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Table 1. Nitrogen(N)fertilizer characteristics <br /> Acidification <br /> Equivalent potential(Ib pure <br /> Percent- Ib fertilizer lime(CaCO31 to <br /> Nitrogen age for 1 Ib Advantages and neutralizejerdlizer <br /> Form product nitrogen nitrogen* disadvantages per lb nitrogen) <br /> Gas Anhydrous 82 1.22 (a)In irrigation water:fertilizer 1.80 <br /> ammonia distribution is only as uniform as water <br /> penetration down furrow runs;some <br /> ,r surface losses into air.(b)Soil <br /> injection:some loss if soil is trashy, <br /> cloddy,dry,or sandy.Special <br /> equipment required for application. <br /> Dry Ammonium 21 4.76 Acid residue suitable for alkaline soils 5.24 <br /> sulfate but is undesirable in acid soils. <br /> Ammonium 33.5 2.98 High N analysis;half immediately 1.82 <br /> nitrate available as nitrate and half delayed as <br /> ammonia. <br /> i <br /> Calcium 15.5 6.45 Immediately available and no soil 1.29" <br /> nitrate surface volatilization loss.Contains <br /> 19%calcium;non-acidifying.Higher <br /> cost per lb N than other dry forms. <br /> Urea 46 2.17 Highest N analysis;cost competitive. 1.56 <br /> ` Liquid Aqua 20 5.0 Has lower free ammonia than 1.80 <br /> ammonia (0.66 gal) anhydrous and requires less expensive <br /> application equipment.Direct soil <br /> injection need not be as deep as with <br /> y„ anhydrous. <br /> CAN-17 17 5.92 Contains two N forms=-8%calcittm; 0.53 <br /> (calcium (0.47 gal) low acidification potential. <br /> tL <br /> ammonium <br /> nitrate) <br /> UAN-32 32 3.12 High N analysis.Contains three N 1.78 <br /> (urea (0.28 gal) forms to extend availability. <br /> ammonium <br /> !� <br /> nitrate) <br /> L Urea 23 4.37 Can be cost competitive. 1.56 <br /> solution (0.46 gal) <br /> a Ammonium 20 4.98 Contains two N fomes;half 1.82 <br /> nitrate (0.47 gal) immediately available and half <br /> solution delayed. <br /> L 'Multiply pounds elemental N desired per acre(or kg n/ha)by this factor to also determine pounds of fertilizer per acre(or <br /> kg fertilizer/ha).Example:50 Ib N/acre(56 kg N/ha)of ammonium sulfate. 50 x 4.76=238 lb fertilizer/acre(56 x 4.76= <br /> 267 kg fertilizer/ha). <br /> =Provides a basic residue as lime rather than an acid residue. <br /> Grape Notes # January 2002 # Page 4 <br /> L <br /> L <br />