Irrigation starts when 60% of available soil water remains. Field capacity and wilting point are 32% and 12% by mass. Bulk density is 1.5 g/cm³, root depth 50 cm and application efficiency 75%. Find gross irrigation depth in cm.
Total available gravimetric water is 0.32−0.12=0.20. Depletion is 40%, so moisture deficit is 0.08 kg/kg. Net depth is 0.08×1.5×50=6 cm. Gross depth accounts for application losses: 6/0.75=8 cm, B.
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