http://www.ag.ohio-state.edu/~corn/ |
|
For Week of October 5-18, 1998
C.O.R.N. 98-29
In This Issue:
A) Update on Sampling for Soybean Cyst Nematode Populations
B) Now is an Excellent Time to Soil Test!
Soil samples for the Soybean Cyst Nematode Coalition's program are arriving in Columbus. A few problems have come about as a result of some of the sampling procedures that growers and crop consultants need to be aware of. To date, 200 of samples have arrived for processing in the C. Wayne Ellett Plant and Pest Diagnostic Clinic. Mailings for sample packets of 750 should arrive at producers and consultants farms this week. For fall sampling of soybean cyst nematode please follow the directions carefully. Each soil sample should not cover more than 20 acres. A sample form which is filled out COMPLETELY should be attached to the outside of the bag. It is imperative that sample bags be labeled correctly. When samples arrive at the clinic they are labeled with a tracking number, please use sample bags such as freezer bags that have a white band on them in which the lab can use. Each sample bag is processed separately, so if there are a group of samples please attach a card or a note to each form to indicate such.
Remember that the best estimates for soybean cyst nematode populations can be made from soil samples collected after soybean harvest. This program should give us a very good idea on where SCN is in Ohio and how it is affecting our soybean production.
Soybean Cyst Nematode Coalition Information
Fall is a preferred time to soil test, especially if you believe that you will need to add lime. Taking soil samples after harvest will allow for time to take remedial actions to improve fertility and correct soil pH. With low commodity prices it will be tempting to cut costs by reducing fertilizer inputs. While this may be warranted in some cases the only sure way to determine crop nutrient availability and needs is through a proper soil test.
Fertilizer and lime recommendations based on a soil test are only as good as the sample that is submitted. It is important to get a representative sample of the area that is being tested. The number of samples should be based on the degree of variability in the field being tested. Sample areas should be no larger than 25 acres if soil types are uniform. Larger fields or fields with a high degree of variability should be broken into smaller units based on similar soil types. Take 20 to 30 cores at a uniform depth, they should be taken in a random or zigzag manner to create a composite sample. Depth of the sample cores will vary, from 2 to 8 inches, depending on your tillage practices.
Take care to avoid contamination of soil cores by keeping sampling equipment clean. Using a clean bucket thoroughly mix soil cores to obtain a representative sample, about one pound, to submit to the lab. Your fertilizer dealer or crop consultant may be able to give you more specific instructions on packaging samples for submission to a qualified lab or you can contact your county Extension office for sample bags and instructions for submitting samples to The Ohio State University Research-Extension Analytical Lab at the Ohio Agricultural Research and Development Center in Wooster, Ohio.
You can find a more complete discussion on soil sampling, handling and testing in the Tri-State Fertilizer Recommendations, Extension Bulletin E-2567, 1995 or Soil Sampling, Handling and Testing, OSU Extension Agronomic Fact Sheet AGF-206-95, both are available at your county Extension office.
Note: The next C.O.R.N. Newsletter will be published the week of October 19th.
Readers can subscribe electronically to this newsletter bysending an e-mail message to:
Past versions of C.O.R.N. can be found on the World Wide Web at: http:/www.ag.ohio-state.edu/~corn/archive/
C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.
Contributors to C.O.R.N. this week include:
STATE SPECIALISTS: Pat Lipps & Anne Dorrance (Plant Pathology) and Jeff Stachler (Weed
Science); EXTENSION AGENTS: Roger Bender (Shelby), Larry Lotz (Fayette), Clark Hutson
(Seneca), Barry Ward (Marion), Gary Wilson (Hancock) and Greg La Barge (Fulton).
Editor: Clark Hutson Web Editor: Nathan Watermeier
Information presented above and where tradenames are used, they are supplied with the understanding that nodiscrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.
All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status.
Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Keith L. Smith, Director, Ohio State University Extension.
TDD # 1 (800) 589-8292 (Ohio only) or (614) 292-1868
| C.O.R.N. | Newsletter | Archive | Search | Questions? | Ohioline | Publications |