KNOL-KOHL (KOHL RABI):  (Brassica oleracea (L.) 

var.gongylodes L.

I. Application and Amplification of General Seed Certification Standards

The General Seed Certification Standards are basic and together with the following specific standards

constitute the standards for certification of knol-kohl seed.

II. Land requirements

Land to be used for seed production of knol-kohl shall be free from volunteer plants.

III. Field Inspection

A minimum of three inspections shall be made, the first before the marketable stage of knobs, the 

second when knobs have formed and the third at the flowering stage. 

IV. Field Standards

A. General requirements

1. Isolation

    Cabbage seed fields shall be isolated from the contaminants shown in the column 1 of the Table below by the 

distances specified in columns 2 and 3 of the said Table:

        Contaminants                                                                                   Minimum distance (meters)

                                                                                                                Foundation        Certified

            1                                                                                                         2                     3

Fields of other varieties                                                                                 1600                1000

Fields of the same variety not conforming to the

varietal purity requirements for certification and 

from the following varieties of Brassica oleracea (L.)                                      1600                1000

Brassica oleracea (L.) var. oleracea : wild cabbage.

Brassica oleracea (L.) var. capitata L.:cabbage

B.oleracea (L.) var. ramosa DC: branching bush kale.

B.oleracea (L.) var. millecapitata (Lev.) Helm: thousand headed kale.

B.oleracea (L.) var. gemmifera DC : Brussels sprouts.

B.oleracea (L.) con var. acephala DC: fodder kale(karamsag)

B.oleracea (L.) var.viridis L. : collards, tree kale.

B.oleracea (L.) var. costata DC: Portugal cabbage, tronchuda kale.

B.oleracea (L.) var. subauda L. : savoy cabbage

B.oleracea (L.) var. italica Plenck.: broccoli ( Sprouting broccoli)

B.oleracea (L.) var. botrytis L. : cauliflower (heading broccoli).

B. Specific requirements

        Factor                                                                                              Maximum permitted (%)*

                                                                                                                Foundation            Certified

      Offtypes                                                                                               0.10                       0.20

  ** Plants affected by seed borne disease                                                  0.10                       0.50

  * Standards for offtypes shall be met at and after flowering and for seed borne diseases at final inspection.

** Seed borne disease shall be: 

     Black leg ( Leptosphaeria maculans (Desm). Ces & de Not.)

     Black rot (Xanthomonas campestris pv. campestris (pamm.) Dawson)

     Soft rot (Erwinia carotovora (L.R. Jones)

V. Seed standards

        Factor                                                                                              Standards for each class

                                                                                                                Foundation            Certified

Pure seed (minimum)                                                                                98.0%                   98.0%

Inert matter (maximum)                                                                             2.0%                     2.0%

Other crop seeds (maximum)                                                                    5/kg                      10/kg

Weed seeds (maximum)                                                                           5/kg                       10/kg

Germination  (minimum)                                                                            70%                      70%

Moisture (maximum)                                                                                 7.0%                     7.0%

For vapour-proof containers (maximum)                                                   5.0%                      5.0%