Canola response to plant density at Chapman Valley, 2013 (13CH21)

Please note: This content may be out of date and is currently under review.

At Chapman Valley in 2013 canola grain yields began to plateau at approximately 20-30 plants per square metre (plants/m2).

Economic optimum target densities were found to be at 16 plants/m2 for Hyola 404RR, 24 plants/m2 for GT Viper, 33 plants/m2 for Hyola 450TT and 34 plants/m2 for ATR Stingray.

Taking into account contingencies such as seeding errors, dry conditions at seeding and changes in seed size or viability we suggest that seed rates of RR and TT hybrids and RR OP at similar sites be around 1.9 to 2.3 kg/ha, whilst the cheaper seed of less competitive TT OP lines be sown at 4.0 kg/ha.

Background

Breeding companies are favouring the development of hybrids in order to pay for breeding services.

Hybrids provide growers with more vigorous seedlings, comparatively better plant establishment and generally higher yields, however growers have to purchase new seed of hybrid varieties every year in order to get these potential yield benefits.

Seed for hybrid canola is 25 times more expensive than the seed of open-pollinated canola.

Inevitably if growers are forced into hybrids they will wish to minimise seed costs by sowing at lower densities.

Aim

To investigate the plant density response to yield and oil content of Triazine Tolerant (TT) and Roundup Ready (RR) hybrid canola in comparison with open-pollinated canola.

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Contact information

Mark Seymour
+61 (0)8 9083 1143
Page last updated: Tuesday, 24 March 2015 - 10:24am