Soil Water States and Plant Needs
Plants depend on soil moisture for survival. Insufficient water extraction leads to stress and wilting.
Analyzing Soil Water Options
Let's evaluate the options regarding the state where plants fail to extract sufficient water:
- Maximum saturated point: Soil is fully waterlogged. Plants usually have easy access to water here, not a state of failure.
- Permanent wilting point (PWP): This is the soil moisture level below which plants cannot recover from wilting because water is held too tightly by soil particles for roots to extract. This aligns closely with the definition of plants failing to extract sufficient water.
- Ultimate utilization point: This term is not a standard concept in soil science or plant physiology.
Conclusion based on Provided Answer
The question describes a situation where plants cannot get enough water. While the permanent wilting point is the standard definition for this condition, the provided correct answer is 'None of these'. This indicates that the question setter may be considering nuances not captured by the standard definition or that the listed options are deemed inadequate for the precise match required.
Important Questions from Water Requirement of Crops
- A tubewell operating $10\text{ hours}$ per day discharges water at a rate of $25\text{ m}^3\text{.h}^{-1}$. The average irrigation depth is $80\text{ mm}$, and irrigation interval is $20\text{ days}$. If intensity of irrigation is $80\%$, the culturable command area (in hectares) is ________. (Rounded off to two decimal places)
Irrigation water having SAR value of 20, is called
The ratio between the areas of a crop irrigated and the quantity of water required during its entire period of growth is known as
Alkaline soils are reclaimed by
For crops like potato and sugar-beets, the commonly adopted method of surface irrigation is
