The lower physiological boundary of plant-available soil water is designated ____________________?
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Answer: B. Wilting point
Explanation
The permanent wilting point marks the specific soil moisture tension where plant roots cannot extract water. At this critical threshold, soil matric potential exceeds the osmotic pressure within root cell membranes. Plants unable to obtain moisture from this point onward will wilt permanently and eventually die. Soil water is held within capillary pores with varying degrees of adhesive and cohesive energy. Plant-available water lies between field capacity and the permanent wilting point moisture levels. Agronomists measure soil suction in bars or megapascals to determine irrigation scheduling thresholds.
Farmers monitor soil moisture depletion to initiate irrigation before crops reach the wilting point. Drought-resistant crop varieties often exhibit physiological adaptations that lower their effective wilting point. Understanding soil water retention curves helps agricultural engineers design efficient drip irrigation systems. Field capacity represents the upper boundary of plant-available water after gravitational drainage ceases. Available water defines the total range between field capacity and the permanent wilting point. Hygroscopic water is tightly bound to soil particles and remains entirely unavailable to plant roots.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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