Winter rapeseed Variety Trials

2007

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Wir lassen Qualität wachsen

Optimizing of Plot trials in Oilseed Rape

Finn Holmgaard Jensen,Gerhard Korporal,Norddeutsche Pflanzenzucht,H.-G. Lembke KG,Hohenlieth,Germany

2007

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Winter rapeseed Variety Trials

• Point of origin: Cereal Trial technique

• High use of labour in trials

• Difficult establishment and high trial errors

• high Interaction (Genotype x Environment)

• High Neighbour effect between genotypes

2007

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Neighbour effects in variety trials of Winter rapeseed caused by:

. Genotype

. Winter damage

. Speed of development

. Plant height

. Tendency of lodging

. Earliness/ripening time

2007

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Morphological characteristics of tested Winterrape GenotypesHohenlieth 1999

Büchse (2001)

Variety Plant heigth Standability Ripening (9 = no lodging) (9 = early) 1 144 9 6,62 139 9 5,33 165 8,8 6,24 165 5,3 6,25 170 6,5 5,96 170 6,4 6,3

5 and 6 = Hybrids

2007

Variety Single Double Tripple Bordered plot Centre plot plot plots plots (NPZ system) (of tripple)

1 91 95 93 98 942 83 92 91 96 963 94 90 96 98 984 107 101 98 95 975 115 112 115 108 1116 111 111 108 106 105

LSD(5%, t-Test) 11,9 7,1 6,7 7 9,4LSD(5%, t-Test) for Interaktion Variety x Plottype = 8,3

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Seed yield (rel.) from Winter rape varieties tested in different plot trial systems

Hohenlieth 1999

Büchse (2001)

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Mean Neighbouring Effect (One-sided neighbour)

Plant heigth Difference 10 cm = 0,510 Hkg/ha

Lodging Difference 1 Note = 0,507 Hkg/ha

Genotype Hybrid / Line = 0,662 Hkg/ha

from Büchse (2000), Datenbasis:BSV/EU-Versuche 1997, 1998, 1999

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NPZ Plot drilling Machine for Bordered Plots in Winterrape (Draft)

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NPZ-Drillmaschine für Kerndruschparzellen bei Winterraps

(Werkphoto)

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Technical specifications for NPZ Bordered Plots (Kerndrusch Parzelle)

• 1,75 m width of Plots („Centre“)

• 5 Drilling Rows

• 28 cm Row distance

• 63 cm distance between edge rows of Centre and first border rows of 2 on each side of Centre

• 3,50 m total width of Bordered plot system

• Strengthening and prolongation of frame of Drilling machine

• Higher placing of drilling cone.

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Harvest Technique for Bordered Plot system

• Separation of Centre and Border rows

• Swathing and harvest of Centre = Harvest plot

• Or direct Harvest of Centre

• Total width of Plot combiner ca. 2,10 m

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Advantages of NPZ Bordered Plot system (compared to double plots)

• Half the working hours by drilling and harvest• Very accurate yield-ranking of varieties caused by

exclusion of neighbour effects• Improving of LSD values as for double plots (can

give possibilities for reduction in number of replications)

• Improved differentiation in lodging (as for double plots)

• Possibilities for using the border rows for late scoring of stem diseases (Phoma, Verticillium)

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Disadvantages of Bordered plot system (Compared to single- and double plots)

• Increased need of land for trials (same as for double plots)

• Bigger tractor (ca. 50 HP) recommended for drilling• More working hours for separation of harvest plots

and border + manual preparations for swathing• Suitable Plot combiner for bordered plot system• Need of big combiner for harvest of borders

Thank you

for your attention

Winter rapeseed Variety Trials

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