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F rtiGzer suggestions for revegetation of disturbed lands <br />of I~ to ZO soil cores taken fiom a uniform soil area <br />Sample separately areas with major differences in soil <br />properties. <br />Thoroughly do all soil samples within 12 hotrrs after <br />sampling by spreading the soil on clean paper or any <br />other clean surface where the soil will not be <br />contaminazed. Do not oven dry the soil because this will <br />change the soil test results. Ship the airdried soil in a <br />clean sample container to the soil test laborazory. <br />Submit a carefully completed information sheet with <br />the soil sample. This form provides information so <br />fertilizer applicazion suggestions can be tailored to each <br />specific situation. <br />Mote detailed explanations of the importance of <br />taking proper soil samples are found in 0.500 Soil <br />sampling -key to quality fertilizer recommendations, <br />0.501 Soi! testing for jertifi:er recommendations, and <br />0.502 Soil rest explarratlan. These fact sheets are <br />available at your Colorado State University Cotmty <br />Extension office or from the Cooperative Extension <br />Resource Center, 115 General Services Building, <br />Colorado State University, Fort Collins, CO 80523 (970- <br />491-6198). <br />The Colorado State University Sail, Water, and Plant <br />Testing Laboratory is located in Room A319, Natural and <br />Environments! Sciences Building, Colorado State <br />University, Fort Collins, CO 80523 (970-391-5061). <br />Nitrogen Suggestions <br />Adequate available N is very important in the <br />establishment of any vegetation. Most disturbed lands <br />may not contain adequate available N because of mixing <br />of subsoil materials with the previous topsoil. Therefore, <br />application of az least 10 Ib of N/A is generally <br />recommended, with higher N rates suggested for soils <br />containing low levels of N0,-N (Table 1). Broadcast and <br />incorporate N fertilizers to a depth of 6 top 12 inches into <br />the surface soil prior to planting. Organic sotuces of N, <br />such as manures and biosolids, are desvable N fertilizer; <br />because of their slow-release nature and also that they <br />add organic matter to the surface soil layer. <br />Table 1: Suggested broadcast nitrogen rata for atablishmeot <br />of vegetation on disturbed lands, ss related to NO,-K <br />conceatratioos in soil. <br />ppm NO,-N in soil F~ilizer rate, Ib N/A <br />0 - 10 40 <br />l 1 - 20 20 <br />Page 2 <br />Phosphorus Suggestions <br />Applied P generally enhances seedling establishment <br />on soils with low or medium levels of extractable P. <br />Suggested broadcast P rates (Table 2) are based on soil <br />test levels. The main soil tests for extractable P in <br />Colorado soils are the AB-DTPA an~i sodium bicarbonate <br />(NaHCOr) tests, and values for both tests are included. <br />These two soil tests are rued mainly for neutral and <br />calcareous soils. If soils are acid, the Bray P, soil test <br />generally is used. Values for the Bra/ P, soil test also are <br />included in Table 2. <br />Table 2 suggests P rates for revegetation of disturbed <br />lards. Broadcast and incorporate phosphaze fertilizers to a <br />depth of 6 to 12 inches into the soil prior to planting to <br />assist in scedling establishment. Place;went of P fertilizers <br />in the root zone is important bceatue P is not mobile in <br />soil. Organic mazerials such as manm~s and biosolids <br />also can provide significant amounts of P. <br />Table 2: Suggested bmadwst phosphorus rata for <br />establishment of vegetation on dtstttrbed lands <br />ppm P in soil <br />Relative Fertilizer rate, Lb <br />AB-DTPA Nai-ICO, Btay P,• level P:O,/A <br />0-3 0- 6 0.6 low 60 <br />4 - 7 7 - 14 7 - 20 medium 30 <br />> 7 > 14 > 20 high <br />Potassium Suggestions <br />Most Colorado soils ate relaziveh~ high in extractable <br />K, so few responses of grasses to K lertilizers have been <br />reported. Suggested K rates related to soil test values <br />(AB-DTPA or NH,OAc) are in Table 3. The main K <br />(potash) fertilizer is KCI. If required, broadcast and <br />incorporate K fertilizers to a depth of 6 to 12 inches into <br />the soil with phosphate fertilizers. Some exposed subsoil <br />mazerials with high levels of extractalde K may not <br />provide strliicient K for establishing new vegetation, <br />especially if organic amendments were not included. For <br />these soils broadcast and incorporate K fertilizer az a rate <br />of 40 Ib IC,O per acre. <br />> 20 10 <br />