Forage quality and yield increments of intensive managed grassland in response to combined sulphur-nitrogen fertilization Dedicated to Prof. em.Dr. Alois Kornher on his 75th birthday. |
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Authors: | M Gierus Ute Jahns R Wulfes C Wiermann F Taube |
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Institution: | 1. Grassland and Forage Science/Organic Agriculture , Institute of Crop Science and Plant Breeding, Christian Albrechts University of Kiel , Kiel, Germany mgierus@email.uni-kiel.de;3. Grassland and Forage Science/Organic Agriculture , Institute of Crop Science and Plant Breeding, Christian Albrechts University of Kiel , Kiel, Germany;4. University of Applied Sciences , Osterr?nfeld, Germany;5. Agricultural Chamber of Schleswig-Holstein , Kiel, Germany |
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Abstract: | Abstract A three-year experiment was carried out at three different sites in northern Germany to investigate the effects of combined sulphur (S, up to 50 kg S ha?1 year?1) and nitrogen (N, up to 300 kg N ha?1 year?1) fertilization on dry matter (DM) yield and forage quality. There was an interaction effect of site, year, S and N fertilization. The greatest DM yield increment relative to yield at the start of the experiment (1997) with no S and N applied was 10.2 t DM ha?1 at Ostenfeld (arable grassland). Cattle slurry when applied to provide 50 kg N ha?1 and 10 kg S ha?1 did not noticeably increase yield. The S content in forage decreased significantly over the years without S fertilization. At 300 kg N ha?1 and 0 kg S ha?1, crude protein (CP) contents achieved 173 g kg?1 DM and were diluted due to higher DM yields with S fertilization. The true protein content (TP% of CP) differed significantly at 300 kg N ha?1. TP achieved 93% with 50 and 87% with 0 kg S ha?1 year?1, respectively. In conclusion, with N fertilizer intensities in the range of 300 kg N ha?1, it is necessary to apply 25 kg S ha?1 to improve forage yield and quality. On the other hand, with N fertilization levels below 300 kg N ha?1, S fertilization could be omitted. |
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Keywords: | N/S ratio grassland fertilization soil type sward age |
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