__Percolation rate of water in soil__

- Percolation is the property of absorption of water by soil.
- If we pour a bottle of water on the floor and another bottle of water in the soil, the water on the floor will flow down but water in the soil will be absorbed.
- The percolation rate is the amount of water absorbed by any soil at any given time.
- Formula for calculating percolation rate is,

** Percolation rate (ml/min) = amount of water (ml) / percolation time (min).**

- For example, If 200 ml of water is percolated through the soil sample in 40 min. Calculate the rate of percolation.

Solution – Rate of percolation is = amount of water (ml)/ percolation time (min)

= 200 ml/ 40 min

= 5 ml/ min

Ans- The rate of percolation is 5 ml/ min.

__Moisture in soil__

- Moisture is the amount of water present in soil.
- During summer, the water content in the soil evaporates and moves up which reflect the sunlight, thus the air above soil seems to shimmer.

__Absorption of water by soil__

- Different soil samples absorb water in different extent.
- The absorption of water by different soil can be find out by taking 50g of different soil samples.
- Pour the soil in different funnels placed in different beakers and pour water in the soil with the help of measuring cylinders.
- Continue pouring until it starts dripping.
- Now, check the amount of water left in the measuring cylinder and subtract it from the initial amount which was taken.
- The resulted amount of water is retained by the soil.
- Formula to calculate percentage of water absorbed is
**Percentage of water absorbed = {(U-V)/50} X 100,**50g is the amount of water absorbed.

U is the initial volume of

V is the final volume of water (ml)

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