Agriculture Reference
In-Depth Information
5.2.1.6
C/N Ratio
The C/N is important in determining in general terms the rate of decomposition of
organic materials. High C/N ratios make the process very slow as there is an excess
of degradable substrate for the microorganisms. But with a low C/N ratio there is an
excess of N per degradable C and inorganic N is produced in excess and can be lost
by ammonia volatilization or by leaching from the composting mass. Then, low C/N
ratios can be corrected by adding a bulking agent to provide degradable organic-C.
5.2.2
Advantages and Disadvantages of Composting
The advantages of composting organic waste materials with direct application are
summarized below:
• Elimination of pathogens and weeds.
• Microbial stabilization.
• Reduction of volume and moisture.
• Removal and control of odours.
• Ease of storage, transport and use.
• Production of good quality fertilizers.
However, the disadvantages are:
• Cost of installation and management.
• Requirement for a bulking agent.
• Requirement for large areas for storage and operation.
5.2.3
Benefits of Composting
The benefits of composting can be divided in to two groups: to improve crop pro-
ductivity and profitability; and to improve soil quality.
Improve crop performance and lower production costs through:
• Improved yields, product quality and storage life
• More efficient and reduced use of fertilizers and pesticides, including soil fumi-
gants
• Better utilization of irrigation
• Increased crop resistance to pests and diseases.
Improve soil quality through:
• Better organic matter levels and organic cycles
• Increased available water to plants
• Increased nutrient availability and nutrient-holding capacity
• Improved structure
• Reduced soil-borne plant pathogens and pests
Search WWH ::




Custom Search