world