1. Making do with less Senior adviser, Plant nutrition Leif Knudsen, DAAS Dansk Landbrugsrådgivning Landscentret | Planteproduktion

2. Making do with less: Nitrogen statistic for Denmark Trials with increasing amounts of Nitrogen Different types of nitrogen fertilzer in cereals, maize and potatoes Starter fertilizers to maize Manganese and other micronutrients Reducing leaching of nitrogen

3. Imported Exported Surplus Kyllingsbæk, 2005 Nitrogen account for Denmark

4. Mineral fertilizer Animal manure Input of nitrogen in Danish Agriculture Input reduced 35 pct from 84/85 to 04/05

5. Nitrogen in animal manure from cattle 198519962004 Milk yield, ECM per cow630076008745 Excr. kg per cow123128134 Excr. gr. per kg ECM19,516,815,4 Dairy cows, 1,000 890701569 Kg N from cattle, 1,000 t170142115

6. Nitrogen excretion from pigs Excretion of nitrogen per kg produced kg meat

7. Yield in winter wheat 1980-2006 30 40 50 60 70 80 90 100 1980198519901995200020052010 Hkg per ha Belgium Denmark France Germany Netherland Sweden UK

8. Results of trials with increasing amounts of nitrogen 2006Ave. 2001-2005 16984,51619684,765 Winter wheat 11057,91713058,754 S.Bar- ley Opti- mal N, kg/ha Yield, deci- ton/ha No. of tri. Opti- mal N, kg/ha Yield, deci- ton/ha No. of tri.

9. ENTEC fertilizer to spring barley, 3 tr. 2006 0 20 40 60 80 100 120 050100150200250 Kg N in grain per ha Reference NS 24-7 ENTEC NS 26-13 Kg N per ha

10. Sulfammo NS 23-18 0 20 40 60 80 100 120 140 160 180 050100150200250300 Sulfammo NS 23-18 to winter wheat, 5 tr. 2006 Kg N uptake in grain per ha

11. 9,5 10,0 10,5 11,0 11,5 12,0 12,5 150175200175 Percent protein -------NS 24-7------- --NS 24-7 + N-plus-- 4 trials with N-Plus to winter wheat 2006 20 N i N-Plus st. 51 20 N i N-Plus st. 37 2 x 10 N i N-Plus

12. Nitro gen Phos- phor. Yield and response Units per ha

13. Winter barley without spraying with manganese sulphate Winter barley without spraying with manganese sulphate Winter barley with 2 x autumn spraying with 2,5 kg manganese sulphate Winter barley with 2 x autumn spraying with 2,5 kg manganese sulphate

14. 30 N in calcium- nitrate footplaced 30 N in amm.sul- phate footplaced 2 x MnSO 4 autumn sprayed Untreated 2 trials with foot placed fertilizer to prevent manga- nese deficiency in winter barley, 2006 Picture from trial no. 001 April 2006 0+51,6+30,70 -1,6+21,1+ 9,923,6 Yield and yield response tr. 001 og 002

15. 2005200620052006 6 trials,4 trials2 trials3 trials Untreated 67,468,262,256,5 Copper-0,2-0,4-0,32,0 Zinck0,1-0,2-1,7-2,4 Magnesum,sulphur-0,9 0,01,6 Nutrimix (Mix)-0,6-0,4-0,7-1,3 Epso Combitop (Mix)-1,40,10,50,2 Micro Mix.-0,7-1,3-1,7-0,5 Manganese-0,40,6-1,22,0 Selenium-1,5 - - Boron -0,4 --1,4 ns Yield and yield response, dt per ha Winter wheat Spring barley Trials with micronutrients 2005-2006

16. 0 10 20 30 40 50 60 70 80 Leaching of nitrogen, kg N/ha 60 kg N/ha 120 kg N/ha Spring barley, with and without catch crops Ploughed spring Without catch crop Ploughed spring with catch crop Effect of reduced N supply: 20 kg N reduced leaching = 30 pct. of N reduction Catch crops give more than a 50 per- cent reduction in leaching

17. Mustard as an intercrop between two winter wheat crops or sown together with winter wheat Mustard as an intercrop between two winter wheat crops or sown together with winter wheat

18. 0 5 1015 20 25 30 35 40 0-25 25-50 50-75 75-100 Kg N-min per 25 cm soil per ha Depth cm Winter wheat Sown at normal time N-min 98 kg N/ha Mustard as intercrop N-min 70 kg N/ha Very early sown winter wheat, N-min 63 kg N/ha Mustard + winter wheat N-min 30 kg N/ha Reduction of leaching in rotations dominated by winter cereals

19. Does the Danish regulation of nitrogen work and does it have an environmental impact? Clay soils, >10 pct. clay Upper ground water Root zone Mg nitrate-N per liter 90/91 2004/2005 Sandy soils (<10 pct. clay

20. Thank you for your attention