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Aquaculture Division Home |
University of Arkansas, Division of Agriculture
Cooperative Extension Service Soybean Variety Selection (SOYVA) Program User's Guide Table of Contents
Contacts
If additional assistance is
needed, contact Jeremy Ross, Cooperative Extension Service State
Office, (501) 671-2000, e-mail jross@uaex.edu, or Becky Bridges at the Cooperative Extension Service State Office
at (501) 671-2000, e-mail bbridges@uaex.edu. The SOYVA program is a
product of the University of Arkansas Cooperative Extension Service, P.O. Box
391, 2301 S. University Ave., Little Rock, AR 72203, (501) 671-2000. Additional
information regarding Extension programs can be obtained at the Extension web site. This section of the program allows the user to calculate the seeding rate of the field
with user input of desired plant population, type of planter to be used, row
spacing of the planter, seed per lb. to be planted, and germination percentage
of the seed.
The program is then able to provide the user with a calculated seeding rate.
The user must enter acceptable values for the desired plant population
(60000-300000), type of planter to be used, row spacing of the planter (6 - 38
inches), seed per lb. to be planted (2000 - 8000), and the germination
percentage of the seed (0 - 100). The program will then calculate the seed per
acre, number of seeds to plant per foot of row, and the lbs. of seed to plant
per acre. The results can be printed out by selecting File and Print from the browser menu, or the link to recalulate can be chosen to keep the current values and return to the entry screen. If the default values need to be selected again, select the "Calculate Seeding Rate" menu item on the top left-hand corner of the screen.
Arkansas soybean growers are
fortunate to have many soybean varieties from which to select. Currently 75
determinate (Maturity Groups IV, V and VI) and 35 indeterminate (Group IV
and V Maturity) varieties are considered to be adapted to Arkansas growing
conditions by the University of Arkansas Cooperative Extension Service. Variety
selection should consider yield potential and avoidance of environmental,
cultural, and disease problems. The number of cultural and disease problems that
can occur in practice exceeds 100,000 possible combinations. This computer
program, SOYVA, has been developed to select those varieties which avoid a
particular set of problems associated with a given field. SOYVA makes giving
specific field recommendations easier. Factors affecting variety selection in
this program include geographic location, soil texture, planting dates, soybean cyst and root knot nematode problems,
varietal sensitivity to the herbicides propanil and sulfentrazone
(Authority), lodging, soil chloride, and irrigation. SOYVA also considers
varietal resistance to frogeye leafspot, stem canker, and Sudden Death Syndrome
(S.D.S). SOYVA will select varieties from the adapted list and present field
specific variety recommendations sorted into highly recommended, recommended,
and non-recommended categories. The SOYVA program allows the user to view the current and two-year yield
averages for all varieties from six test locations across the state. Once the
recommended and non-recommended varieties are displayed on the screen, a menu
allows the user to select the maturity group of yield averages to view. If
varieties exist in the chosen category, the user then selects the location:
Northeast Research and Extension Center (NEREC), Cotton Branch Experiment
Station (CBES), Vegetable Substation (Kibler), Rice Research and Extension
Center (RREC), Southeast Research and Extension Center-Rohwer, or Southwest
Research and Extension Center (SWREC-Starks Farm). Yields for highly recommended
and recommended varieties are combined and ranked in descending order according
to a two-year yield average. After looking at yields, up to five varieties can
be compared for agronomic characteristics and disease resistance. This
information should better assist the user in selecting adapted varieties for his
fields. The Soybean Variety Selection Program is designed to be as "user-friendly" as
possible. Each question from the ARKANSAS SOYBEAN VARIETY SELECTION PROGRAM DATA
INPUT FORM is arranged in the form of a radio button (where only one answer can
be selected for each question) to make selection of choices easier. Final output
for the program can be either on the screen or on a printer. Once a selection
has been made for all of the choices, select the Compute Results
button. All varieties will then be displayed in one of three categories: highly
recommended, recommended, or not recommended. If no changes are made to the entry screen, results will be calculated based on default answers. Selecting the link to SOYVA Help button from the input screen
will bring up this Help system designed specifically for the SOYVA
program. Selecting the Compute Results button will process
the current answers and divide the supported soybean varieties into highly
recommended, recommended, and not recommended categories based on maturity
group. Selecting the link to RESET SOYVA to default options will clear out all
answers on the screen and replace them with the initial answers found as the
program begins. These default answers also provide the user with a best case
scenario of variety recommendations.
This product was developed by the University of Arkansas
Cooperative Extension Service. The purpose of the product is to provide
assistance to Extension clientele that is consistent with the objectives set
forth by the Cooperative Extension Service. Resale of this product or use of it
for purposes other than its intended use is strictly prohibited. Information put
forth by this product should be used in close consultation with the appropriate
Extension professional. The Cooperative Extension Service is not liable for
damages resulting from recommendations by this product.
2007 version released March 16, 2007. The 2006 version of the program was released on March 20, 2006. The 2005 version of SOYVA was initially released on February 19, 2005. In 2004, metribuzin considerations have been removed from SOYVA. Also, answering "NO" to the Roundup Ready question will EXCLUDE all RR varieties. In prior years, answering "NO" would simply disregard the Roundup consideration in the program.
The Arkansas Cooperative Extension Service offers
its programs to all eligible persons regardless of race, color, national origin,
sex, age, or disability and is an Equal Opportunity Employer.
Acknowledgment is given to Dr. Terry Keisling, Professor of Agronomy, University of
Arkansas, and the late Mr. Ruel Nester, retired Extension Soybean Specialist, for developing the original
logic utilized in this computerized soybean variety selection program. Acknowledgment is given to Dr. R. D. Riggs, Dr. Terry Kirkpatrick, Dr. John Rupe, Dr.
Darrel Widick, Dr. Clay Sneller, and Cliff Coker for their very significant contribution to this
program annually. Acknowledgment is also given to Susan James, secretary in the Department of Information Technology, in proofing this and other
documentation.
Error message: Maturity group must be selected.
When it might occur: If a maturity group has not been selected, but the "Show Yields" button was selected, this message will occur. A maturity group and a location must be selected before selecting "Show Yields."
Error message: Race must be selected since race is known.
When it might occur: If the user selects an S.C.N. problem which indicates the race of the S.C.N is known, but doesn't have an actual race displayed in the drop-down box, this message will appear.
Error message: Number of eggs must be entered since indication was made that number of eggs was known.
When it might occur: If the user selects an S.C.N. problem which indicates the number of eggs/pint of soil is known, but doesn't have an amount entered, this message will appear.
The input screen automatically appears after the introduction
screen. This screen allows the user to enter information about the field and
planting conditions that will be used to determine the category (highly
recommended, recommended, or not recommended) that the supported varieties will
be in. Once the questions have been entered to the user's satisfaction, choosing
the Compute Results button will begin the process of selecting the
categories for the varieties. The link to RESET SOYVA to default options can be chosen at any
time to erase the current answers and change the screen back to the initial
answers. Use the <TAB> key to move between questions, or use the left
mouse button to position the mouse pointer on the desired question and click to
put the focus on that question. The first question asks for a field identification. This is a 10 character
name of the users choice. Press <TAB> to continue to the next field, which
is the field location. To determine the field location, use the map on the DATA
INPUT FORM to select the region. The region selections are Northeast Arkansas,
Southeast Arkansas, Southwest Arkansas, the Arkansas River Valley, and Northwest
Arkansas. The next question is to determine the type of soil texture of the field. The
soil types available are mixed - clay and sandy or silt (100%), silt loam,
or sandy. The next question relates to the expected planting date. The planting dates
available are April 1 - April 24, April 25 - June 7, June 8 - June 30, and July
1 - July 15. The next question asks the user to describe the cyst nematode situation of
the field. The selections available are (1) Soybean Cyst Nematodes are not a
problem, (2) Race of SCN known, but not the number of SCN eggs/pint of soil, (3)
Number of SCN eggs/pint of soil and race known, or (4) SCN is a problem, but
current race or general analysis not available. If SCN is not a problem, the question regarding SCN will be bypassed. If the
SCN race is known, the user is asked to select from race 2, 5, or 6. If the number of SCN eggs/pint of soil and SCN race are known, the user will
be asked to enter the number of eggs/pint of soil. If SCN is a problem but race and number of eggs per pint of soil are unknown,
pertanent information is displayed in the "information box" located between the
input questions and the control buttons informing the user of available options
for minimizing yield losses due to SCN by planting appropriate resistant
variety(ies). The next input comes in the form of radio buttons, which inquire as to
specific field conditions, such as root knot, propanil injury, the
use of sulfentrazone, the use of ROUNDUP, the use of STS soybeans, lodging,
frogeye leaf spot, stem canker, sudden death syndrome, and high soil chloride
levels. Corrections can be made at any time before the Compute Results
button is chosen. When the Compute Results button is selected, the results would then
be displayed based on input data and according to maturity group and level of
recommendation. To view additional varieties, use the scroll bar to move down the screen if needed. There are extra navigation buttons at the top of this new screen to allow the user to jump to different areas of the screen without having to scroll.
Users may select the link to go directly to the Highly Recommended, Recommended or Not Recommended lists. There is also a link to return to the previous position on the screen; this is to be used after the page has been reloaded, such as after pressing the Show Yields button, or after sorting by variety or 2-year yield average. Since control usually returns to the top of the page, this link can be selected to go to the location where the focus was before the page was refreshed.
At this point, the user may choose to view yields for certain varieties.
The user can view averages by selecting the maturity group category (IV, V, and VI) from the first drop-down box and then
the test location from the second drop down box. Each maturity group has a different set of locations to
select from. Some of the available locations are NEREC (Keiser), CBES
(Marianna), RREC (Stuttgart), SEREC (Rohwer), SWREC (Starks Farm), and Kibler. For those locations not containing yield data, an indication will be made on the dropdown list. Selecting a location with no yield data will display all zeroes for yield information.
Make sure to select from both the maturity group box and the location box, and then select the SHOW YIELDS button, which
redisplays the screen, this time including the yield information. The
variety yield averages for the location selected are then displayed, showing
previous year's average and the two year average where applicable, and sorted alphabetically by variety name.
After the yields are displayed, they can be sorted alphabetically by variety name, by the previous year's yield average, or by the two-year averages by selecting the linked heading for that particular column. The first column in the yield table contains a check box. The user may select as many varieties as needed so that characteristics of those chosen varieties can be viewed.
Once the desired varieties have been selected, select the View
Characteristics of Selected Varieties button. The screen will then be refreshed and display all of the previous information as well as the characteristics
for the selected varieties. Information displayed includes the maturity
group, the height, lodging, root knot, frogeye, stem canker, SDS, SCN
rating, propanil, sulfentrazone and chloride characteristics. The Select All button will automatically select all view characteristics of all varieties, and the Clear All button will remove all checks.
Additional information that appears at the bottom of the screen includes information on SCN and Aerial blight. The last link found on the page is a link to create a printer-friendly report. While the screen can be printed at any time during the run of the program using the File/Print option from the browser, this will also print out all graphics and buttons, which creates a lengthy report. Selecting to create the printer-friendly report removes all unnecessary items. Selecting this option will open a brand-new window. Once the report has been printed, close the new window (by selecting the X in the upper right-hand corner) and return automatically to the SOYVA program.
|
| 1- NE | 4 - ARV |
| 2 - SE | 5 - NW |
| 3 - SW |
___ 2. What type soil texture do you have?
| 4 - Sandy | |
| 2 - Mixed - Clay and Sandy or Silt (50% clay) | |
| 3 - Silt Loam |
____ 3. When do you plan to plant?
| 1 - April 1 to April 24 | 4 - July l to July l5 |
| 2 - April 25 to June 7 | |
| 3 - June 8 to June 30 |
___ 4. Will this field be irrigated? 1 - Yes or 2 - No
___ 5. Number of (CN) eggs/pint of soil.
___ 6. Do you have a cyst nematode (CN) problem?
| 1 - No Problem | 7 - Race 6 |
| 3 - Race 2 | 6 - Race 5 |
___ 7. Do you have a Root Knot Problem? 1 - Yes or 2- No
___ 8. Is propanil (Stam, etc.) injury a potential problem? 1 - Yes or 2- No
___ 9. Do you plan to use Sulfentrazone (Canopy XL)? 1 - Yes or 2- No
___ 10. Do you lan to plant STS soybeans? 1 - Yes or 2- No
___ 11. Do you have trouble with lodging? 1 - Yes or 2- No
___ 12. Is Frogeye Leaf Spot a serious problem? 1 - Yes or 2- No
(Note that Frogeye Leaf Spot can be eftectively controlled by "timely application" of
a recommended fungicide in lieu of the varietal resistance route.)
___ 13. Is Stem Canker a problem? 1 - Yes or 2- No
___ 14. Is Sudden Death Syndrome (S.D.S.) a serious problem? 1 - Yes or 2 - No
___ 15. Does this field have high levels of soil chloride? 1 - Yes or 2 - No
(Don't assume that high soluble salts constitute a chloride ion problem. Chloride
levels should be determined by irrigation water tests and/or plant tissue analysis.)
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