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this season was 0,03% compared to The weighted average percentage
the 0,06% of the previous season. crude fibre varied from 5,8% in KwaZulu-
The national weighted average Natal to 7% in the Northern Cape.
percentage of soya beans and parts of The South African weighted
soya beans above the 1,8mm slotted average, 6,3%, was the second
sieve, which passed through the 4,75mm highest of the annual surveys
round hole sieve, decreased from 1,54% since the 6,8% reported in the
the previous season to 1,13% this season. 2015/16 season. This season,
The weighted average percentage the average ash content was
defective soya beans on the 4,75mm 4,34%, the highest of the eight
sieve increased from 1,91% last season seasons since commencement
to 2,3% this season. Wet pods were of the crop surveys and 0,07%
not present in any of the samples. higher than the previous season.
Samples from the Northern Cape vary
Notable results and Limpopo, as well as the North West in order
The 2018/19 season is the first season to a lesser extent, tend to show higher to successfully
in which the SAGL conducted moisture, ash contents over seasons compared validate the authenticity of a specific
crude protein and crude fat analyses on to the other provinces. The nutritional vegetable oil. Building a database requires
the soya bean cultivar trial samples of component analyses results in this article gathering of information over different
the ARC Grain Crops. Table 1 contains are reported on an as is/as received basis. seasons, areas and cultivars in order to
a comparison of the results of the crop give a true reflection of the ranges wherein
survey and cultivar trial samples. Fatty acid profile analyses fatty acids can differ. There is currently
The weighted average crude protein An exciting and important addition to the no national updated database for the
content of the crop samples this quality survey this season is the inclusion of fatty acid composition of soya bean oil.
season was 37,6% compared to the fatty acid profile analyses. Fatty acid profiles It is important that South Africa, as a
37,4% of the previous season. As in the are the most important tool for identifying soya bean producing country, develops
previous two seasons, Limpopo had the authenticity of vegetable fats and oils. and maintains a national fatty acid profile
the highest weighted average crude All types of oil have their own specific fatty database to the benefit of the oilseeds
protein content (38,74%); the Free State acid profile that is unique to that product. industry. Annual analysis of crop and
(36,9%) reported the lowest average. The The unique fatty acid profile of each cultivar samples will ensure that the
weighted average crude fat percentage product/crop is a combination of saturated, natural variation caused by different
of 17,8% was slightly lower than the monounsaturated and polyunsaturated cultivars, as well as the influence of
18% in the previous season and also oils and is specific to that type of oil. climate and locality, are included in the
the lowest of the last six seasons. The fatty acid profiles of every crop, database values. Seasonal variations
The samples from KwaZulu-Natal had however, are subject to variation. The will also be addressed. Recording all
the highest weighted average crude variation or typical pattern of fatty acids variations applicable to the crops in
fat content, namely 19,2%. The lowest in a specific oil not only influences the the database will enable the annual
average fat contents were observed stability and physical properties of the oil, review of the specified ranges.
in the Free State and Northern Cape but also aids in distinguishing one type Precision Oil Laboratories was
with 17,3 and 17,4%, respectively. of oil from another. The variation of fatty subcontracted to perform fatty acid
acids within the profile analyses on 20 composite
Figure 1: Crude protein and crude fat results of the soya bean same product crop samples representing different
crop samples over the last eight seasons. depends on production regions, as well as 21
climate, latitude, cultivar samples from different localities
soil type, cultivar, supplied by the ARC Grain Crops. A
rainfall as well as total of 20 different fatty acids were
seasonal variation. included in the profile analysis.
These variations
should be included With gratitude to the Oil and Protein
when ranges Seeds Development Trust for financial
for identifying support of these annual surveys
authenticity are and to the members of Agbiz Grain
determined. for providing the crop samples.
It is imperative For more information, contact the
to include ranges Southern African Grain Laboratory NPC
in which fatty acids on 012 807 4019 or visit www.sagl.co.za.

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