It discovered that in seven of the 12 categories farmers using GM crops had to add the same quantities of pesticides to their fields as those growing non-modified crops.
(the 12 categories farmers; using; GM crops) (It; discovered; that in seven of the 12 categories farmers using GM crops had to add the same quantities of pesticides to their fields as those growing non-modified crops)
the 12 categories farmers It
using discovered
GM crops
that in seven of the 12 categories farmers using GM crops had to add the same quantities of pesticides to their fields as those growing non-modified crops