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Fact Sheet No. 4 For Dairies -4- The following table can be used to identify the nitrogen needs of specific crops. The nitrogen requirement values are primarily taken from the Western Fertilizer Handbook(8th Edition, 1995)that also lists other crops and nutrients in addition to nitrogen. The county Farm Advisor may be able to provide requirements for specific crop varieties. TABLE 3: NITROGEN REQUIREMENTS FOR CERTAIN CROPS CROP YIELD(tons) LBS.N PER ACRE CROP YIELD(tons) LBS.N PER ACRE Alfalfa 8 480 Oats 1.6 115 Almonds 1.5 200 Orchard ass 6 300 Barley 2.5 160 Prunes 15 90 Bermuda ass 4 225 Safflower 2 200 Brome rass 5 220 Sor hum-sudan 8 325 Clover-grass 6 300 Sugar Beets 30 255 Com(grain) 5 240 Tomatoes 30 180 Com(silage) 30 250 Timothy 4 150 Cotton lint 0.75 180 Vetch 7 1 390 Grain sorghum 4 250 Wheat 3 175 Using information obtained from Table 3 or other sources,the nitrogen requirements for cropland at a dairy can be calculated as shown in Table 4. TABLE 4: CROPLAND NITROGEN RE UIREMENTS Field Number Nitrogen Needs lbs.N/acre)' Field Total lbs.N per Field or Name First Crop Second Crop Third Crop Total N Acres (Field Acres x Total N) IFI-1) i 400 400 31. 7 /5 Z/ rELD Z400 2 [0 0 FrE�a 22.3 512 iEt- 230 23o s.lo 5 00 FrE�O 5 30 — Z o 12.4 2852 rFco 60 2 5• 13 3 CnnlT/NU ED ON^iExTFAy>c Total Acres 'Notal N(lbsdyear)''� Evaluation of Nutrient Requirements: Using the total pounds of nitrogen available value from Table 2 and the total nitrogen requirement value from Table 4, an initial determination can be made as to the relationship between nitrogen availability and nitrogen need and whether or not it is necessary to export manure or to import fertilizer. As with any farming operation, periodic measurements of nitrogen in cropland and/or crops should be made in order to better determine nutrient requirements for optimum yield. Developing the Nutrient and Irrigation Water Management Plan: A summary of the nitrogen availability and nitrogen need values and of the decision on exporting manure or importing fertilizer is the basis for the nutrient management plan. Although nitrogen is usually the nutrient of concern at confined animal facilities because of the potential for impacts to water quality, other nutrients should also be considered. Other information that may be included in the nutrient management plan includes a determination of the cropland characteristics and a description of when and how the manure and wastewater will be applied to cropland. The information on when can be presented in relation to crop planting and growth. The information on how can be related to the Water Pollution Prevention Plan, Stormwater Management Plan, or other document(s)related to waste and water management. The relationship of cropland characteristics to irrigation water management should be considered when developing a NIWMP. The cropland characteristics that should be addressed in the NIWMP include the depth to groundwater, soil type(s), field dimensions and topography, irrigation method(s), drainage controls, and annual rainfall patterns. ° From Table 3 or equivalent source. May be adjusted for crop yield. Fs-#4d.doc