Two tensiometers have been installed in a root profile at a... | Agrigyan

• Scope of Reference Evapotranspiration ($ET_0$):
• Represents the evaporative demand of the surrounding atmosphere independently of crop-specific traits.
• Defined for an idealized hypothetical well-watered green grass surface.
• Serves as the universal meteorological index used to compute actual crop evapotranspiration ($ET_c = K_c \cdot ET_0$).
• Conclusion: Statements (A), (B), and (C) only correctly characterize $ET_0$. (Correct answer: Option 3)

• Earthwork Calculation in Bench Terracing:

• Conclusion: Earthwork required per hectare is 10,000 m³. (Correct answer: Option 2)

• Permanent Gully Control Drop Spillway Components:
• Earthen embankment (dam/bund) directing runoff.
• Spillway inlet (headwall, cutoff wall, and weir opening).
• Conduit / spillway barrel (conveyance section).
• Outlet energy dissipator (stilling basin with baffle blocks and end sill).
• Conclusion: Statements (A), (B), (C), and (D) are all vital functional structural components. (Correct answer: Option 3)

• Statement (I) is True: In soil conservation and dryland farming, wind strip cropping utilizes strips of erosion-resistant crops alternating with erosion-susceptible crops perpendicular to the prevailing wind direction to arrest wind erosion.
• Statement (II) is False: Strip width is not fixed for all soils; rather, strip width must be narrower on coarse textured sandy soils ($6-20\text{ m}$) where wind detachment is severe, and can be broader on cohesive clay/loam soils.
• Conclusion: Statement (I) is true but Statement (II) is false (Option 3).

Correct option: (3) Statement (I) is correct but Statement (II) is incorrect.