Which of the following is/are the advantage/advantages of practising drip irrigation? 1. Reduction in weed 2. Reduction in soil salinity 3. Reduction in soil erosion Select the correct answer using the code given below.

Drip irrigation is the correct answer because it delivers water directly to the plant's root zone, keeping inter-row spaces dry to suppress weed growth (1) and eliminating surface runoff to significantly reduce soil erosion (3). Statement 2 is incorrect because drip irrigation can actually lead to localized salt accumulation at the edges of the wetted zone, as it lacks the high water volume required to leach salts deep into the soil profile. The core concept being tested is the efficiency and environmental impact of micro-irrigation techniques in precision agriculture.