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Table 1. Farm characteristics on Fyen in 2002.

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  1. 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.

  2. Table 1. Farm characteristics on Fyen in 2002. Fyen, 2002 Number of farms No 6,328 Area, incl. set aside & perm. grass ha 223,376 Area, incl. set aside & perm. grass ha/farm 35,3 Set aside ha/farm 2,4 Permanent grass ha/farm 1,3 Area 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%

  3. Table 2. Farm characteristics on Fyen in 2002. Net yield Grass/clover SFU/ha 6000 Permanent SFU/ha 3000 Maize & whole crops SFU/ha 8000 Undersown grass/clover SFU/ha incl. G/C Cereals SFU/ha 6233 Peas kg/ha 3940 Winter rape kg/ha 2820 Total SFU/ha 6302

  4. Table 3. Farm gate N-balances of Fyen in 2002 Units Conv. 2002 Farm characteristics LSU 200.284 LSU/ha 0,90 ECM milk/cow 7672 Pigs/sow 21,5 Farm gate balance Inputs Artificial fertilizer N/ha 83 Net feed import N/ha 56 Fixation N/ha 5 Deposition N/ha 16 Total inputs N/ha 160 Outputs Milk N/ha -10 Meat, cattle N/ha -2 Meat, pigs N/ha -28 Vegetable products N/ha -13 Total outputs N/ha -53 Balance N/ha 107 N-efficiency % 33% Ammonia losses % of N-surpluss 22% Ammonia losses N/ha 24 Denitrication % of N-surpluss 14% Denitrication N/ha 14 Nitrate leaching & soil-N changes N/ha 69 Soil-N change (- breaking down, + built up) N/ha 3 Nitrate leaching N/ha 65 Soil-N changes are calculated with C-tool, see www.agrsci.dk/c-tool/

  5. 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 400 Cereals 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%


  6. Table 5. Farm characteristics on Fyen in 2002 and 100 % organic scenario. 100 % org. scenario Fyen, 2002 Number of farms No 6.328 Area, incl. set aside & perm. grass ha 223.376 223.376 Area, incl. set aside & perm. grass ha/farm 35,3 35,3 Set aside ha/farm 2,4 0 Permanent grass ha/farm 1,3 1,3 Area 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

  7. Table 6. Assumptions for 100 % organic with no-import on Fyen. Feed and area use for cattle 1) SFU/MPU Grass/clover & whole crop silage 6975 1) SFU/MPU Cereals 1302 1) MPU No of cattle in herds 66,269 2) LSU No of cattle in herds 102,067 132% Cereals for cattle SFU 86,281,783 Grass/clover, whole crop & perm. ha 116,805 Area use for cattle production ha 142,182 Livestock density on cattle farms on Fyn LSU/ha 0.72 1) 1 MPU=1 frisian dairy cow + 1.03 frisian heifer + 1 steer 2) 1 LSU = 0.85 frisian dairy cow/ 0.34 heifer or steer Fyen in total LSU in % of conv

  8. Table 7. Assumptions for 100 % organic with 0-import on Fyen. Feed and area use for pigs 1) SFU/PU Grass/clover & whole crop silage 600 1) SFU/PU Cereals 3971 1) SFU/PU Peas 1346 1) SFU/PU Rapecaces 382 1) 1 PU = 1 year sow + 18,7 slaugther pigs Cereals for pigs etc. ha 33.565 Cereals for pigs etc. SFU 114.119.854 No of pigs PU 28.738 2) LSU No of pigs 33.911 30% Grass/clover & whole crop silage ha 3.316 Peas ha 11.377 Rape seed cakes ha 7.075 Area use for pigs ha 55.333 Livestcok density of pig area on cattle farms LSU/ha 0,61 2) 1 LSU = 100 kg N from manure storage LSU in % of conv

  9. Table 8. Assumptions for 100 % organic with 0-import on Fyen. Manure production % of conv dairy N-efficiency, cattle herd % 15,7% 76% N-production, cattle N/ha 104 N-production, cattle on grass N/ha 36 N-production, cattle in stabble N/ha 68 % of conv pig N-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%

  10. Table 9. Farm gate N-balances of Fyen in 2002 and 100 % org. sce. on Fyen. 100 % Org. in Units Conv. 2002 Organic % 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 balance Inputs Artificial fertilizer N/ha 83 0 Net feed import N/ha 56 0 Fixation N/ha 5 66 Deposition N/ha 16 16 Total inputs N/ha 160 82 51% Outputs Milk N/ha -10 -8 Meat, cattle N/ha -2 -4 Meat, pigs N/ha -28 -5 Vegetable products N/ha -13 -7 Total outputs N/ha -53 -25 47% Balance N/ha 107 57 54% N-efficiency % 33% 30% 91%

  11. Table 10. Farm gate N-losses of Fyen in 2002 and 100 % org. sce. 100 % Org. in Units Conv. 2002 Organic % 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/