Lesson 5
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- Evapotranspiration (ET) factors include climate, plant type and growth stage, soil texture and structure.
- Irrigation requirements are calculated based on crop evapotranspiration (ETc), which is the maximum water requirement under ideal conditions. Net Irrigation Requirement (NIR) is ETc minus effective rainfall (Re).
- Effective Rainfall (Re) is determined using models like FAO-Crop coefficient, Penman-Monteith and Hargreaves equations.
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