Trait Characteristics

CRM:

CRM stands for Comparative Relative Maturity.  It is a number used by Pioneer 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 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 (+ or - CRM). 9 = High silage yield for maturity.

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 hybrids 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 digestability.

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