PAC 660 –
Live Large

From North Queensland down to Southern New South Wales, PAC 660 is the hybrid of choice for growers chasing serious results. Whether you’re producing grain or silage, PAC 660 delivers class-leading yield, resilience, and flexibility across a wide range of environments.

What makes PAC 660 right for your farm?

PAC 660 offers excellent yield potential, a tall plant structure, and reliable disease resistance, making it a versatile hybrid for various environments.

Yield adaptability

With a 120 CRM rating, this hybrid delivers reliable grain and silage yields from Southern NSW to North QLD, across both dryland and irrigated systems.

Disease resistance

Offering strong protection against stalk and cob rots, along with solid Northern Leaf Blight tolerance, this hybrid delivers the disease resilience needed for consistent performance.

Plant vigour

With a tall, upright build and strong early growth, PAC 660 stands out for its resilience, standability, and robust stature.

Silage quality

A powerful dual-purpose performer, this hybrid offers excellent digestibility and volume that is ideal for high-output feed systems.

PAC 660 in the field

Hear from the team behind PAC 660 as they share why this hybrid stands up to pressure and delivers when it counts.

PAC 660

Stability Plot

NSW QLD 2020-24 (5 yrs, 29 trials)

Formula: y = 0.4 + 1.1x , R²= 0.94

Note: The information provided in this graph is a summary. For the full trial data, please reach out directly to our Pacific Seeds team to read the full trial data.

Attributes	Rating
Maturity	120
Grain Yield for Maturity (1 Poor – 9 Excellent)	9
Silage Yield for Maturity (1 Poor – 9 Excellent)	9
Grain Type (Dent – Flint)	6
Silage Quality (1 Low – 9 High)	8
Plant Height (1 Short – 9 Tall)	9
Husk Cover (1 Open – 9 Closed)	8
Dryland Suitability (1 Not – 9 Highly Recommended)	7.5
Northern Leaf Blight (1 Susceptible – 9 Resistant)	6.5
Stalk Rots (1 Susceptible – 9 Resistant)	8
Cob Rots (1 Susceptible – 9 Resistant)	8

Important note: this is a guide only, to make a fully informed choice, please refer to our Advanta Seeds Pty Ltd specific conditions

PAC 660 Technote

Get all the technical detail you need – from planting and population advice to disease resistance and yield performance.

Download technote

FAQs for PAC 660

Comparative Relative Maturity (CRM) is a standardised measure used to compare how long it takes different corn hybrids to reach physiological maturity—specifically, when the grain reaches black layer.

PAC 660 has a CRM rating of 120 days*, placing it in the medium to long maturity category. It’s well suited to regions with longer growing seasons, where maximising yield potential is a key priority.

*Although CRM is expressed in “days”, it’s not a literal count of calendar days. Instead, it reflects a relative measure based on accumulated heat units (growing degree days or GDDs) under standardised conditions. So, a 120 CRM hybrid like PAC 660 typically matures later than hybrids with lower CRM values, but the actual number of days to maturity can vary by environment.

PAC 660 has moderate stay-green, meaning it retains leaf area through grain fill under favourable conditions.

PAC 660 has excellent grain dry-down, helping to reduce the need for artificial drying and allowing for a timely, efficient harvest – especially important in higher-yielding crops or where late-season weather risks exist.

A general recommendation is to plant between 60,000 and 70,000 seeds/ha. However, the optimal population will depend on your paddock conditions, soil type, and seasonal goals. For best results, consult your agronomist or Pacific Seeds technical staff to tailor the population to your farm.

No — PAC 660 is not part of the Imidazolinone Tolerant (IT) range, so IMI herbicides should not be used on this hybrid.

If you need IMI tolerance, look for hybrids with ‘IT’ at the end of their name, which are specifically bred to handle registered IMI herbicides.

PAC 660 is primarily suited for silage, making it a strong first-choice option for high-yielding forage systems. It can also be used for feed grain, offering flexibility depending on seasonal priorities and market demand.