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

1. Reduction in weed — Correct. Drip irrigation applies water only near the root zone, so the surrounding soil remains relatively dry and weed growth is reduced.

2. Reduction in soil salinity — Incorrect. Drip irrigation is generally useful in saline conditions and can help manage salt build-up locally, but it is not typically stated as reducing soil salinity overall; salts may even accumulate at the wetting front.

3. Reduction in soil erosion — Correct. Water is delivered slowly and directly to the soil, minimizing runoff and therefore reducing soil erosion.

Hence, 1 and 3 only are correct.