`In China wird am meisten Reis angebaut' is correct. 'am meisten' (viel/mehr/am meisten = much/more/most) refers to the word which follows. In 'In China wird Reis meistens angebaut' 'meistens' is used as an adverb and refers to 'angebaut'. In the active sentence 'am meisten' is used as an adjective and refers to 'Reis'.

where i was born and learned my german, we never say " ... am meisten in china... " it sounds strange, like you made up your mind during your speech. but of course, thats only in austria, no kangaroos... as far as i know in german the ordering is not so important, so basically both versions are correct from the grammatical point of view, but as a native german speaker i would say it as "In China wird am meisten Reis angebaut."

None of the above are correct. So here it is: Reis wird am meisten in China angebaut. Since the most rice is grown in China the correct word order is:....am meisten in China......

In China wird am meisten Reis angebaut. <- means china grows the most rice In China wird meistens Reis angebaut. <- means in china rice is the main crop, that is grown.