Carboxyl groups have an electronegative oxygen atom double bonded to a carbon atom. This carbon-oxygen bond is very polar and the fact that its a double bond increases the polarity of the bond.
PEA agar, also referred to as Phenylethyl Alcohol Agar is a medium  used by microbiologists to grow microorganisms. The ingredient that  supplies nitrogen is casein. Making the world better, one answer at a time.
Originally Posted by HayleyB Anything that needs a higher concentrate of phosphorous as opposed to nitrogen. Peppers, chillis, cukes, squash & courgettes all while fruiting.... you mean potassium.....which is what fruiting and flowering plants like best....phosphorus is for your roots....including spuds.ckfe: have a read of this and of the other nutrient thread from Piskie right underneath it in the Growing Techniques board.... http://www.growfruitandveg.co.uk/gra...p-k_14880.html.ou can use it on beans, but brassicas prefer nitrogen rich stuff [hence the nettle tea], taters, not sure, neever used it on them but don't see why you can't.