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Context: Mae dilyn arferion ffermio dwys mewn rhai ardaloedd wedi arwain at ganlyniadau negyddol tebyg. Mae gwella lefelau cynhyrchiant trwy ddefnyddio gwrteithiau artiffisial, chwynladdwyr a newid o dyfu gwair i silwair wedi arwain at dir pori llwm ei rywogaethau, o dan drwch o rygwellt a meillion gwyn.
