1. Reduction in weed
2. Reduction in soil salinity
3. Reduction in soil erosion
Select the correct answer using the code given below.
Explanation
Drip irrigation is a highly efficient water-saving irrigation technique where water is directly supplied to the plant roots through a network of pipes, valves, and emitters.
Statement 1 is correct: Drip irrigation delivers water only to plant roots, preventing water wastage in surrounding soil areas. Since weeds grow in moist conditions, less water in non-target areas leads to reduced weed growth.
Statement 2 is incorrect: Drip irrigation does not reduce soil salinity. Instead it may lead to salt accumulation near the root zone over time due to limited leaching of salts from the soil. Flood irrigation is more effective in reducing soil salinity as it washes away excess salts.
Statement 3 is correct: Since drip irrigation supplies water at a slow and controlled rate there is minimal surface runoff, preventing soil erosion. Unlike traditional irrigation methods like flood or sprinkler irrigation, which cause water runoff and soil displacement, drip irrigation keeps soil structure intact.
For S1, "Drip" means water only near plants and not for weeds hence less likely weeds, likely true. For S3, Slow drip=no flow=no force= hence no erosion, likely true. This gives option C as correct.