What are the advantages of fertigation in agriculture?1.Controlling the alkalinity of irrigation water is possible.2.Efficient application of Rock Phosphate and all other phosphatic fertilizers is possible.3.Increased availability of nutrients to plants is possible.4.Reduction in the leaching of chemical nutrients is possible.Select the correct answer using the code given below:

1. A

   1, 2 and 3 only

   1, 2 and 3 only. Rock phosphate does not fertigate well (insoluble).

2. B

   1, 2 and 4 only

   1, 2 and 4 only. Same rock-phosphate miss.

3. C

   1,3 and 4 only

   1, 3 and 4 only. You can manage irrigation-water pH/alkalinity, raise nutrient availability, and cut leaching. Insoluble rock phosphate is the miss.

4. D

   2, 3 and 4 only

   2, 3 and 4 only. Keeps rock phosphate.

Summary. Official key is (c) 1, 3 and 4 only. Fertigation: dose through drip, better availability, less leaching, some control of water chemistry. Rock phosphate is not a drip-friendly soluble fertiliser.