This document summarizes a study that compared the use of chemical fertilizer and separated liquid pig manure as sole nitrogen sources for winter wheat production. The study tested these two nitrogen sources applied at three different growth stages and measured their effects on leaf chlorophyll levels, nitrogen uptake, grain yield, and nitrogen use efficiency. The results showed that liquid pig manure increased grain yield and crop nitrogen uptake compared to a zero nitrogen control, and timely application resulted in similar yields as chemical fertilizers. However, chemical fertilizer was a more efficient nitrogen source for maximizing grain production. In conclusion, liquid pig manure can be a useful nitrogen source for winter wheat, but chemical fertilizer remains more efficient for grain yield.

1. A comparison of chemical fertiliser and separated liquid pig manure as the sole nitrogen source for winter wheat production.Gráinne Meade & Tom Mc CabeUniversity College Dublin,Lyons Research Farm, Newcastle, Co. Dublin, Ireland.

2. Presentation Outline Background Hypothesis Materials and Methods Results Conclusion

3. Background

4. Background Improved manure spreading technologies and Improved manure treatment technologies Land application of pig manure at advanced winter wheat growth stages may now be viable

5. Hypothesis Can liquid pig manure be used as an alternative to chemical fertiliser as a nitrogen source for winter wheat production?

6. Materials and Methods 2 experimental sites 3 N treatments Untreated zero N control Separated liquid pig manure (LPM) Inorganic N fertiliser (CF) 3 manure application timings G.S 31 (1st node) G.S 33 (3rd node) G.S 39 (flag leaf emergence)

7. Materials and Methods N rate 120 kgN/ha Liquid Pig Manure (LPM) 4% N, 0.08% P, 2% DM Band spread at a rate of 30 m3/ha Inorganic N (CF) – 27% N Leaf N % and chlorophyll readings taken at 10 day intervals until natural senescence Crop N uptake, grain yield and nitrogen uptake efficiency was assessed at harvest

8. Results

9. Effect of trial site and N source on leaf chlorophyll readings

10. Effect of trial site and N source on leaf N percent

11. Effect of manure application timing on leaf chlorophyll readings

12. Effect of N application timing on leaf chlorophyll readings

13. Polynomial regression of average leaf chlorophyll readings and leaf N content samples taken at 10 day intervals for 70 days post N application

14. Polynomial regression of average leaf chlorophyll readings and leaf N content samples taken at 10 day intervals for 70 days post N application

15. Correlation between leaf N percentage and leaf chlorophyll readings Chlorophyll Units

16. Effect of N source on winter wheat crop N uptake

17. Effect of N source on winter wheat grain yield (kg/ha)

18. Effect of N application timing on grain yield

19. Nitrogen uptake efficiency as affected by N source and site

20. Conclusion LPM proved to be a useful N source for winter wheat production LPM increased grain yield and CNU by 48% and 74% respectively compared to the zero N control. Timely LPM application can achieve similar grain yield levels to chemical fertilisers LPM application may result in economic benefits for cereal producers CF proved to be a more efficient N source for grain yield production

21. Thank you for listening! Any Questions????