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When a plant first begins to wilt permanently in a pot, its 54.5 gm of soil has 4.5 gm of water. The **Permanent Wilting Point (PWP)** of this soil is:

a) 4.5%

b) 9%

c) 8.25%

d) 16.5%

Please find below the solution to the asked query

The correct option is b).

The minimal point of soil water required by plant not to wilt is called permanent wilting point (PWP). It can be determined as:

Mass of soil with water = 54.5gm

Mass of water = 4.5gm

Therefore, mass of dry soil = 54.5-4.5 = 50gm

PWP or Moisture content = $\frac{\mathrm{Mass}\mathrm{of}\mathrm{water}}{\mathrm{Mass}\mathrm{of}\mathrm{dry}\mathrm{soil}}x100=\frac{4.5}{50}\mathrm{x}100=9\%.$

Hope this information will clear your doubts about the permanent wilting point (PWP).

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