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mae a wnelo'r cyntaf â'r rhai sy'n tyfu cnydau na roddwyd cymorth iddynt yn y gorffennol , yn arbennig cnydau fel mwyar duon , gan y bydd ffermwyr mwyar duon yn aml yn cylchdroi bob 10 mlynedd fwy neu lai , drwy dyfu cnydau y rhoddir cymorth ar eu cyfer
the first relates to those who grow crops that have previously been unsupported , in particular crops such as blackberries , because blackberry farmers will often rotate every 10 years or so , by growing crops for which support is provided