Recent Updates

Research and education-Two surveys

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The purpose of these two surveys as part of a multi-institution grant on climate change research and education is to gain additional insight on the ‘Water quality’ and ‘Soil carbon markets’ issues.  The time required to complete these surveys should be no more than 10 minutes. Please complete the surveys. If you have any additional questions regarding these surveys, please contact the lead PI, Dr. Rachna Tewari, at rtewari@utm.edu

PS: This being an exploratory study, anyone engaged in agriculture or livestock production of any scale could complete the survey.  The survey has been approved by UTM IRB as an exempt study.

Water quality:

https://utk.questionpro.com/a/TakeSurvey?tt=3JvQhqvdhp%2BCCR4ED4Ig2ntMHws332I/

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The NEW IRRIGATION page!!

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If you haven’t noticed, now you can access to Tennessee row crop irrigation page through our UTcrops.com. You can go to UTcrops.com then click on ‘Irrigation’. Or you can check the link below for direct access to the irrigation information. The UTcrops.com website gives you ready access to essentially all UT resources related to row crop production.

https://irrigation.tennessee.edu/

https://utcrops.com/

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Start Scouting for Palmer Amaranth that Escapes Dicamba or 2,4-D

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(Picture 1) Dicamba + glyphosate on 3″ Palmer 4 DAA

This picture (Picture 1) was taken just 4 days after a dicamba + glyphosate + clethodim application on 3” Palmer amaranth. Judging from some experience with this Palmer population, the growth after application would suggest it will likely survive. When we revisited the site indeed it had (Picture 2). Fields infested with similar Palmer populations are scattered about in a few counties in West and Middle TN. As such, there will be no substitute for first hand observation to determine if Palmer amaranth is recovering from a dicamba or Enlist application.

In our research more dicamba sensitive Palmer amaranth will often be dead or well on their way under good heat and moisture conditions in 7 days or so.  Palmer that is showing regrowth from the apical meristem or lateral buds around  7 to 10 days after application often will live. Experience from last year would indicate that not only will they live but after a short pause will become quite competitive. Continue reading

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UT Fertilizer Recommendations for Optimal Corn Productivity- Focus on K

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This is the third article in a series of blog articles that will focus on some fundamental information on UT fertilizer recommendations for corn, with a different nutrient featured in each article. Commonly recommended nutrients for use in corn production in TN include nitrogen (N), phosphorus (P), potassium (K), sulfur (S), and zinc (Zn). Each nutrient will be discussed in terms of the relevant soil test that may be used or used in recommendation; recommended preplant, starter, sidedress, and foliar fertilizer applications; and plant/tissue analysis. Today’s blog will focus on UT potassium recommendations for optimal corn productivity under conditions in TN. Potassium is a macronutrient that plays important functions in the plant including protein and starch formation in the grain, movement of water, nutrients, and carbohydrate within the plant, stomata closure, cell wall and stalk strength. Thus, corn plants with inadequate K are susceptible to drought stress, diseases and insects, and greater risk of lodging after maturity. Additionally, K-deficient corn plants may have shorter ear length and narrower ear diameter.

 

Soil test for potassium

Potassium fertilizer application rate should be based on soil test. In TN, K fertilizer recommendations are based on Mehlich I extraction procedure because it correlates well with the soils in Tennessee. Detailed information on how UT recommendations were developed is addressed in UT Publication W795, University of Tennessee Fertilizer Recommendation Development. Recently, a calibration for Mehlich III was established for west TN soils and ranges of sufficiency for soil K using Mehlich III testing are described in the UT Publication, UT Fertility Recommendations for Tennessee Row Crops.

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Reminder: UT Cotton Scout School (Friday, May 28, 2021)

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The UT Cotton Scout School is scheduled for the last Friday of the month, May 28st, at the West Tennessee Research and Education Center (605 Airways Blvd, Jackson). There is no fee, and preregistration is not required. Registration begins at 8:00 AM with the program starting at 8:30. Content will include classroom and hands-on training with an optional ‘go-to-the-field session’ after a box lunch. Topics covered will include cotton development and identification and symptoms of insect pests, plant diseases, and weeds.

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Ryegrass and Johnsongrass Management: Where Do We Go From Here?

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Ryegrass in corn escapes glyphosate + dicamba burndown

This has ,clearly, been the worst year for ryegrass in the state in both corn and wheat.  There are a good many corn fields that are clean where the burndown was glyphosate + clethodim.  Fields where dicamba was added in the burndown are, in most cases, the most infested with ryegrass.  As mentioned in a previous blog, other than just going out and spraying the typical POST corn application and hoping that pushes the ryegrass on to maturity there is no real solution to controlling it. Continue reading

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UT Weed Tour (Wednesday June 16, 2021)

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JACKSON, Tenn. – The University of Tennessee Institute of Agriculture will host the annual Weed Tour on Wednesday, June 16 at the West Tennessee AgResearch and Education Center. The guided tour will feature 60 weed management research tests in corn, soybean and cotton as well as a demonstration of herbicide symptomology. Continue reading

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UT Fertilizer Recommendations for Optimal Corn Productivity

This is the second article in a series of blog articles that will focus on some fundamental information on UT fertilizer recommendations for corn, with a different nutrient featured in each article. Commonly recommended nutrients for use in corn production in TN include nitrogen (N), phosphorus (P), potassium (K), sulfur (S), and zinc (Zn). Each nutrient will be discussed in terms of the relevant soil test that maybe used or used in recommendation; recommended preplant, starter, sidedress, and foliar fertilizer applications; and plant/tissue analysis. Today’s focus will be on phosphorus (P).

UT phosphorus (P) fertilizer recommendations for optimal corn productivity

Today’s blog will focus on UT phosphorus recommendations for optimal corn productivity under conditions in TN. Phosphorus plays an important role in plant reproduction especially pollination and kernel setting. In adequate P can reduce stalk strength, delay crop maturity,  poor kernel set and lead to yield loss.

Soil test for phosphorus

UT Publication PB 1645, Best Management Practices for Phosphorus in the Environment provides an excellent review on phosphorus. Phosphorus fertilizer application rate should be based on soil test. In TN, P fertilizer recommendations are based on Mehlich I extraction procedure because it correlates well with the soils in Tennessee. However, a calibration for Mehlich III has been established for west TN soils is described in the UT Publication SP763, UT fertility recommendations for Tennessee row crops. Detailed information on how UT recommendation was developed is addressed in UT Publication W795, University of Tennessee Fertilizer Recommendation Development. Row crop sustainability. Extension Publication, SP763. Continue reading

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