JenREES 3/27/22

Grateful for a little moisture last week! Lots to share based on questions. For those with poultry, the highly pathogenic avian influenza (HPAI) has impacted a fourth Nebraska farm. Farms impacted thus far have been in Merrick, Butler, and Holt counties. All were under quarantine with birds being humanely depopulated and disposed of in an approved manner. HPAI is a highly contagious virus that spreads easily among birds through nasal and eye secretions, as well as manure. The virus can be spread in various ways from flock to flock, including by wild birds, through contact with infected poultry, by equipment, and on the clothing and shoes of caretakers. Wild birds can carry the virus without becoming sick, while domesticated birds can become very sick. Symptoms of HPAI in poultry include: a decrease in water consumption; lack of energy and appetite; decreased egg production or soft-shelled, misshapen eggs; nasal discharge, coughing, sneezing; incoordination; and diarrhea. HPAI can also cause sudden death in birds even if they aren’t showing any other symptoms. Poultry owners should restrict access to your property and poultry and report unusual poultry bird deaths or sick birds to NDA at 402-471-2351, or through USDA at 866-536-7593. More info: https://nda.nebraska.gov/animal/avian/index.html

Preliminary farm real estate numbers were released this week at: https://cap.unl.edu/realestate.

Weed Guides: We didn’t receive 2022 weed guides. I do have some flash drives with PDF copies for those interested. Otherwise, print copies can be purchased at: https://marketplace.unl.edu/default/ec130.html.

CropWatch at cropwatch.unl.edu covers a variety of topics including drought outlook and BT trait table.

On-Farm Research Results Book: PDF version can be viewed at: https://go.unl.edu/vfi4.

Nutrient Management: If you’re applying fertilizer this spring or in-season, it may be an opportunity to cut back on fertilizer rates in some strips. Protocols for consideration that can be adjusted at: https://jenreesources.com/2022/02/06/jenrees-2-6-22/.

Also received questions regarding starter fertilizer. Javed Iqbal and Laura Thompson shared the following in this week’s CropWatch, “From 1995 to 2019, farmers working with the Nebraska On-Farm Research Network conducted 35 studies looking at starter fertilizer on corn. The results of these studies can be found in the Results Finder database at http://resultsfinder.unl.edu/. Some were in the same field for a number of years, others moved around. Various starter materials were evaluated, and not all studies reported soil test Phosphorus (P) levels.” UNL’s critical soil test levels for P are when Bray-P is less than 20 ppm for corn after corn (C/C) or 15 ppm for corn after soybean (C/S). The information below is focused on studies comparing 10-34-0 to no starter.

“Eighteen of the studies compared a 10-34-0 starter fertilizer in the range of 4-6 gal/ac to a no starter check. Soil P levels were between 4 and 35 ppm. The crop yield response across range of soil P levels:

  • For soils with P soil tests at or below 10 ppm, there was an average yield increase of 14.3 bu/ac due to the starter (four sites).
  • For soils with P soil tests of 10-20 ppm, there was an average increase of 2.6 bu/ac (five sites).
  • For soils with P soil tests of 20-35 ppm, there was an average increase of 0.3 bu/ac (nine sites).
  • When all the data were combined, regardless of soil test values, there was an average increase of 4 bu/ac.

In spite of this analysis, of the 18 studies, only five had statistically significant differences. Of these five, the average yield increase was 12 bu/acre and the average soil test P level was 9 ppm.

To summarize, when fertilizer is used as a starter (as defined above with soil test levels above the critical value), the data shows that it is largely not effective in terms of yield or economical response (even though plants with starter applied will be greener early on); however, if the fertilizer is added to a soil that tests low for soil test P (less than the critical value), a yield response to that fertilizer is expected.

A similar analysis of the soybean on-farm research found six starter studies between 1992 and 2015, with only three sites reporting soil test P, all of which were greater than 17 ppm. Average yields for the no-starter studies were 61.2 bu/ac and for soybeans with starter, 61.3 bu/ac.” If you’re interested in trying this for yourself in corn or soy, consider this simple protocol

About jenreesources

I'm the Crops and Water Extension Educator for York and Seward counties in Nebraska with a focus in irrigated crop production and plant pathology.

Posted on March 27, 2022, in JenREES Columns, on-farm research and tagged , , , . Bookmark the permalink. Leave a comment.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: