Biogas residue parameterization for soil organic matter modeling

Isotopic ((13)C) fractionation during plant residue decomposition and its implications for soil organic matter studies.

Carbon isotopic fractionations in plant materials and those occurring during decomposition have direct implications in studies of short-and longer-term soil organic matter dynamics. Thus the products of decomposition, the evolved CO(2) and the newly formed soil organic matter, may vary in their (13)C signature from that of the original plant material. To evaluate the importance of such fraction...

Crop residue management and fertilization effects on soil organic matter and associated biological properties.

Returning crop residue may result in nutrient reduction in soil in the first few years. A two-year field experiment was conducted to assess whether this negative effect is alleviated by improved crop residue management (CRM). Nine treatments (3 CRM and 3 N fertilizer rates) were used. The CRM treatments were (1) R0: 100 % of the N using mineral fertilizer with no crop residues return; (2) R: cr...

Role of Mineral-Nitrogen in Residue Decomposition and Stable Soil Organic Matter Formation

of plant residue C and N. Application of 15N-labeled fertilizer or maize residue together resulted in more than The role of mineral fertilizer-N inputs and N deposition to agricultwice as much 15N recovered from fertilizer than from tural and natural ecosystems can affect plant residue decomposition and soil C processes. Yet it is still unclear whether residue-N or residue in the SOM (Dourado-N...

Investigating the Effect of Soil Organic Matter on Gypsum Block Calibration for Measuring Soil Volumetric Moisture Content

Continuous soil moisture assessment and evaluation is essential for irrigation management and planning. One of the common methods for measuring the moisture content of the soil is the use of a gypsum block. The use of gypsum blocks in some cases, including the presence of organic matter in soil, may cause an error in the measurement of moisture. For this purpose, a laboratory study was conducte...

GRDC Project No CSO 00029 Residue Management, Soil Organic Carbon and Crop Performance - Functions of Soil Organic Matter and the Effect on Soil Properties