The following submission statement was provided by /u/filosoful:

An analysis of more than 1,500 field observations has identified a collection of agricultural practices that can improve the use of nitrogen fertilizers — boosting crop yields while reducing environmental pollution.

Please reply to OP's comment here: https://old.reddit.com/r/Futurology/comments/1038a52/how_to_feed_the_world_while_reducing_nitrogen/j2xd9hr/