DRAFT KENYA STANDARD            DKS 2077 : 2019  
                                                                                                               ICS 67.060  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Seed potato  — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
©KEBS  2019                              Second   Edition 2019 
 DKS 2077 : 201 9 
   ii TECHNICAL COMMITTEE REPRESENTATION  
 
 
 
 The following organizations were represented on the National Technical Committee : 
Kenya Plant Health Inspectorate Services (KEPHIS)  
Government Chemist’s Department  
University of Nairobi — Department of Plant Science and Crop Protection  
Kenya Organic Agriculture Network(KOAN)  
Kenya Agricultural   and livestock r esearch  Orga nization  (KALRO) -Horticultural Research institute  
National P otato   Council of Kenya (NPCK)  
AFA- Horticultural Cr ops Directorate  
Ministry of Agriculture , Livestock   and fisheries   
 
Kenya Bureau of Standards — Secretariat  
 
 
 
 
 
 
REVISION OF KENYA STANDARDS  
 
In order to keep abreast with the progress in the industry, Kenya standards shall be regularly reviewed. 
Suggestions for improvement of published standards are welcome and should be addressed to the Managing 
Director, Kenya Bureau of Stand ards.  
 
 
 
 
 
 
©Kenya Bureau of Standards, 2019 
 
Copyright. Users are reminded that by virtue of Section 25 of the Copyright Act, Cap. 12 of 2001  of the Laws of Kenya, copyr ight subsists in 
all Kenya Standards and except as provided under Section 26 of this Act, no Kenya Standard produced by Kenya Bureau of Standards may 
be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from the Managing 
Director . 
 
 
 
 
  
   iii  
 
 
 
 
  
 
 
 DKS 2077 : 201 9 
   iv  
 
DRAFT KENYA STANDARD              DKS 2077 :2019 
                       ICS 67.060 
 
 
 
 
 
 
 
 
Seed potato  — Specification  
 
 
 
 
 
 
 
KENYA BUREAU OF STANDARDS (KEBS)  
 
Head Office:  P.O. Box 54974, Nairobi -00200, Tel.: (+254 020) 605490, 602350, Fax: (+254 020) 604031  
E-Mail: info@kebs.org ,  Web:http://www.kebs.org  
 
Coast Region     Lake Region          Rift Valley Region  
P.O. Box 99376, Mombasa -80100   P.O. Box 2949, Kisumu -40100        P.O. Box 2138, Nakuru -20100  
Tel.: (+254 041) 229563, 230939/40                Tel.: (+254 057) 23549, 22396        Tel.: (+254 051) 210553, 210555  
Fax: (+254 041) 229448    Fax: (+254 057) 21814               
 
  
   v Foreword  
This Kenya Standard was prepared by the Propagation materials Technical Committee under the guidance of 
the Standards Projects Committee, and it is in accordance with the procedures of the Kenya Bureau of 
Standards  
This second edition cancels and replaces the first edition (KS 2077:2007), which has been technically revised. 
The standard has been revised to address sanitary and phytosanitary aspects  of seed potato that were missing 
in the previous edition. these include the tolerance levels for pests and diseases during storage and the quality 
requirements of a lot.  
During the preparation of this standard, reference was made to the following document s 
MS 371 — Specification for vegetable seed for planting.  
The Seeds and Plant Varieties Act, Cap. 326, of the Laws of Kenya.  
Acknowledgement is hereby made for the assistance derived from this (these) source (s)  
 
 
 
 
 
 
 DRAFT KENYA STANDARD        DKS 2077 : 201 9 
   1  
 
1 Scope   
This Kenya Standard specifies requirements and methods of sampling and test for seed potato and other 
propagation materials of the species Solanum tuberosum .  It specifies requirements for  field inspections varietal  
identity,  purit y;  genealogy,  traceability,  pests  and diseases, internal and external quality, physiology, sizing, 
packaging and labelling.  
2 Normative references  
The following referenced documents referred to in the text in such a way that some or all of their conten t 
constitutes requirements of this document. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies  
CAP 326:  National   seed certification legislations  
 
3 Terms and definitions  
For the purposes of this document, the following terms and definitions apply.  
3.1 
 black leg:  
Commonly used name of a bacterial disease of potatoes, caused by Erwinia carotovora subsp. atroseptica. 
Similar symptoms may, however, be caused by E. carotovora subsp. carotovora ,  E.chrysanthemi.and bacteria 
of the genus dickeya  and pectobacteria.  
3.2  
certification:  
An official control procedure which aims at ensuring the production and supply of seed potato which satisfy the 
requirem ents of this standard.  
  3.3 
consignment  
a quantity of seed potato consisting of one or more lots destined to a party and covered by one set of 
documents.  
3.4 
contaminated field:  
a field whose history and regulatory action indicates presence of a specific pathogenic organism in the soil.  
3.5 
 disease:  
any disturbance of a plant caused by pathogenic organisms which interferes with its normal structure, 
physiological function or economic value.                                                                                                   
3.6 
 field:  
a defined area of land used for cultivation of seed potato  
3.8 
generation  
the number of growing cycles since the first introduction in the field.  DKS 2077 : 201 9 
   2 3.9 
 homogeneous  
uniform in composition and appearance.  
3.10 
initial Stock  
the initial pathogen free   microplants, tubers or other propagation materials  produced and maintained under an 
official control programme.  
3.11  
inspection  
examination of plants, tubers, units of presentation, equipment or facilities by Nation al Designated  
Authority, to determine compliance with regulatory  requirements.  
3.12  
lot 
a quantity of seed potato bearing the same reference number, and being of the same variety, category, class, 
size and origin and covered by one sets of documents   
3.13 
National Designated Authority (NDA):  
organization, or agency empowered by national legislation to administer the certification of seed potato under 
this Standard.  
3.14  
origin  
officially defined area where a lot of seed potato was grown.  
3.15 
phytosanita ry measures  
provisions  in  accordance  with  the  National  or  Regional     Plant  Protection  legislation  and/or International 
Plant Protection Convention.  
3.16 
primary virus infection:  
attack occurring during the current growing season and not arising  from the seed tuber.  
3.17 
 quality:  
the sum of all characteristics that determine the acceptance of seed potatoes in relation to the specifications of 
this Standard.  
3.18 
quality Control:  
the control by the NDA of all activities encountered in the process  of producing and marketing seed potato in 
conformance with the Standard.  
3.19  
pest 
any  species,  strain or  biotype  of  plant,  animal  or  pathogenic agent  injurious  to  plants  or  plant products.  
3.20 
quarantine pest  
A pest of potential national e conomic importance to the country endangered thereby and not yet present there,or 
present but not widely distributed and being officially controlled.          DKS 2077 : 201 9 
 
   3 3.21 
regulated non -quarantine pest  
A non -quarantine pest whose presence in plants for planting affects the  intended use of these plants with an 
economically unacceptable impact and which is therefore regulated with the territory of the importing 
‘contracting’ party  
3.22  
sampling  
The procedure of drawing at random a number of tubers, plants or parts of plants,  which may be taken as 
representative of the lot or the field.  
3.23 
seed potato  
tubers of Solanum tuberosum L  which are certified by the NDA.  
 
3.24 
sprout inhibitor  
chemical substance, applied either to the plants during the growing season or to the tubers  after harvest which 
suppresses the normal development of sprouts.   
 
4  Provisions for variety  
 
Varieties shall be accepted into the Standard only if it has been officially released by the NDA.  
 
5 General requirements  
5.1 Seed potato shall be free from  p ests of  quarantine importance  and meet the thresholds stated in this 
standard in regard to the regulated non -quarantine pests, injurious diseases and pests and from any defects 
likely to impair their quality as seed.  
5.2 Seed potato shall be substantial ly dry outside and, in general, of normal shape for the variety.  
5.3 Seed potato or growing crops of potato shall not be treated with sprout inhibitors.  Neither growing crops of 
seed potato nor seed potato shall be treated with sprout inhibitors without p ermission from the NDA.  
. 
6 Classification  
Seed potato shall be classified according to variety, standards and generations.  Classification shall be subject 
to official control in the producing country. Seed potato shall be placed in three classes as defin ed in Table 1:  DKS 2077 : 201 9 
   4         
 
Table 1: Seed Potato Classes  
Code  Classes  Seed Parents  Colour of labels  
SS Breeders Seed  Progeny of parental stock  White   with   a   diagonal 
purple stripe  
B. Basic  Progeny  of  certified  breeders  seed  or  certified 
pre-basic seed  White  
C.1 Cer. 1st gen.  Progeny  of  certified  pre -basic  seed  or  certified 
basic seed  Blue 
C.2 Cert. 2nd Gen.  Progeny of  certified  basic  seed  or  certified  1st  
generation  Blue  red? 
C.3 Cert.     3rd        gen. 
(Standard)  Progeny of certi fied 2nd generation or certified 3rd  
generation  Blue grey?  
 
 
6.1   Breeders seed  
Progeny of parental stock. The breeders seed may include pre -basic seed.  
 
6.2 Basic Seed  
Seed potato descended directly  from  breeders  seed  or produced under special provi sions of a national 
certification scheme and are mainly intended for the production of certified seed potatoes.  
 
6.3 Certified Seed  
Seed potato descended directly from breeder Progeny of basic seed or certified seed of higher classes, Basic or 
Certified se ed and are mainly intended for the production of potato other than seed potato. Seed shall be 
classified as Certified I, Certified II or Certified III according to the minimum requirements given in sections 7.2, 
7.3 and 7.4 
 
7    Requirements for seed pota to 
7.1 General requirements  
7.1.1The parent material shall be true to type for the variety.  
7.1.2 Seed potato shall be produced from officially certified initial stock, which shall be practically free from the 
current most limiting pests and diseases inclu ding but not limited to the following;          DKS 2077 : 201 9 
 
   5 a)   Potato spindle tuber viroid  
b)   Clavibacter michiganensis spp. sepedonicus (ring rot)  
c)   Ralstonia solanacearum (Bacterial wilt)  
d)   Pectobacteria spp and dickeya spp   
e)   Potato viruses X, Y, S, M and A  
f)    Potato Leafroll Virus  
 g)   Late blight  
h)   Nematodes  
i)    Synchytrium endobioticum (Schilb or Wart disease)  
7.1.3  The  facilities  and  procedures  used  for  seed  potato  production  shall  be  subject  to  official approval 
by the NDA.  
 
7.2 Requi rements for the field  
Field for the production of seed potato shall meet the requirements specified under table 2  
 
Table 2: Field requirements  
 Seed Classes  
 Basic  C1 C2 C3 
Land requirements (seasons free of 
potato or related family)  5 3* 3* 3* 
Isolatio n (meters)  10 5 5 5 
Maximum off -types  BR=0  
 
PB=1  
 
B=2 2/100 plants  2/100 plants  3/100 plants  
Minimum number of inspections  4 4 4 4 
*for Bacterial Wilt, 7 year rotation is required.  
 
7.2.3 Tolerances for pests and disease for field  
Tolerance limits   for  pest and disease allowed for seed potato fields  shall be as specified under table  
4; DKS 2077 : 201 9 
   6  
 
Table 3 Tolerance limits for pests and disease  
 
 Seed Classes  
 Basic  C1 C2 C3 
Mycoplasma  1/1000 plants  1/1000 plants  1/1000 plants  1/1000 plants  
Potato Virus YSMV  1/1000 plants  10/1000 plants  13/1000 plants  13/1000 plants  
SMV potato virus Y  0 13/1000 plants  15/1000 plants  15/1000 plants  
Fusarium wilt  0 2/1000 plants  3/1000 plants  3/1000 plants  
Verticilium wilt  0 2/1000 plants  3/1000 plants  4/1000 plants  
 
7.3 Quali ty requirements for seed potato  
7.3.1 General  
The seed potato shall be free from Globodera rostochiensis (Woll), Globodera pallida (Stone), Synchytrium 
endobioticum (Schilb.) Prc,  Clavibacter michiganensis Spp. sepedonicus  (Spieck.  And  Kotth.)  Skapt.  and  
Burkh.,  Ralstonia  solanacearum (E.F.  Smith)  E.F. Smith, Potato spindle tuber viroid, Tomato Stolbur and 
mycoplasma  
 
7.3.1 Tolerance requirements for a lot  
During inspection, the allowed tolerance limits   for a lot  sha ll be as specified under t able 4  below;  
 
 
 
 
 
 
 
 
 
         DKS 2077 : 201 9 
 
   7  
 
Table 4 Tolerance levels - pests and diseases for seed potato  
Presence of earth and extraneous matter (%by 
weight),max  1% 2% 2% 2% 
Dry and wet rot  0% 1% 1% 1% 
External defec ts (e.g. malformed  or damaged 
tubers),max  3% 3% 3% 3% 
Common scab tubers affected over a specified 
percent of their surface  
 
Max by weight  0%surface 
cover  33.3% surface 
cover  33.3% surface 
cover  33.3% surface 
cover  
0 5 5 5 
Powdery   scab   5:   tubers    affected   over   a 
specified percent of their surface  
 
Max % by weight  0%surface 
cover  10% surface cover  10% surface 
cover  10% surface cover  
0 3 3 3 
Rhizoctonia tubers affected over a specified per 
cent of their surface  
 
% by weight max  0%surface 
cover 10% surface cover  10% surface 
cover  10% surface cover  
0 5 5 5 
Shrivelled    tubers     which     have     
become excessively dehydrated and wrinkled.  
 
% by weight,max  0 1 1 1   
Seed Classes  
  
Basic   
C1  
C2  
C3 
 
Scab  %  max  (No  more  than  
50%tuber covered) per 50Kg bag   
25  
50  
50  
50 
 
Pink         rot         (Phytophthora erythrosepti ca) %   
0  
1  
1  
1 
 
Soft rot (Pectobacteria and Dickeya)p) %   
0  
1  
1  
1 
 
Severe Tuber Moth %   
2  
5  
5  
5 
Ralstonia      
pectobacteria      DKS 2077 : 201 9 
   8  
 
8    Requirements for sizing  
8.1 General requirements  
Breeder seed are exempted from the minimum sizing requirements. Sizing shal l be as specified under  Table 5 . 
Table 5 : Size requirements  
 
 
Seed Classes  
 
Size  
Basic   
C1  
C2  
C3 
 
28-35 mm   
5 tubers/25kg bag   
5 tubers/25kg bag   
5 tubers/25kg bag   
5 tubers/25kg bag  
 
36 –45mm  
5 tubers/25kg bag   
5 tubers/25kg bag   
5 tubers/25kg bag   
5 tubers/25kg bag  
46-55 5 tubers/25kg bag  5 tubers/25kg bag  5 tubers/25kg bag  5 tubers/25kg bag  
 
9    Packaging  
9.1 Presentations  
9.1.1 Condition of units of presentation  
The package shall not b e more than 50kg, shall be clean and allow for aeration and which conforms to the 
regulations in the destination country. The reuse of packages shall not be allowed.  
9.1.2 Sealing of units of presentation  
The corresponding NDA shall supervise the sealing o f containers. In case of need, re -sealing of the package or 
container shall be done under the official control by the NDA.  
 
10 Labelling  
10.1 Official label  
Units of presentation shall bear an official label in accordance with 10.2 and which has not been p reviously used; 
the label shall be white with a diagonal purple line for breeder seed white for basic seed and blue for certified 
seed.  
10.2 Required information the official label          DKS 2077 : 201 9 
 
   9 10.2.1. Name of the product shall be "Seed potato"  
10.2.2. The National Des ignated Authority (NDA) or its recognized initials  
10.2.3. Origin of the product   
10.2.4. Official lot number  
10.2.5. Month and year of harvesting  
10.2.6. Date of packaging  
10.2.7. Variety  
10.2.8. Class  
10.2.9. Tuber size  
10.2.10. Declared average net weig ht at packaging  
10.2.11. Warning “Not for human consumption”  
 
10.3 Additional information  
Without contradicting the information on the official label, the  producer  may  provide  additional information and 
such information may not be misleading.  
 
10.4 Che mical treatment  
The nature of the active substance of any chemical treatment of the seed potato shall be indicated either on the 
outside of the unit of presentation, on the official label or a label provided by the supplier, or printed on the unit of 
prese ntation. This information may also appear inside the unit of presentation.  
10.5 Re -inspection and re -labelling  
If re-inspection is conducted, the authority which carried out the re -inspection shall be stated on the new label, 
as well as the date of the re -sealing.  Re -labelling shall be done under the supervision of the NDA. The new 
label shall show the particulars which appeared on the old label. If a new label is necessary, this shall show the 
particulars, which appeared on the old label, the date of the re-closing and the authority concerned.  
11 Sampling  
Sampling of seed potato for certification purposes shall be carried in accordance with Annex A.  
12 Comparative tests  
It is recommended that trials be established by the NDA to ascertain the condition of t he certified seed potato. 
The NDA shall provide the test guidelines to be followed. The results of such trials shall be treated  in  DKS 2077 : 201 9 
   10 confidence  but  on  request  the  results  relating  to  individual  consignments  may  be exchanged between the 
NDA of th e importing and exporting countries concerned.  
13 Compliance  
A seed potato lot shall be deemed to comply if upon inspection and testing, the provisions under this standard 
are met.  
         DKS 2077 : 201 9 
 
   11 Annex A (Normative)  
A.    Organizing the inspection of crops grown from sa mple lots of seed potato  
(certified according to this standard)  
A.1. Purpose of the inspection  
The examination of  seed  potato  in  crop  tests  enables  the  quality  (vigour,  purity,  healthiness, productivity) 
of home grown and imported lots put on th e market to be checked at random.  
A.2. Organization  
A.2.1. Place of sampling  
Depending on the mode of transport (road, rail or waterway), the sample shall preferably be taken when the lot 
arrives at its destination.  
A.2.2. Organs responsible for the sampli ng 
 The sampling shall be done by the NDA.  
 
A.2.3. Sampling  
(a) Th e lot as defined in section 3.12  of this standard  is the unit represented by a sample. If the lot is a large one, 
the number of samples shall be increased to:  
i) One sample per wagon or vehi cle, in the case of transport by rail or road,  
 ii) One sample for every 50 tonnes, in the case of transport by ship.  
(b) A sample consists of 110 tubers, taken from different places in the container or from at least 10 sacks.  
(c) The sample shall be place d in a sealed sack; its label shall bear the number of the wagon or the name of the 
ship.  
 
A.2.4. Preservation of samples  
Samples shall be preserved in a uniform manner in favourable conditions.  
A.2.5. Trial fields  
(a) The land shall be suitable for potato  growing.  DKS 2077 : 201 9 
   12 (b) Planting shall be done in plots of 100 plants. The plots shall be grouped by variety in order to facilitate 
comparison.  
(c) Manuring shall be adapted to the needs of the crop, but moderate; the use of nitrogen during growth shall be 
prohibite d. 
(d) The usual cultural care shall be conducive to keeping the field clean and the foliage intact  
A.2.6. List of plots  
A nomenclature of all the samples planted in the same field with the number of the plot concerned shall be sent 
to the organs responsib le for evaluating them.  
A.2.7. Evaluation of the crop inspection  
In order to be accurate, the evaluation shall in principle be carried out in two stages, with an interval of  
10-15 days between them. Primary virus infections shall not be taken into consider ation.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
         DKS 2077 : 201 9 
 
   13 Annex B  (Informative)  
 
 
 
 
 
 
 
 
 
 
 DKS 2077 : 201 9 
   14  
 
 
 
 
 
 
 
 
 
 
 
 
 
         DKS 2077 : 201 9 
 
   15 Annex C  
                                                              (Informative)  
C.1 Sampling tubers for virus testing  
In testi ng seed stocks for the incidence of virus, it is seldom feasible to test the entire stock, so a test is done on 
a sample from the stock. Ideally, only seed stocks with infection levels below the tolerance would be accepted 
and those above the tolerance rej ected. However, taking a sample from a stock means that only estimation of 
the actual incidence of virus can be made. The reliability of this estimation will vary with the size of the sample, 
relative to the size of the lot, and the Population standard, wh ich is set for the test. Defining an acceptable 
population standard for any sample entails two types of risk.  
 
The first is that of rejecting a stock containing less virus than the tolerance and is often described as the A 
grower = s at risk. The risk of a ccepting a stock containing more virus than the tolerance is known as the A buyer  
= s at risk.  
 
From the point of view of classification authorities, this could also be described as the risk of passing a stock 
which fails to meet the official tolerances. S uch testing makes a number of important assumptions, which are, 
primarily, that the infected tubers are distributed homogeneously in the stock and that tubers are sampled 
randomly. In addition, the choice of the size of sample to be tested will need to be balanced by other practical 
factors such as cost, available facilities, labour, logistics of handling samples, seed stock size,  etc.  The  
following tables and graphs illustrate some of the principles involved in sampling tubers for testing for virus.  
 
C.2 Confidence limits  
 
Testing different samples from the same seed stock will give a range of results, which, statistically, will lie within 
a specific interval with a certain percentage confidence. This interval is known as the confidence interval. The 
acceptable level of confidence or probability should be decided before the testing is conducted but 95% 
confidence/probability is normally used. The accuracy of the estimation can be improved by increasing the 
sample size and by adjusting the allowable number  of infected tubers in the sample, i.e. the sample tolerance. 
(Table C.1).  
 
For example, the size of the confidence interval for a sample tolerance of 4% (4 allowable tubers) is  
 
8.8% based on a sample of 100 tubers but, on a sample of 200 tubers, the inte rval decreases to 6% i.e. 7.7 -1.7. 
The effect on the confidence interval of increasing the sample size does, however, become smaller at the larger 
sample sizes. Increasing the sample size from 100 to 200 tubers improves the accuracy of the estimation by 32  DKS 2077 : 201 9 
   16 %, i.e. confidence interval reduced from 8.8 to 6.0%, whereas increasing the sample size from 300 to 400 tubers 
only gives an improvement of 15%.  
In practice, therefore, the benefits of increasing the sample size have to be weighed up against the addition al 
cost of the testing. The accuracy of the estimation can also be affected by changing the allowable number of 
infected tubers in the sample (table 4). For example, by decreasing the number of allowable tubers from 4 to 3, 
i.e. changing sample tolerance f rom 4 to 3 %, the confidence interval is decreased from 8.8 to 7.9 % and the 
confidence limits themselves become lower. Decreasing the allowable number of infected tubers in the sample 
also has a significant effect on the probability of classifying at high er tolerances than those allowed in the sample 
as illustrated in the next paragraph.  
Table C.1: Confidence limits, at a probability of 95%, for various sample tolerances of virus in relation to 
the size of the sample.  
 
Tolerance (%) for  
 
virus in a seed st ock  
Size of sample   
Allowable  No  of 
infected tubers   
Confidence limits  
    
Lower   
Upper  
 
4  
100  
4 (3)  
1.1(0.6)   
9.9(8.5)  
  
200  
8(7)  
1.7(1.4)   
7.7(7.1)  
  
300  
12(11)   
2.1(1.8)   
6.9(6.5)  
  
400  
16(15)   
2.3(2.1)   
6.4(6.1)  
 
10  
100  
10(8)   
4.9(3.5 )  
17.6(15.2)  
  
200  
20(18)   
6.2(5.4)   
15.0(14.0)  
  
300  
30  
6.9  
13.8 
  
400  
40  
7.2  
13.8 
 
 
Probability of classifying stocks to meet specified tolerances  
 
From the confidence intervals, it can be seen that classifying stocks based on a sample will c ontain a risk that 
some stocks, which fail a test, do, in fact, meet the tolerance and others, which pass, should fail.  
         DKS 2077 : 201 9 
 
   17 Table C.2 and Figure 1 show the effect of varying sample size and the number of virus infected tubers allowed in 
the sample on the prob ability of classifying seed stocks with different incidences of virus infection. For example, 
in a test on a sample of 100 tubers where 3 virus infected tubers were allowed, there would be a 14% chance of 
classifying a stock containing 6% virus as meeting a tolerance  of  4%.  Probability  of  classifying  seed  stocks  
at  two  tolerances  for  virus  based  on  a laboratory test in relation to the size of sample and the allowable 
number of virus -infected tubers in  
the sample:  
Table C.2  
 
 
1. Note: The allowable number of tubers is, often, set at a lower level than the overall seed stock tolerance of 4 and 
10% respectively, particularly in the case of a relatively small sample size. By lowering the tolerance in a Sample the > 
buyers ri sk = is reduced.  
2. Figure 1: Probability of classifying seed stocks with different incidences of virus as meeting a tolerance of 4% or 
10% for virus in a laboratory test in relation to the size of sample and the allowable number of virus infected tubers in t he 
sample;  
3. tolerance up to 4%  
4. tolerance up to 10%  
 DKS 2077 : 201 9 
   18 
 
 
 
 
         DKS 2077 : 201 9 
 
   19 Bibliography  
 
 
EAC Plant protection legislation  
CAP 326 - Seed and plants varieties act