R. Jay Goos and
Brian Johnson, Department of Soil Science, NDSU, Fargo, ND 58105
e-mail: rj.goos@ndsu.edu
Field studies
were set out at five locations in 2007, to measure the resistance of about 140
soybean varieties to iron chlorosis.
The sites were located near Ayr, Colfax, Galchutt, Hunter, and
Galesburg, ND. The sites ranged in
pH from 7.6 to 8.3, salinity (EC) from 0.2 to 2.0 mmho/cm, and CaCO3
contents ranging from 3 to 19 %.
Thirty five seeds were planted in short (5Õ) rows on 30-inch
centers. The experimental design
was a randomized complete block with four replications at each site.
Visual ratings
were made on a 1-5 scale, with 1=representing no chlorosis and 5= the most
severe chlorosis. Ratings
were planned for the 2-3 trifoliolate, 5-6 trifoliolate, and two weeks after
the 5-6 trifoliolate stage. The
Ayr site was completely hailed out after the first rating. The Galchutt site greened up after the
second rating, so a third rating was not taken at this site. Three ratings were made at the other
three sites.
Six ÒstandardÓ
varieties were entered, to help in the interpretation of the results. The varieties, listed in expected order
from the most resistant to most susceptible, were Iowa State ISU A11 > Traill >
Council > Glacier >Mycogen
5072 = Stine 0480. The variety ISU
A11 represents the highest level of chlorosis resistance available in current
breeding lines. All standards were entered twice, to illustrate the
reproducibility of our ratings.
The summary of
the chlorosis scores is shown in Table 1. Each chlorosis rating in Table 1
represents the average of 48 observations taken from five locations. As far as we know, our program of
testing is the most comprehensive program in the USA, with regards to number of
sites and observations.
The 2007 growing
season started out wet, and chlorosis was moderate to severe at all sites. The ÒstandardÓ varieties are listed in
bold typeface in Table 1. The
ranking of the six standards came out exactly as anticipated, and there was a
good reproducibility, typically within 0.1 chlorosis unit.
Chlorosis
severity differs from year to year, and it is impossible to give exact
recommendations as to what level of chlorosis resistance is appropriate for a
specific field. In general, the
more severe the chlorosis a field produces, the higher on the list a farmer
should be, consistent with other agronomic considerations, such as maturity.
This report is
also available online at: www.yellowsoybeans.com
The
authors thank the North Dakota Soybean Council, and the participating seed
companies, for their support of these trials.
Table
1. Average chlorosis scores, across
two ratings and five locations, North Dakota, 2007.
|
Company |
Variety |
Avg |
|
Standard |
ISU A11 |
1.6 |
|
Standard |
ISU A11 |
1.6 |
|
Syngenta |
XR0170 |
1.8 |
|
NuTech |
NT-6051 RR |
2.1 |
|
Gold Country
Seeds |
7806 RR |
2.1 |
|
Univ. of MN |
MN0095 |
2.2 |
|
Asgrow |
AG 00603 |
2.2 |
|
Thunder Seed |
2807 RR |
2.3 |
|
Northstar |
NS 0732 RR |
2.3 |
|
Pioneer |
90A06 |
2.4 |
|
Croplan
Genetics |
RT 0043 |
2.4 |
|
Kruger Seed |
KX - 0067 R |
2.4 |
|
Pioneer |
PH06-07 |
2.4 |
|
Wensman |
W 20051 RR |
2.4 |
|
NuTech |
NT-0706 RR |
2.5 |
|
ProSeed |
RR 60-95 |
2.6 |
|
Croplan
Genetics |
RT 0947 |
2.6 |
|
NuTech |
NT-0066 RR |
2.6 |
|
Standard |
Traill |
2.7 |
|
Standard |
Traill |
2.7 |
|
Syngenta |
NK S14-N1 |
2.7 |
|
Wensman |
W 2064 RR |
2.7 |
|
Asgrow |
AG 00901 |
2.8 |
|
Hefty Seed Co. |
H0086R |
2.8 |
|
Univ. of MN |
MN0502RR |
2.8 |
|
Brushvale |
BS 3001 |
2.8 |
|
Croplan
Genetics |
RT 0207 |
2.8 |
|
Pioneer |
90M92 |
2.8 |
|
Wensman |
W 2030 RR |
2.8 |
|
NDSU |
ND03-2225 (RR) |
2.8 |
|
Peterson Farms
Seed |
PFS 0901 RR |
2.8 |
|
Pioneer |
PH03-07 |
2.8 |
|
Brushvale |
BS 2324 |
2.8 |
|
Kruger Seed |
K-042 RR |
2.8 |
|
Univ. of MN |
MN0806CN |
2.8 |
|
Wensman |
W 20074 RR |
2.8 |
|
Company |
Variety |
Avg |
|
Wensman |
W 20084 RR |
2.8 |
|
Asgrow |
AG 0401 |
2.8 |
|
Gold Country
Seeds |
3805 RR |
2.8 |
|
Hefty Seed Co. |
H026R |
2.8 |
|
NDSU |
ND03-8315 (RR) |
2.8 |
|
Croplan
Genetics |
RT 0077 |
2.8 |
|
Seeds 2000 |
2030 RR |
2.8 |
|
Wensman |
W 2010 RR |
2.8 |
|
Hefty Seed Co. |
H0097R |
2.9 |
|
NuTech |
NT-0090 RR |
2.9 |
|
ProSeed |
RR 60-40 |
2.9 |
|
Dairyland Seed
Co. |
DSR-0303/RR |
2.9 |
|
Seeds 2000 |
2060 RR |
2.9 |
|
Standard |
Council |
2.9 |
|
Peterson Farms
Seed |
PFS 0905 RR |
2.9 |
|
Roughrider
Genetics |
RG 601 RR |
2.9 |
|
Global Soy
Genetics |
CA-104 |
2.9 |
|
NDSU |
Sheyenne |
2.9 |
|
Syngenta |
XR1473 |
2.9 |
|
Thunder Seed |
806 RR |
2.9 |
|
Dyna Gro |
39D11 |
2.9 |
|
Dyna Gro |
32J01 |
2.9 |
|
Gold Country
Seeds |
2801 RR |
2.9 |
|
NuTech |
NT-0330 RR |
2.9 |
|
Stine |
0098-84 |
3.0 |
|
Univ. of MN |
MN0701 |
3.0 |
|
Roughrider
Genetics |
RG 7008 RR |
3.0 |
|
Peterson Farms
Seed |
EX 03 RR |
3.0 |
|
Syngenta |
XR00670 |
3.0 |
|
Croplan
Genetics |
RT 0406 |
3.0 |
|
Pioneer |
90M93 |
3.0 |
|
Roughrider
Genetics |
RG 604 RR |
3.0 |
|
Kruger Seed |
K-091 RR |
3.0 |
|
Dyna Gro |
38C10 |
3.0 |
|
Standard |
Council |
3.0 |
|
Pioneer |
90M02 |
3.0 |
|
Wensman |
W 2108 RR |
3.0 |
|
Company |
Variety |
Avg |
|
Global Soy
Genetics |
CA-107 |
3.1 |
|
Roughrider
Genetics |
RG 603 RR |
3.1 |
|
NuTech |
NT-5025 RR |
3.1 |
|
Kruger Seed |
K-009+RR |
3.1 |
|
NuTech |
NT 6042 |
3.1 |
|
Croplan
Genetics |
RT 0669 |
3.1 |
|
Roughrider
Genetics |
RG 607 RR |
3.1 |
|
Asgrow |
AG 1102 |
3.1 |
|
Brushvale |
BS 3035 |
3.2 |
|
Brushvale |
BS 3050 |
3.2 |
|
Kruger Seed |
K-011RR |
3.2 |
|
NDSU |
ND03-8688 (RR) |
3.2 |
|
Kruger Seed |
K-006 RR |
3.2 |
|
Univ. of MN |
MN1106RR |
3.2 |
|
NDSU |
ND01-2019 |
3.2 |
|
Northstar |
NS 0943 RR |
3.2 |
|
Standard |
Glacier |
3.2 |
|
Asgrow |
AG 0202 |
3.2 |
|
Standard |
Glacier |
3.2 |
|
Stine |
0708-4 |
3.2 |
|
Brushvale |
BS 3029 |
3.2 |
|
Brushvale |
BS 7917 |
3.3 |
|
Dairyland Seed
Co. |
DSR-0401/RR |
3.3 |
|
Syngenta |
NK S00-K5 |
3.3 |
|
Thunder Seed |
2804 RR |
3.3 |
|
Syngenta |
XR1170 |
3.3 |
|
Croplan
Genetics |
RT 0088 S |
3.3 |
|
Dairyland Seed
Co. |
DSR-C700/RR STS |
3.3 |
|
Peterson Farms
Seed |
PFS EX 007 RR |
3.4 |
|
Peterson Farms
Seed |
PFS 0806 RR |
3.4 |
|
Peterson Farms
Seed |
PFS EX 04 RR |
3.4 |
|
Syngenta |
NK S02-M9 |
3.4 |
|
Univ. of MN |
MN0604 |
3.4 |
|
Dyna Gro |
34C06 |
3.4 |
|
Asgrow |
AG 0604 |
3.4 |
|
NDSU |
ND03-8313 (RR) |
3.4 |
|
Pioneer |
PH04-07 |
3.4 |
|
Company |
Variety |
Avg |
|
Kruger Seed |
K - 056 RR |
3.5 |
|
Syngenta |
NK S08-C3 |
3.5 |
|
Peterson Farms
Seed |
PFS 0906 NRR |
3.5 |
|
Unity Seed |
UN-121 |
3.5 |
|
Thunder Seed |
2806 RR |
3.6 |
|
Roughrider
Genetics |
RG 600 RR |
3.6 |
|
Standard |
Stine 0480 |
3.6 |
|
Syngenta |
NK S13-K2 |
3.6 |
|
Dyna Gro |
36B14 |
3.6 |
|
ProSeed |
RR 70-60 N |
3.6 |
|
Dyna Gro |
SX 07713 |
3.7 |
|
Dyna Gro |
32G06 |
3.7 |
|
Standard |
Stine 0480 |
3.8 |
|
Standard |
Mycogen 5072 |
3.8 |
|
Standard |
Mycogen 5072 |
3.8 |
|
Brushvale |
BS 3030 |
4.0 |