Temperaturens betydelse för groning och uppkomst av ... - SLU
Temperaturens betydelse för groning och uppkomst av ... - SLU
Temperaturens betydelse för groning och uppkomst av ... - SLU
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Innehålls<strong>för</strong>teckning<br />
FÖRORD ...............................................................................................................................3<br />
SAMMANFATTNING ..........................................................................................................4<br />
INLEDNING ..........................................................................................................................6<br />
SYFTE ...................................................................................................................................6<br />
ALLMÄNT OM RAPS ..........................................................................................................7<br />
Grundkr<strong>av</strong> <strong>för</strong> odling <strong>av</strong> höstraps <strong>och</strong> vårraps .....................................................................7<br />
Höstrapsens kr<strong>av</strong> på plantstorlek vid invintring ...................................................................7<br />
Daggrader <strong>för</strong> tillväxt <strong>av</strong> höstraps på hösten........................................................................8<br />
Plantantal <strong>för</strong> höstraps in<strong>för</strong> invintring ................................................................................8<br />
Vårraps ...............................................................................................................................9<br />
Plantantal vårraps ...............................................................................................................9<br />
Antal dagar från sådd till skörd <strong>för</strong> vårraps .........................................................................9<br />
Bastemperatur <strong>för</strong> <strong>groning</strong> <strong>av</strong> fram<strong>för</strong>allt våroljeväxter <strong>och</strong> antal daggrader som behövs <strong>för</strong><br />
<strong>uppkomst</strong> <strong>av</strong> höstraps <strong>och</strong> vårraps ..................................................................................... 10<br />
Fröstorlekens <strong>betydelse</strong>, tusenkornvikten .......................................................................... 12<br />
<strong>Temperaturens</strong> påverkan på <strong>groning</strong>en .............................................................................. 13<br />
VATTENHALT I SÅBÄDD ................................................................................................ 14<br />
Våren ................................................................................................................................ 14<br />
KLIMATFÖRUTSÄTTNINGAR ......................................................................................... 14<br />
Allmänt om klimatet i Sverige .......................................................................................... 14<br />
Temperatur ....................................................................................................................... 14<br />
Vegetationsperiod ............................................................................................................. 14<br />
MATERIAL OCH METOD ................................................................................................. 15<br />
Kärl<strong>för</strong>sök ........................................................................................................................ 15<br />
Prov odling ................................................................................................................... 15<br />
Sådd kärl<strong>för</strong>sök ............................................................................................................. 16<br />
Planträkning kärl<strong>för</strong>sök ................................................................................................. 17<br />
FÖRSÖKSPLATSER OCH FÖRSÖKSPLAN FÖR FÄLTFÖRSÖK ................................... 17<br />
0S7-190 ........................................................................................................................ 17<br />
Ultuna............................................................................................................................... 18<br />
R2-4135 ........................................................................................................................ 18<br />
R2-5079 Försök med bearbetningsdjup <strong>och</strong> <strong>för</strong>plog i vårraps ........................................ 19<br />
UNDERSÖKNINGAR ......................................................................................................... 20<br />
Såbäddsundersökningar .................................................................................................... 20<br />
Vattenhalt ......................................................................................................................... 20<br />
Planträkning ..................................................................................................................... 20<br />
Sådjupsmätning ................................................................................................................ 20<br />
Plantgradering in<strong>för</strong> invintring .......................................................................................... 20<br />
Temperaturmätningar ....................................................................................................... 21<br />
RESULTAT ......................................................................................................................... 21<br />
Kärl<strong>för</strong>sök <strong>och</strong> Top of paper ............................................................................................. 21<br />
Groning <strong>och</strong> <strong>uppkomst</strong> i kärl<strong>för</strong>söket samt bastemperatur ................................................. 23<br />
Daggrader ......................................................................................................................... 25<br />
OS7-190 Östergötland ...................................................................................................... 29<br />
R2-4135 Ultuna ................................................................................................................ 33<br />
R2-5079 Ultuna ................................................................................................................ 37<br />
DISKUSSION ...................................................................................................................... 42<br />
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