Water application and water use efficiencies of different irrigation methods:

• Surface Irrigation (flooding, furrow, border): Lowest efficiency ($30 - 45\%$) due to substantial runoff, deep percolation, and evaporative conveyance losses.
• Sprinkler Irrigation: Intermediate efficiency ($60 - 75\%$), avoiding deep percolation and distribution unevenness but subject to wind drift and canopy evaporation.
• Drip Irrigation: High efficiency ($80 - 90\%$), delivering precise water directly into the crop root zone with minimal evaporation.
• Pitcher pot Irrigation: Highest efficiency ($\gt 90 - 95\%$), an ultra-efficient indigenous sub-surface method where unglazed porous clay pots buried in the root zone release water purely by soil matric suction gradient without any evaporation or deep percolation losses.
  Increasing order: Surface (C) < Sprinkler (D) < Drip (A) < Pitcher pot (B) -> (C), (D), (A), (B) (Option 4).

Water requirements of major field and horticultural crops:

• Sugarcane is a long-duration perennial crop (12-18 months) with high biomass, having a total water requirement of $150 - 250\text{ cm}$ (represented by $200\text{ cm}$) -> (I).
• Lowland Rice (paddy) requires continuous saturation and ponding, having a seasonal water requirement of $90 - 140\text{ cm}$ (represented by $100\text{ cm}$) -> (II).
• Wheat is a winter rabi cereal requiring $4 - 6$ irrigations ($30 - 45\text{ cm}$, represented by $35\text{ cm}$) -> (III).
• Spinach (Palak) is a short-duration (30-45 days), shallow-rooted leafy vegetable requiring minimal water ($12 - 18\text{ cm}$, represented by $15\text{ cm}$) -> (IV).
  Correct match: (A)-(I), (B)-(II), (C)-(III), (D)-(IV).