US gov't will decide who can be a farmer and who can't

A New US law under consideration will restrict the sale of the most commonly used fertilizer for crops, ammonium nitrate to those approved by the department of homeland security.  This is in response to the Norway bombings.  Homeland security will decide who can be a farmer, who can grow their own food and who can't.  This is a terrible development threatening the sovereignty of our nation.  The ability to grow one's own food and have access to the materials required to do so is as important as the individual's right to bear arms.  it is the basic liberty of human existence, to be able to farm land that you own.   If they didn't restrict fertilizers after they were used in the oklahoma city bombing, why now