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Practical Approaches for EB:txtive E & 5 Coawl - 92 <br />significantly higher than the amount of nitrogen needed for decomposition, the <br />nitrogen is drawn from the soil, which thus depletes the arrlount of nitrogen <br />available for plant growth. To offset this imbalance, additional fertilus 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 procedure. Ntmgen depletion in the soil is evidenced by a necrosis, <br />or 'yellowing' of platltr. the C.•N ratio for straw is generally considered to be <br />15:1, velure wood frber, such as curled aspen is somewhere arotutd 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 plane <br />through chemical weathering or decomposition. <br />Where fertility is part of the BMP system, consideration should be given to the <br />amount of nutrienu available and whether they are availak~le for a short term, <br />long term and whether they are temperature dependant or volatilize off, malting <br />them unavailable for plant uptake. <br /> <br />OPERATION <br />MO Maintenance <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 Requiremenu <br />Where vegetation is part of the erosion control system, additional fertilizer <br />inpuu 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 shoou or roou. <br />m 1995 fECA <br />