Quality of Western Canadian malting barley 2017 - Annual Harvest Survey
3. Annual Harvest Survey
Sampling and survey methodology
The 2017 malting barley survey was based on varietal composites, representing over two million tonnes of barley selected for domestic malt processing or for export as malting barley by several grain handling and malting companies: Cargill Inc, Canada Malting Co. Ltd., Rahr Malting Co., Richardson International, and Viterra Inc. The tonnage included in this survey represents only a portion of the total volume of malting barley selected in Western Canada and does not necessarily reflect the actual amounts selected. Samples were received from the beginning of harvest until the end of October 2017. All results presented in this report represent weighted averages based on tonnage of composite samples received and analyzed.
Quality of barley selected for malting in 2017: general trends and annual statistics
The quality of barley that was selected for malting in 2017 was excellent. The average levels of barley proteins (11.5%) in 2017 were slightly lower than the 10-year average (11.7%) (Figure 3.1). Barley exhibited excellent germination vigour and energy (Figure 3.2). This year's barley had very high average 1000 kernel weight (44.9 g), higher than the 10-year average (43.9 g) (Figure 3.3). Kernel plumpness, a measure of kernels remaining on the 6/64" slotted screen, averaged 93.6%, which was higher than the 10-year average (92.0%) (Figure 3.4). The average kernel diameter and kernel weight were also determined for individual varieties using the Single Kernel Characterization System. The results, presented in Figure 3.5, indicated differences among barley varieties with Bentley, AAC Synergy, CDC Bow, and AAC Connect having bigger and heavier kernels than other varieties tested this year.
Figure 3.1 Average protein content in barley selected for malting from 2007 to 2017
Average protein content in barley selected for malting from 2007 to 2017 Crop years 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 10 yr avg Protein, % 12.3 11.7 11.2 11.6 11.4 11.9 11.2 11.7 12.4 11.3 11.5 11.7
Figure 3.2 Average germination energy of barley selected for malting from 2007 to 2017
Average germination energy of barley selected for malting from 2007 to 2017 Crop years 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 10 yr avg Germination energy, 4 ml % 97 99 99 96 99 98 98 96 97 97 99 97.6
Figure 3.3 Average 1000 kernel weight of barley selected for malting from 2007 to 2017
Average 1000 kernel weight of barley selected for malting from 2007 to 2017 Crop years 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 10 yr avg 1000 kernel weight, g 39.0 44.6 44.3 41.7 44.2 41.5 47.7 44.2 45.7 46.5 44.9 43.9
Figure 3.4 Average plumpness of barley selected for malting from 2007 to 2017
Average plumpness of barley selected for malting from 2007 to 2017 Crop years 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 10 yr avg Plumpness, over 6/64" sieve (%) 84.0 93.8 94.1 92.1 93.2 88.4 93.1 93.3 94.5 93.1 93.6 92.0
Fig. 3.5 (a) Average kernel weight or two-row barley cultivars selected for malting in 2017
Kernel weight were determined using Single Kernel Characterization System.
Average kernel weight of barley varieties selected for malting Variety Kernel weight (mg) CDC Copeland 45.9 AC Metcalfe 45.5 AAC Synergy 48.4 Newdale 46.0 Bentley 49.2 CDC Kindersley 44.4 CDC Bow 53.6 AAC Connect 50.1
Fig. 3.5 (b) Average kernel diameter for two-row barley cultivars selected for malting in 2017
Kernel diameter values were determined using Single Kernel Characterization System.
Average kernel diameter of barley varieties selected for malting Variety Kernel diameter (mm) CDC Copeland 2.52 AC Metcalfe 2.54 AAC Synergy 2.58 Newdale 2.57 Bentley 2.57 CDC Kindersley 2.52 CDC Bow 2.66 AAC Connect 2.56
Pre-germination is the premature sprouting of grain while still in the ear as a consequence of prolonged spells of wet weather when mature grain remains uncut in the field or swathed and not yet combined; this event is called "pre-harvest sprouting". One of the enzymes produced very early during germination is α-amylase. Since the level of α-amylase in sound grain is very low compared to its level in the germinating grain, the content of α-amylase in grain can be used as a marker of germination. Rapid visco analysis (RVA) indirectly estimates the amount of α-amylase in barley by measuring the viscosity of ground barley in water. The results are expressed as viscosity in Rapid Visco Units (RVU) than can be converted to centipoise (cP) (1 Rapid Visco Unit = 12 cP).
RVA is used by barley selectors to identify sound, moderately and strongly pre-germinated barley, and to manage their supply accordingly. Samples with final viscosity values > 120 (RVU) are considered sound and the probability that they will retain germination energy (GE) after storage is very high. Samples with RVA values 50 to 120 (RVU) are moderately pre-germinated, whereas samples with RVA values < 50 (RVU) are substantially pre-germinated and the probability that they will lose GE during storage is high. They should be malted as soon as possible. To predict safe storage time more accurately, not only the RVA values, but also the storage conditions (temperature and relative humidity) and the initial moisture content of the grain have to be taken into account.
The majority of barley samples tested in 2017 survey was sound as indicated by high RVA values (>120 RVU) as shown in Figure 3.6. This year's high RVA values have been attributed to relatively early harvest and dry harvest conditions in Western Canada.
Malting conditions and methodologies
Initial malting trials indicated that, compared to 2016, this year’s barley needed slightly longer immersion periods during steeping to achieve adequate hydration levels. Accordingly, sufficient steep out moisture levels were achieved using two slightly longer wet steep cycles at 14°C. The germination and kilning steps were conducted according to the same schedules as last year. All analytical methods used in this survey to assess the barley, malt and wort quality are listed in Methods.
|Steeping||8 hours wet steep, 16 hours air rest, 7 hours wet steep, 15 hours air rest @ 14°C|
|Germination||96 hours @ 15°C|
|Kilning||12 hours @ 60 to 65°C, 6 hours @ 65°C, 2 hours @ 75°C, 5 hours @ 83 to 85°C|
Malting quality in 2017 - Highlights
- The dry growing season in 2017 resulted in ample harvest of excellent malt quality barley.
- Protein levels in barley grain were slightly lower, whereas thousand kernel weights and kernel plumpness levels were higher than the long-term averages.
- The majority of barley tested in this survey was sound and showed very high germination energy (99%) with little evidence of water sensitivity.
- High kernel weight and plumpness combined with low protein content resulted in high levels of malt extract.
- The levels of soluble proteins and free amino nitrogen (FAN) in worts were slightly lower than the long term average values for the most common malting barley cultivars. The levels of enzymes (diastatic power and α-amylase) in malts were adequate and close to the long term average values.
- Well-modified malts resulted in worts with low viscosity and low level of β-glucans.
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