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Nyt om majs

Nyt om majs. Majsvarmeenheder og sortsvalg Ny normal for MVE på vej Stay-green og visnetyper NDF i majssorter. Silomajs. Mål: 30-32 pct. tørstof Forøgelse i september: 100 majsvarmeenheder (Ontario) pr. uge 1,5 procentenheder tørstof pr. uge eller 0,2 pr. dag.

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Nyt om majs

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  1. Nyt om majs • Majsvarmeenheder og sortsvalg • Ny normal for MVE på vej • Stay-green og visnetyper • NDF i majssorter

  2. Silomajs • Mål: 30-32 pct. tørstof • Forøgelse i september: • 100 majsvarmeenheder (Ontario) pr. uge • 1,5 procentenheder tørstof pr. uge eller 0,2 pr. dag

  3. Valg af majssort i Danmark Minimum i forhold til LG 20.80 eller Antares Varmeenheder (Ontario) 2200-2300 2300-2400 2400-2500 2500-2600 >2600 Tørstof, % Tidlighed, dage +3,0 +1,5 0 -1,5 -3,0 +14 +7 0 -7 -14

  4. Majsvarmeenhederved Tylstrup 3.100 2.900 2.700 2.500 2.300 2.100 1.900 1.700 1.500 1960 1970 1980 1990 2000 Kilde: DJF

  5. Stay-green • Kolben modner hurtigere end stænglen • Grønne planter ved høst • Lav tørstofprocent • Højt indhold af stivelse

  6. Visnetyper • Kolber og stængel modner samtidig • Gule/visne planter ved høst • Højere tørstofprocent • Lavere indhold af stivelse

  7. Stay-green contra visnetyper

  8. Stay-green index Pct. stivelse i tørstof Stay-green index = Pct. tørstof Stay-green: højt index Visnetyper: lavt index

  9. Majssorter 2000-2001

  10. Majssorter 2001 47,0 45,0 43,0 41,0 Pct. NDF i tørstof 39,0 37,0 2 R = 0,0424 35,0 20,0 25,0 30,0 35,0 40,0 Pct. tørstof

  11. Majssorter 2001 FK NDF 63,0 61,0 59,0 57,0 2 R = 0,16 55,0 20,0 25,0 30,0 35,0 40,0 Pct. tørstof

  12. Majssorter 2000-2001 65 63 61 FK NDF (2001) 59 57 2 R = 0,03 55 0,85 0,90 0,95 1,00 1,05 1,10 Stay-green index (2000-2001)

  13. Majssorter 2001 1,36 1,34 1,32 1,3 2 R = 0,30 1,28 Kg tørstof pr. FE 1,26 1,24 1,22 1,2 1,18 56,0 57,0 58,0 59,0 60,0 61,0 62,0 FK NDF

  14. 1,36 1,34 Majssorter 2001 1,32 1,3 Kg tørstof pr. FE 1,28 1,26 2 R = 0,65 1,24 1,22 1,2 21,0 22,0 23,0 24,0 25,0 26,0 27,0 Pct. ford. NDF i tørstof

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