• Keller and Karmeli Drip Emission Uniformity Formula:
• The field emission uniformity ($EU$) of a drip/trickle irrigation subunit is given by:

where:

• $C_v$ is the manufacturer's coefficient of emitter variation
• $n$ is the number of emitters per plant/emission point
• $q_n$ is the average of the lowest quarter (25%) of emitter flow rates
• $\bar{q}$ is the average flow rate of all sampled emitters
• Conclusion: Matches Option 2.

Correct option: (2) 100(1.0 =) 127Cy, da

• Leaching Requirement (LR) in Salinity Management:
• The Leaching Requirement ($LR$) is the fraction of applied irrigation water that must pass through the crop root zone to prevent soil salinity from exceeding a specified threshold:

where:

• $D_d$ = depth of drainage water percolating below root zone
• $D_i$ = depth of applied irrigation water
• $EC_{iw}$ = electrical conductivity of the irrigation water
• $EC_{dw}$ = electrical conductivity of drainage water at bottom of root zone
• Conclusion: Option 1.

Correct option: (1) Option 1