Organic matter accumulation and fertilizer-induced acidification interact to affect soil microbial and enzyme activity on a long-term sugarcane management experiment

• Published in: Biology and fertility of soils 2005-05, Vol.41 (4), p.249-256
• Main Authors: Graham, M.H, Haynes, R.J
• Format: Article
• Language: English
• Subjects: Acidification; Agronomy. Soil science and plant productions; Ammonification; Biochemistry and biology; Biological and medical sciences; Chemical, physicochemical, biochemical and biological properties; community structure; Crop management; Crop residues; Enzymatic activity; enzyme activity; Enzymes; Fertilizer application; Fundamental and applied biological sciences. Psychology; Microbial activity; Microbiology; Mineralization; Organic matter; Physics, chemistry, biochemistry and biology of agricultural and forest soils; Saccharum officinarum; Soil acidification; soil enzymes; soil microorganisms; soil respiration; Soil science; Soil surfaces; Soils; Sugarcane
• ISSN: 0178-2762; 1432-0789
• DOI: 10.1007/s00374-005-0830-2

The effects of crop residue management and fertilizer applications on the size and activity of the microbial community and the activity of exocellular enzymes involved in mineralization of C, N, P and S were examined on a long-term (60 years) field trial under sugarcane situated at Mount Edgecombe, South Africa. Treatments at the site included pre-harvest burning with harvest residues removed (B), burning with harvest residues (unburnt tops) left on the soil surface (B^sub t^) and green cane harvesting with retention of a trash blanket (T). Plots were either fertilized annually with N, P and K or unfertilized. The size and activity of the microbial community and the activity of soil enzymes assayed increased with increasing inputs of crop residues (B < B^sub t^ < T) and this effect was evident to a depth of 30 cm. The metabolic quotient was decreased by inputs of both crop residues and fertilizers. Annual fertilizer additions did not affect basal respiration, increased fluorescein diacetate (FDA) hydrolysis rate and acid phosphatase, invertase and protease activities and decreased arginine ammonification rate and dehydrogenase, alkaline phosphatase, arylsulphatase and histidase activities. These effects were attributed to an interaction between the positive effect of fertilizer in increasing the size of the microbial biomass and the negative effect of fertilizer-N-induced soil acidification on microbial activity and on the activity of exocellular enzymes. Such results demonstrate the importance of using a range of measurements of microbial and enzyme activity when determining the effects of management on soil microbial and biochemical properties.[PUBLICATION ABSTRACT]