Q.65
Which of the following irrigation scheduling methods relies on soil moisture measurements to determine when irrigation is
needed?
- Soil Moisture Sensors: Direct sensing instruments (such as gypsum electrical resistance blocks, tensiometers, Time Domain Reflectometry (TDR), and capacitance probes) installed at effective crop root depths to monitor soil water tension or volumetric water content.
- Comparison: Calendar-based scheduling uses fixed time intervals regardless of soil moisture; pan evaporation and Crop Water Stress Index (CWSI) rely on atmospheric evaporative demand or canopy infrared temperature. (Correct answer: Option 4)
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