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.
To reduce the effects of too much nitrogen, plant peas with a heavy feeding companion such as corn or asparagus. Peas will continue to produce nitrogen, which will be quickly absorbed by the companion plant, improving the overall health of both plants and the soil microbes working to make the nitrogen available.oil Drainage. Peas do not like to sit in wet soil, so choose a spot with good drainage. If you have heavy clay soil, which absorbs and holds water, add humus materials to improve drainage. Working leaves, grass clippings or straw into the soil will improve soil texture, drainage and nutrient content.