Can beer bottle caps green Africa?

Beer bottle tops 'make ideal measuring pots for "micro-dosing", a technique that lets farmers focus precious nutrients where they are needed rather than wasting them. The results so far are encouraging… Steve Twomlow of the International Crops Research Institute for the Semi-Arid Tropics (ICRISCAT), based in Bulawayo, Zimbabwe, established that about 5 grams of ammonium nitrate is enough to feed three plants: That’s one beer cap full. Conventional scattering of fertilizer uses five capfuls for every three plants…'

That is Treehugger reading New Scientist. More from the African Fertilizer Summit. Though remember, beer bottle tops can also be used as a currency.