Essential elements for rice
○ Major elements : 9
- C, H, O, N, P, K ,Ca, Mg and S
○ Minor elements : 7
- Fe, Mn, Cu, Zn, Mo, B and Cl
○ Elements most commonly applied by farmers
- N, P, K
○ Elements occasionally applied by farmers
- Z, S
○ All other essential elements
-provided by air, water, soil, plant residues, etc
○ Silicon is applied to degraded soil
- Korea, Japan, Taiwan
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