Dehulling and groat/hull content measurement at JKI-ZL Groß Lüsewitz

M. Herrmann

Equipment:

Feed hopper

Air pressure regulator Weighing scales with dehulled sample

Compressed air dehuller

Influencing factors for groat/hull content:

Environmental effects:

•sunny days, latitude

•Weather conditions

•Fertilizer

•Pretreatment of seeds and grain moisture content

Genetical factors: Kernel size and shape; „dehulling ability“

Dehulling methods (manually 200 kernels; compressed air dehuller, impact dehuller)

Influencing factors for hull content:

Dehulling parameters:

•Amount of seeds;

•Duration of dehulling

•Air pressure

Insufficient air pressure or duration results in ineffective dehulling, but excessive stress (higher air pressure and duration) results in groat breakage.

Quality of dehulling (300g-samples: 5min)

Bad dehulled sample

Quality of dehulling

Slightly better

Dehulling results are strongly influenced by location and genotype: (results from 2008)

Accession Romania Estonia404 55,2 32,7

PL51488 48,6 32,8NGB6198 67,7 35,9

4 60,5 36,28 62,5 39,0

mean 58,9 35,3

% hull content

Replications needed for evaluation of hull content (results 2008 with standards Groß Lüsewitz)

noninocul

1 2 3 4 5 6 7

ARGENTINA 25 29 27 26 27 28 25

AUTEUIL 23 26 25 26 27 27 24

BELINDA 23 23 22 25 34 24 28

EVORA 30 34 28 30 33 32 29

Genziana 22 20 21 25 23 25 23

IVORY 22 19 24 21 24 24 23

Jaak 27 26 24 27 27 25 25

Krezus 28 24 27 28 27 27 25

Mures 25 23 23 26 26 24

Inoculated

% hull content of replicated standards

Summary and conclusions

1. Capacity: Dehulling with compressed air dehuller in JKI-Groß Lüsewitz: 40 samples daily (300g-samples)

2. Wild oats need to be pretreated (de-awning) - dehulling leads to blockage of the dehuller

3. Very strong genotypic and location effects on dehulling

4. There is a wide range of hull content within the AVEQ-set of entries (10-80%hull)

5. Hull content from one replication is a very rough estimate (about ±6%)

6. Many samples need to be cleaned by hand because of remaining hulls or undehulled grains before analysis

Many thanks to the sponsors:

The European Commission’s ( Council Regulation

(EC) no. 870/2004),

Peter Koelln KGaA,

Emco spol. s r. o.,

Gemeinschaft zur Förderung der privaten

deutschen Pflanzenzüchtung e.V. (GFP)

Meeting additionally supported by the Association of the

Friends and Promotors of the Julius Kühn-Institute

(GFF) and Peter Koelln KGaA