state gov OPSC Assistant Agriculture Officer Mock Test 2024 Agriculture and Rural Development Soil and Water Conservation Major Soil Types

निम्नलिखित में से कौन सा प्राथमिक वृहत-पोषक तत्व है?

1

C, H, O

2

N, P, K

3

Ca, Mg, S

4

यूरिया

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