Correct answer: (c) 1,3 and 4 only
Explanation
- A
1, 2 and 3 only
1, 2 and 3 only. Rock phosphate does not fertigate well (insoluble).
- B
1, 2 and 4 only
1, 2 and 4 only. Same rock-phosphate miss.
- 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.
- 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.
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