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Sent By: CANCN CITY FSC; • 484 - 2 When mulching with wood produuKS such as wood chips, hark, w shavings or other wend materiels, apply [o a 2-idch Thickness if the evil is not vrell• drained, and to a 3 to flinch thir*ness if drainage is good. Mare finely textured mulches, which allow less oxygen peneba[ion than coarser materiels, should be no thicker than 1 or 2 inches. The mulct matarinl shall provide no greeter than 80 percent ground cover h order tv ensure adequate air movement. Gravel or other incrganic material shall be aDPliad approximately 2 Inches thick end shell consist of pieces 0.76 tq 2 inches m diameter. The mulch materl8l shalt provide na mare than 9o percent ground cover in order 10 ensure adequate air movement. Additional Criteria to Buooreaa Wead Growth The thldcness of mulch will be d6tarmined by the size of the plant Deirg mulched. Smell plants must not be smothered. Muldras shah ba kept clear of the stems o4 plants where disease !s likely to ocwr. Mulches ap(Aied around growing plania or prior to weed seedling development shall have 100 percent gmunU cover. Tticknesa of the mulch shall be adequate to prevent emergence of targaied weeds. PtasNc mulches may be used. Atltlltlonal CAterla to Establish Veaetatlve Cover Mulch shalt ba apD48d at a rate that aCAi¢ves 50 percent ground rover to provide protecaon from erosion and runoffand yet aibw adequate tight and air penetration io the seedbed to ensure proper germinabon, emergence, and disease slq>pressuwn. Additional Criteria to Improve Soll Cendlllon and Inc~asae Soil Fertility To increase soil fertility, apply mulch materials with a carbon to nitrogen ratio {C:N) less than 30 to 1 such as animal manure, bio-soGda, toed processing wastes, or similar materiels. Apply other practices such as contouring, fitter stripe a dpadan iorost butlers to assure that runoff from rho mulched areas will not trenspod mulching materials to sensitive walerbodies. ~DO not apply mulch with C:N k+ss than 20:1 to the area of designed flow in watercourses. 3019; ~pu' Credtt nutrients applied with the mulch to the nutrient budget. llse the Sd! Condkbning Ind¢x to assn-ss soi: quality impacts. coNBIDERATIONS Page 5!6 Consider the eflacts of mulching on avaporatlon, infltration and runoff. Mulch material may affect mlcobiel activity in the soil surface, increase Inflttratlon, and decease runoff, erosior. and evaporation. Increased infdtratlan may Increase nutrient and chamicat trenspon Oefow the root zone. The temperature of the surface runoff may also be bwered. Mulched soil retains moisture, requites less watering and decreases the stance of water stress on plant materials. Mulch also minimizas evaporation from the adl surface and hence reduces bases from bare soil areas. Mulch materials high m organic matter with a high water hokfing capacity and ~tlgh aripermeabaity to water droplets may atlversay stied the water needs of plants. Clear and+nfra-red trensmisaide (IRT) plastic have ttte greatest weaning potential. They are transparent to inooming radiation end trap the longer wavelengths radiating from the suit. Black mulches ere limited to warming soils by conduction only and are less et'fautive. Clear rtv.lkhaa aibw Drofusa weed growth and may negate fire benefits of soil wamnirrc~. Biadr mulches provide efteelfve weed rantrd. Wavelength selective (IRT) bWnds the soil wsmdng characteristics of clear mulch with the weed wntroi abikty of plack mulch. Consider potential toxic aaopathic effects that mubh material may have on other organisms. Animal and plant pest species may be incompatible wah the site. Consider the potential Por intxeasad paihogenic activity wHhln the applied mulch material. Keep mulches 3 to 6 inches away from p'.ant stems end crowns to prevent disease and peal problems. Deep mulct+ provides nesting habitat for grpund- burrowing rodents that can chew extensively on bark on tree trunk andtor tree roots. Light mulch applied char the first cold weather may prevent rodents from nesting. NRGS, CO April 2003: