The first one, in french, is done by an association of agricultural professionals.
They are 19 members, and write short notes, concise, very interesting.
The second one is really a website, more than a blog. This is another association, from USA, who reflects and works on genetic research and GMOs. You will find a scientific point of view, that could help you to make a more detailed analysis on the subject, without the interference of anti-globalization groups that only transmit an ideological vision of the problem.
Very interesting, although sometimes quite difficult. It is written in English.http://www.geneticliteracyproject.org/