S04-K9

Soybean

Variety Description

Variety used for comparison: 'S03-W4'

Summary: When 95% of the pods are ripe, the pubescence on the middle third of the main stem of 'S04-K9' is grey whereas it is tawny for 'S03-W4'. The plants of 'S04-K9' are shorter than the plants of 'S03-W4'. When 95% of the pods are ripe, 'S04-K9' has a light brown pod whereas 'S03-W4' has a dark brown pod.

Description:

PLANT: oilseed type, indeterminate growth type, semi-erect growth habit, grey pubescence on middle third of main stem, begins flowering and matures early to mid-season

HYPOCOTYL: medium intensity of anthocyanin colouration

LEAF: pointed ovate lateral leaflet

FLOWER: violet

POD: light brown
SEED: spherical, yellow ground colour of testa
HILUM: yellow

Origin & Breeding History: 'S04-K9' (experimental designation EE1600174) originated from the cross between 12DL000130 and 12D000165 conducted in the winter of 2013 in a contra season nursery in Graneros, Chile. Using a single seed descent method, the F2-F3 generations were grown in Arica, Chile in 2013 and 2014. Single F4 plants were selected for yield based on plant appearance in the winter of 2014 in Graneros, Chile and the resulting F5 generation was evaluated in a single replication trial in Arva, Ontario, Canada in 2015. The F6 and F7 generations were further evaluated in multiple trial locations in Canada and the United States in 2016 and 2017. A bulk increase of 'S04-K9' occurred at the F8 generation in Staffa, Ontario, Canada in 2018. Selection criteria included hilum colour, protein content and yield.

Tests & Trials: The comparative trials for 'S04-K9' were conducted at Syngenta Canada, Inc., Arva, Ontario in 2021 and 2022. The plots consisted of 2 replicates per variety containing 2 rows per replicate with a row length of 5 metres and a row spacing of 0.75 metres. The planting density resulted in a minimum of 300 plants per variety. The plant height was based on 20 measurements per variety per year. Mean differences were significant at the 5% probability level based on LSD values.

Comparison table for 'S04-K9' with reference variety 'S03-W4'

Plant height (cm)

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Soybean: 'S04-K9' (left) with reference variety 'S03-W4' (right)