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• Practical Approac~or Effective E & S Coowl - 92 <br />' significantly higher than the amount of nitrogen needed for decomposition, the <br />nitrogen is drawn from the soil, which thus depletes the amount of nitrogen <br />' available for plant growth. To offset this imbalance, additional fertilizer with <br />elevated nitrogen must be added as a soil amendment. <br />Field Notes: The C.•N ratio of most materials can be determined by standard <br />laboratory proeedwe. Nitrogen depletion in the soil is evidenced by a necrosis, <br />or 'yellowing' of plane. The C:N ratio for straw is generally considered to be <br />' IS:1, where wood fiber, such as cwled aspen is somewhere around 70:1. <br />' F Fertility Value <br /> Some BMP materials and/or systems incorporate fertilizer into the process of <br />application or into the product directly, where it becomes available to plants <br /> through chemical weathering or decomposition. <br /> Where fertility is part of the BMP system, consideration should be given to the <br /> amount of nutrients available and whether they are available for a short term, <br /> long term and whether they are temperature dependant or volatilize off, making <br /> them unavailable for plant uptake. <br /> <br />OPERATION <br />' MO Maintenapce <br />Regardless of the BMP selected, some routine follow-up is required: All <br />' erosion and sediment control practices have the potential need for maintenance <br />(particularly those used for sediment control). It has been this author's <br />experience that the cost of routine maintenance is seldom considered in erosion <br />' control planning and is usually the chief cause for failure of an erosion control <br />system. <br />FO Additional Fertility Requirements <br />' Where vegetation is part of the erosion control system, additional fertilizer <br /> inputs and or overseeding may be required to maintain a vigorous plant <br />' population necessary for effective cover and erosion control. Included in this <br />component might also be the need for pesticide applications to inhibit fungal, <br /> microbial or insect predation on the plant shoots or roots. <br /> <br />' O 1995 IECA <br />