N-balance on Fyen in 2002 and 100 % organic scenario.

Presented on BERAS Jelgava Conference 2005, Latvia,

April 6-9,Ib Sillebak Kristensen, Danish

Institute of Agricultural Science.

Table 1. Farm characteristics on Fyen in 2002.

Fyen, 2002Number of farms No 6,328Area, incl. set aside & perm. grass ha 223,376Area, incl. set aside & perm. grass ha/farm 35,3Set aside ha/farm 2,4Permanent grass ha/farm 1,3Area use of ploughed ha

Grass/clover % of ha 4%Maize & Whole crops % of ha 5%Winter cereals % of ha 41%Spring cereals % of ha 31%Beets % of ha 6%Rape % of ha 4%Other % of ha 9%

Table 2. Farm characteristics on Fyen in 2002.Net yield

Grass/clover SFU/ha 6000Permanent SFU/ha 3000

Maize & whole crops SFU/ha 8000Undersown grass/clover SFU/ha incl. G/CCereals SFU/ha 6233Peas kg/ha 3940Winter rape kg/ha 2820Total SFU/ha 6302

Table 3. Farm gate N-balances of Fyen in 2002

Units Conv. 2002Farm characteristics LSU 200.284

LSU/ha 0,90ECM milk/cow 7672

Pigs/sow 21,5Farm gate balanceInputs

Artificial fertilizer N/ha 83Net feed import N/ha 56Fixation N/ha 5Deposition N/ha 16Total inputs N/ha 160

OutputsMilk N/ha -10Meat, cattle N/ha -2Meat, pigs N/ha -28Vegetable products N/ha -13Total outputs N/ha -53

Balance N/ha 107N-efficiency % 33%

Ammonia losses % of N-surpluss 22%Ammonia losses N/ha 24Denitrication % of N-surpluss 14%Denitrication N/ha 14Nitrate leaching & soil-N changes N/ha 69

Soil-N change (- breaking down, + built up)N/ha 3Nitrate leaching N/ha 65Soil-N changes are calculated with C-tool, see www.agrsci.dk/c-tool/

Table 4. Farm characteristics on Fyen in 2002 and 100 % organic scenario.Net yield assumed % of conv

Grass/clover SFU/ha 6000 5200 87%Permanent SFU/ha 3000 1500 50%Conv. maize & org. whole cr SFU/ha 8000 3000 38%Undersown grass/clover SFU/ha incl. G/C 400Cereals SFU/ha 6233 3400 55%Peas kg/ha 3940 3128 79%Winter rape seed kg/ha 2820 1500 53%Total SFU/ha 6302 3599 57%

Table 5. Farm characteristics on Fyen in 2002 and 100 % organic scenario.

Fyen, 2002100 % org.

scenarioNumber of farms No 6.328Area, incl. set aside & perm. grass ha 223.376 223.376Area, incl. set aside & perm. grass ha/farm 35,3 35,3

Set aside ha/farm 2,4 0Permanent grass ha/farm 1,3 1,3Area use of ploughed ha

Grass/clover % of ha 4% 40%Conv.maize & org.whole cr. % of ha 5% 12%Winter cereals % of ha 41% 40% (12% not

fodder)Spring cereals % of ha 31% incl.Beets % of ha 6% 0%Rape % of ha 4% 3,2%Other % of ha 9% 5,2% =peas

Table 6. Assumptions for 100 % organic with no-import on Fyen.

Feed and area use for cattleGrass/clover & whole crop silage SFU/MPU

1)6975

Cereals SFU/MPU 1)

1302

No of cattle in herds MPU 1)

66,269No of cattle in herds LSU

2)102,067 132%

Cereals for cattle SFU 86,281,783Grass/clover, whole crop & perm. ha 116,805Area use for cattle production ha 142,182Livestock density on cattle farms on FynLSU/ha 0.72

1)

1 MPU=1 frisian dairy cow + 1.03 frisian heifer + 1 steer2)

1 LSU = 0.85 frisian dairy cow/ 0.34 heifer or steer

Fyen in total LSU in % of conv

Table 7. Assumptions for 100 % organic with 0-import on Fyen.

Feed and area use for pigs

Grass/clover & whole crop silage SFU/PU1)600

Cereals SFU/PU1)3971

Peas SFU/PU1)1346

Rapecaces SFU/PU1)382

1) 1 PU = 1 year sow + 18,7 slaugther pigsCereals for pigs etc. ha 33.565Cereals for pigs etc. SFU 114.119.854No of pigs PU 28.738

No of pigs LSU2)33.911 30%

Grass/clover & whole crop silage ha 3.316Peas ha 11.377Rape seed cakes ha 7.075Area use for pigs ha 55.333Livestcok density of pig area on cattle farmsLSU/ha 0,61

2) 1 LSU = 100 kg N from manure storage

LSU in % of conv

Table 8. Assumptions for 100 % organic with 0-import on Fyen.

Manure production % of conv dairyN-efficiency, cattle herd % 15,7% 76%N-production, cattle N/ha 104N-production, cattle on grass N/ha 36N-production, cattle in stabble N/ha 68

% of conv pigN-efficiency, pig herd % 36%1) 100%N-production, pigs N/ha 61

1) inclusive boon meel & synthetis amino acids. Not allowed in 2002, expected 35%

Table 9. Farm gate N-balances of Fyen in 2002 and 100 % org. sce. on Fyen.

Org. inUnits Conv. 2002 % of conv

Farm characteristics LSU 200.284 135.978 68%LSU/ha 0.90 0.61 68%

ECM milk/cow 7672 5540 72%Pigs/sow 21.5 18.7 87%

Farm gate balanceInputs

Artificial fertilizer N/ha 83 0Net feed import N/ha 56 0Fixation N/ha 5 66Deposition N/ha 16 16Total inputs N/ha 160 82 51%

OutputsMilk N/ha -10 -8Meat, cattle N/ha -2 -4Meat, pigs N/ha -28 -5Vegetable products N/ha -13 -7Total outputs N/ha -53 -25 47%

Balance N/ha 107 57 54%N-efficiency % 33% 30% 91%

100 % Organic

Table 10. Farm gate N-losses of Fyen in 2002 and 100 % org. sce.

Org. inUnits Conv. 2002 % of conv

Ammonia losses % of N-surpluss 22% 22%Ammonia losses N/ha 24 13 54%Denitrication % of N-surpluss 14% 14%Denitrication N/ha 14 8 54%Nitrate leaching & soil-N N/ha 69 37 54%

Soil-N change N/ha 3 3 100%Nitrate leaching N/ha 65 34 51%Soil-N changes are calculated with C-tool, see www.agrsci.dk/c-tool/

100 % Organic