1. Bird guano contains
2. Fertilisers contain one or more
3. Which epipedon is not common in India?
4. Critical concentration (ppm) of Zn in case of DTPA extract is
5. Urea has chemical composition
6. Which of the following nutrient elements is responsible for the dieback of citrus?
7. With increase in base saturation, soil pH
8. A fertilizer is having 20-10-10 Fertilizer Grade, what will be it's Fertilizer Ratio?
9. The vertical section of soil, which shows different horizons, is called
10. A soil layer of maximum leaching is indicated by the symbol of
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