Leaching from Maize in Denmark

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Leaching from Maize in Denmark
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High level of animal manure
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Nitrate conc. in cont. maizecoarse sand, 540 mm
drain, 2009
A3 Maize,220 N/ha
C1 Maize Ryegrass, 220 N/ha
A1 Maize, 100 N/ha
C1 Maize ryegrass, 100 N/ha
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Weak Perennial Ryegrass sown 20. June, photo late
autumn
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To strong Red Fescue, sown with maize, photo late
autumn.
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Leaching kg N/ha in maize after G/C
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When excess of nitrogen after grass/clover the
leaching is increaseed considerably when
applying extra nitrogen. Undersown grasses
reduces the leaching considerably
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28 reduction
56 reduc- tion
Undersown grasses reduces the leaching
considerably
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Typically maize silage remove more N then applied
totaly
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• - Maize grown after grass/clover is not
  influensed by undersown grasses.
• Up to 1/3 yield loss in silage maize grown after
  maize or
• grain (low mineralizatiion), when ½
  N-fertilization and
• undersown with a well developed red fescue

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Low yield reponse in maize grown after
grass/clover
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Conclusion

• Grasses undersown in maize reduces leaching.
• It is difficult to get the optimal balance
  between maize and grasses.
• Grasses wanted
• -with high N-uptake capacity
• -no depression on maize yield
• Maize after grass/clover is not affected by N or
  undersown grasses
• Maize after maize(grain) can be strong reduced be
  competion from undersown grasses

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Extras
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Herbiside affects Braccica, photo 23. June
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Chicory
Vinterrape
Foto ISK Formyre d 1/11-2009
Foto ISK Formyre d. 1/11-2009
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Poa annua makes problems ISK, Foulumgaard d. 19/6
2009
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ISK, Foulumgaard d. 28/7-09
Radrensning lykkedes fint, men kvik !
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