1. Abdel Magid H.M., Rabie R.K., Sabrah R.E.A., Abdel-Aal S.I.: The interrelationship between microbial numbers, application rate and biodegradation products of two organic manures in a sandy soil.Arch.Gulf J.Sci.Res. 14, 641–657 (1996).
2. Anderson T.H., Domsch K.H.: Ratio of microbial biomass carbon to total organic carbon in arable soils.Soil Biol.Biochem. 21, 471–479 (1989).
3. Atlas R.M., Parks L.C.:Handbook of Microbiological Media, p. 55. CRC Press, Boca Raton (USA) 1993.
4. Azo S., Sakai I.: Studies on the physiological effects of humic acid. Part 1. Uptake of humic acid by crop plants and its physiological effects.Soil Sci.Plant Nutr. 9, 1–91 (1963).
5. Bagstam G.: Population changes in microorganisms during composting of spruce bark- I. Influence of temperature control.Eur. J.Appl.Microbiol.Biotechnol. 5, 315–330 (1978).