Microbial biomass and activity in an agricultural soil with different organic matter contents
1985 (English)In: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 17, no 5, 611-618 p.Article in journal (Refereed) Published
Changes in soil fertility caused by various organic and N-fertilizer amendments were studied in a long-term field trial mostly cropped with cereals. Five treatments were included: (I) fallow, (II) cropping with no C or N addition, (III) cropping with N-fertilization (80 kg ha -1 yr-1), (IV) cropping with straw incorporation (1800kg Cha-1 yr-1) and N-fertilization (80 kg ha-1yr-1), and (V) cropping with addition of farmyard manure (80 kg N + 1800kg Cha-1yr-1). The treatments resulted in soil organic matter contents ranging from 4.3% (I) to 5.8% (V). Microbial biomass and activity were determined by chloroform fumigation, direct counting of fungi (fluorescein diacetate (FDA)-staining and Jones-Mollison agar-film technique) and bacteria (acridine orange staining), most probable number determinations of protozoa, esterase activity (total FDA hydrolysis) and respiration. Both biomass estimates and activity measurements showed a highly significant correlation with soil organic matter. Microbial biomass C ranged from 230 to 600 μg C g-1 dry wt soil, as determined by the fumigation technique, while conversions from direct counts gave a range from 380 to 2260 μg C. Mean hyphal diameters and mean bacterial cell volumes decreased with decreasing soil organic matter content.
Place, publisher, year, edition, pages
Elsevier, 1985. Vol. 17, no 5, 611-618 p.
IdentifiersURN: urn:nbn:se:oru:diva-52193DOI: 10.1016/0038-0717(85)90036-7ISI: A1985AQX4200003ScopusID: 2-s2.0-0022192877OAI: oai:DiVA.org:oru-52193DiVA: diva2:971022