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 farmsNo6,328 Area, incl. set aside & perm. grassha223,376 Area, incl. set aside & perm. grassha/farm35,3 Set asideha/farm2,4 Permanent grassha/farm1,3 Area use of ploughed ha Grass/clover% of ha4% Maize & Whole crops% of ha5% Winter cereals% of ha41% Spring cereals% of ha31% Beets% of ha6% Rape% of ha4% Other% of ha9%

3. Table 2. Farm characteristics on Fyen in 2002. Net yield Grass/cloverSFU/ha6000 PermanentSFU/ha3000 Maize & whole cropsSFU/ha8000 Undersown grass/cloverSFU/haincl. G/C CerealsSFU/ha6233 Peaskg/ha3940 Winter rapekg/ha2820 TotalSFU/ha6302

4. Table 3. Farm gate N-balances of Fyen in 2002 UnitsConv. 2002 Farm characteristics LSU200.284 LSU/ha0,90 ECM milk/cow7672 Pigs/sow21,5 Farm gate balance Inputs Artificial fertilizerN/ha83 Net feed importN/ha56 FixationN/ha5 DepositionN/ha16 Total inputsN/ha160 Outputs MilkN/ha-10 Meat, cattleN/ha-2 Meat, pigsN/ha-28 Vegetable productsN/ha-13 Total outputsN/ha-53 BalanceN/ha107 N-efficiency%33% Ammonia losses% of N-surpluss22% Ammonia lossesN/ha24 Denitrication% of N-surpluss14% DenitricationN/ha14 Nitrate leaching & soil-N changesN/ha69 Soil-N change (- breaking down, + built up)N/ha3 Nitrate leachingN/ha65 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/cloverSFU/ha6000520087% PermanentSFU/ha3000150050% Conv. maize & org. whole crSFU/ha8000300038% Undersown grass/cloverSFU/haincl. G/C400 CerealsSFU/ha6233340055% Peaskg/ha3940312879% Winter rape seedkg/ha2820150053% TotalSFU/ha6302359957%

6. Table 5. Farm characteristics on Fyen in 2002 and 100 % organic scenario. Fyen, 2002 100 % org. scenario Number of farmsNo6.328 Area, incl. set aside & perm. grassha223.376 Area, incl. set aside & perm. grassha/farm35,3 Set asideha/farm2,40 Permanent grassha/farm1,3 Area use of ploughed ha Grass/clover% of ha4%40% Conv.maize & org.whole cr.% of ha5%12% Winter cereals% of ha41%40%(12% not fodder) Spring cereals% of ha31%incl. Beets% of ha6%0% Rape% of ha4%3,2% Other% of ha9%5,2%=peas

7. Table 6. Assumptions for 100 % organic with no-import on Fyen. Feed and area use for cattle Grass/clover & whole crop silage SFU/MPU 1) 6975 Cereals SFU/MPU 1) 1302 No of cattle in herds MPU 1) 66,269 No of cattle in herds LSU 2) 102,067132% Cereals for cattleSFU86,281,783 Grass/clover, whole crop & perm.ha116,805 Area use for cattle productionha142,182 Livestock density on cattle farms on FynLSU/ha0.72 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 Grass/clover & whole crop silage SFU/PU 1) 600 Cereals SFU/PU 1) 3971 Peas SFU/PU 1) 1346 Rapecaces SFU/PU 1) 382 1) 1 PU = 1 year sow + 18,7 slaugther pigs Cereals for pigs etc.ha33.565 Cereals for pigs etc.SFU114.119.854 No of pigsPU28.738 No of pigs LSU 2) 33.91130% Grass/clover & whole crop silageha3.316 Peasha11.377 Rape seed cakesha7.075 Area use for pigsha55.333 Livestcok density of pig area on cattle farmsLSU/ha0,61 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, cattleN/ha104 N-production, cattle on grassN/ha36 N-production, cattle in stabbleN/ha68 % of conv pig N-efficiency, pig herd%36% 1) 100% N-production, pigsN/ha61 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. Org. in UnitsConv. 2002% of conv Farm characteristics LSU200.284135.97868% LSU/ha0.900.6168% ECM milk/cow7672554072% Pigs/sow21.518.787% Farm gate balance Inputs Artificial fertilizerN/ha830 Net feed importN/ha560 FixationN/ha566 DepositionN/ha16 Total inputsN/ha1608251% Outputs MilkN/ha-10-8 Meat, cattleN/ha-2-4 Meat, pigsN/ha-28-5 Vegetable productsN/ha-13-7 Total outputsN/ha-53-2547% BalanceN/ha1075754% N-efficiency%33%30%91% 100 % Organic

11. Table 10. Farm gate N-losses of Fyen in 2002 and 100 % org. sce. Org. in UnitsConv. 2002% of conv Ammonia losses% of N-surpluss22% Ammonia lossesN/ha241354% Denitrication% of N-surpluss14% DenitricationN/ha14854% Nitrate leaching & soil-NN/ha693754% Soil-N changeN/ha33100% Nitrate leachingN/ha653451% Soil-N changes are calculated with C-tool, see www.agrsci.dk/c-tool/ 100 % Organic