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38. Rhaid i unrhyw berson sy’n defnyddio samplu a dadansoddi i ganfod maint y nitrogen mewn tail organig gadw’r adroddiad gwreiddiol gan y labordy.
Gwybodaeth Cychwyn
I1Rhl. 38 mewn grym ar 1.4.2021, gweler rhl. 1(3)