Corn for Grain Trait Characteristics

CRM:

CRM stands for Comparative Relative Maturity. It is a number used by Pioneer® Seeds Australia to compare the maturity of one corn hybrid compared to another. It is a ‘unit-less’ number and should not be related directly to ‘days’. For example, it is not a number that refers to the number of days from planting until physiological maturity, as this will vary greatly with planting time and seasonal conditions.

Generally, a hybrid with a smaller CRM will flower, fill with grain and be ready for harvest more quickly than a hybrid with a larger CRM. Please consult your local Pioneer® area manager for local knowledge on the relative maturity of hybrids for your growing environment.

Grain yield for maturity:
Valid only to compare hybrids of approximately the same maturity (+ or – 4 CRM). 9 = High grain yield for maturity.

Silage yield for maturity:
Valid to compare hybrids of a similar maturity (CRM). 9 = Completely free of NLB and showing very high resistance. Caution: In conditions where NLB and Eyespot risks are high, growers should only consider planting hybrids with at least moderate resistance ratings of 5 or higher for these diseases.

Husk cover:
Measures the length of the husk leaves extending past the end of the cob, with a loose husk cover scoring one point lower for the same length of husk cover.

Plant height:
9 = Tall. 1 = Short.

Cob Rot resistance:
9 = Shows very high resistance to cob rot.

Dryland adaptability:
9 = Ability to handle hot dry stress conditions.

Northern Leaf Blight (NLB):
9 = Completely free of NLB and showing very high resistance. Caution: In conditions where NLB and Eyespot risks are high, growers should only consider planting hybrid corn seed with at least moderate resistance ratings of 5 or higher for these diseases.

Silage yield for maturity:
Valid to compare hybrids of a similar maturity (CRM). 9 = Completely free of NLB and showing very high resistance. Caution: In conditions where NLB and Eyespot risks are high, growers should only consider planting hybrids with at least moderate resistance ratings of 5 or higher for these diseases.

Staygreen:
A measure of a hybrid’s ability to stay as a green growing plant leading up to black layer (physiological maturity). It is a measure of late-season plant health which may affect plant standability and suitability for silage. A high rating indicates a wider silage “harvest window” providing a greater degree of harvest timing flexibility.

Whole plant digestibility:
Whole plant digestability percentage (DM basis) as predicted by NIR. 9 = Very high whole plant digestibility.

Disease resistance ratings:
8 to 9 = Highly resistant.
6 to 7 = Resistant.
4 to 5 = Moderately resistant.
1 to 3 = Susceptible.
- = Indicates insufficient data.

Growing environment definitions:
May include some or all of the following characteristics:

Challenging yield environments (CYE)

  • Light, sandy or shallow soils of low fertility, predictably low summer rainfall (drought-prone) environments.
  • Exposed sites with very high wind run.
  • High cob, leaf or stalk disease pressure.


Medium yield environments (MYE)

  • Average fertility soils with predictably adequate summer rainfall.
  • Continuously cropped soils.
  • Medium to low cob, leaf or stalk disease pressure.
  • Planting at these populations are recommended for new maize growers and food-grade grain production.


High yield environments (HYE)

  • Deeper, highly fertile and well-structured soils.
  • Predictably good summer rainfall, shelter from high wind run.
  • Good soils straight out of long-term pasture.
  • Low or no cob, leaf or stalk disease pressure.

 

Trait ratingsWord and numeric alignment for yield and agronomic traits
8-9 Excellent, exceptional, outstanding, superb, impressive, industry-leading.
7 Superior, very good, strong, sound, reliable, stable, dependable, consistent.
6 Good, above average, sound, reliable, stable, dependable, consistent.
5 Average, acceptable, adequate, moderate.
4 Acceptable, slightly below average.
1-3 Marginal, susceptible, below average.
Trait ratingsWord and numeric alignment for disease and entomology traits
8-9 Highly resistant, excellent, exceptional, outstanding, impressive.
6-7 Resistant, superior, strong, very good.
4-5 Intermediate, moderate, adequate, acceptable.
1-3 Susceptible (caution on use if disease is prevalent)

Publication Abbreviations

% = Percent
g = gram
m = metre
cm = centimetre
kg = kilogram
ha = hectare
DM = drymatter
bags/ha = bags per hectare
kgDM = kilograms of drymatter
kgDM/ha = kilograms of drymatter per hectare
kgMS = kilograms of milksolids
kgMS/cow = kilograms of milksolids per cow
$/ha = NZ dollars per hectare
MJME = megajoules of metabolisable energy
MJME/kgDM = megajoules of metabolisable energy per
kilogram of drymatter
t/ha = tonnes per hectare
tDM = tonnes of drymatter
tDM/cow = tonnes of drymatter per cow
tDM/ha = tonnes of drymatter per hectare
c/kgDM = cents per kilogram of drymatter

Pioneer® Seeds Australia offers the most extensive range of hybrid corn seed varieties for sale, ensuring that farmers in all regions and cropping environments across Australia can access cost-effective corn seed products that deliver high yields and excellent profitability.

Work with your local Pioneer® area manager to determine current corn grain prices, the most suitable markets to produce grain for and the best hybrid corn seeds to plant. We’re here every step of the way to help you increase the efficiency of your operations and achieve maximum profitability from your investment.