Why are NPK fertilizers needed?

Related questions

1. Does Epsom salt acidify soil?
2. Are Ixora perennials?
3. How far apart should I plant ixora?
4. Can ixora grow in shade?
5. Why are my ixora leaves yellow?
6. Is Ixora a flowering plant?
7. Is Ixora fast growing?
8. How far apart do you plant ixora?
9. Can you use vinegar to acidify soil?
10. When should I prune Ixora?

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9. #phosphorus
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17. #numbers