Both the peak number and peak current value of water-soluble organic substances for decomposition products of green manures varied with the incubation time and also withthe kind of greea manures.The peak number and current value were the mole and largest after 5-day incubaxion.Astragalus had more peaks and,larger current value than.ribe straw.The latter poloesed one peak after 120-day incubation,but for the former the peak and peak current tended to disappear.