Free, Homemade Liquid Fertilizer Make these easy liquid fertilizers from grass clippings, manure and urine — then sit back and watch your seedlings and plants thrive!

I also use them to make a nitrogen-rich liquid plant feed, which is particularly beneficial to leafy, nitrogen-hungry crops. The nettles bioaccumulate a range of other macro and micro plant nutrients.

Disadvantages of organic liquid feed can include a higher cost than conventional fertilizers and potential complications such as the plugging of drippers. Yet with a typical North American greenhouse ...

A little electricity, it turns out, can transform the waste gas into raw material for making plastic bottles, antifreeze, fuel, and more. Take Liquid Light , profiled in this New Scientist piece .