Sheet1 - Scholar - Virginia Tech

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					                                                                       CropNP

    Katharine Knowlton, Assistant Professor                                                                                       Greg Bethard, Dairy Specialist
               Department of Dairy Science                                                                                            Monsanto Dairy Business
                              Virginia Tech

Input

Herd Information                           units                                    Crops                               %1              nutrient uptake, lbs/acre
        Number milking cows              cows/day            100                                                                    nitrogen phosphorus potassium
        Dry matter intake                 lb/day           45.00                Corn silage                           50.0               200              80      150
        Diet crude protein               % of DM           17.00                Alfalfa silage                        25.0               180              40      200
        Diet phosphorus content          % of DM             0.4                Pasture                                0.0                70              25       80
        Milk yield per day                lb/day              80                Orchardgrass hay                       0.0               300           100        110
        Milk protein                        %               3.20                Small grain silage                    25.0               177              17       66
        Milk fat                            %               3.50                    Nutrient Losses                   units
        Diet DM digestibility               %                 70                Volatization and denitrification    lbs/acre             40
        Average daily BW gain             lb/day             0.2                Surface and groundwater             lbs/acre             50              4         6
        Calving Interval                  months            13.0                Storage 2                           lbs/acre
        Average BW of calves                lb                80                    N, P, and K Fractions            units          nitrogen phosphorous potassium
        Calves born/year                   head               92                Concentration in diet               % of DM              2.72       0.40      1.00
                                                                                Concentration in milk                  %                 0.50       0.10      0.15
        **Red numbers are constants and can be changed                          Concentration in BW gain               %                 1.20       0.70      0.20
        **Blue numbers must be entered for your herd                            Concentration in calf BW               %               88.00        0.83      0.22
                                                                                1
        **Black numbers are formulas and should not be changed                      % of manure applied to each crop
                                                                                2
                                                                                    building up deficient soils



                                                                                                   Crop Reference
Output                                                                                             Other crops                         nutrient uptake, lbs/acre
Daily balance per cow                      units         nitrogen phosphorus         potassium                                      nitrogen phosphorus potassium
        Input                             lb/day              1.22       0.18              0.45    Corn grain, stover left               135         53         40
        Export - milk yield               lb/day              0.40       0.07              0.12    Bermudagrass hay                      235         27        175
        Export - daily BW gain            lb/day          0.0024      0.0014            0.0004     Sorghum silage                        192         39        150
        Export - calves                   lb/day          0.1780      0.0017            0.0004     Bluegrass hay                          60         20         60
        Difference (input - exports)      lb/day            0.647      0.104             0.329     Soybeans                              150         35         57
        Yearly manure output               lb/yr          23,607       3,784            12,014     Orchardgrass hay                       80         30        110
Dry Matter                                 units                                                   Alfalfa hay                           180         40        180
        Input (DMI)                       lb/day             45                                    Bahiagrass hay                        200         25        145
        Output, feces                     lb DM           13.5                                     Elephantgrass hay                     499        100      .
        Output, urine                     lb DM             2.3                                    Corn silage                           204         41        150
        Total DM output/d                 lb DM           15.8                                     Small grain silage                    177         17         66
        Manure DM output, % of input        %                35                                    Mixed grass pasture                    70         25         80
        Manure DM/yr                       lb/yr       574,875                                     Alfalfa haylage                       345         35        200
        Manure organic matter/yr           lb/yr       477,146                                     Corn for grain, incl. stover          235         90        185
        Wet Manure/yr @ 14% DM             lb/yr     4,106,250                                     Red Clover                            100         25        100

Nutrient Recoveries                        units     nitrogen      phosphorus       potassium
        % recovered of excreted             %            65           100               75
Crop Application Rates
        Corn silage                       lb/acre     290             84               156
        Alfalfa silage                    lb/acre     270             44                76
        Pasture                           lb/acre     160             29                86
        Orchardgrass hay                  lb/acre     390             104              116
        Small grain silage                lb/acre     267             21                72
Acreage Needed                             units     N basis        P basis          K basis
        Corn silage                        acres      26.5           22.5             28.9
        Alfalfa silage                     acres      14.2           21.5             29.6
        Pasture                            acres       0.0            0.0              0.0
        Orchardgrass hay                   acres       0.0            0.0              0.0
        Small grain silage                 acres      14.4           45.0             31.3
        Total                             acres          55           89               90

				
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posted:11/25/2011
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