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Vol 3 Issue 2 - March 17, 2023

NW Iowa Crop News

Newsletter for current topics in crops for the counties of Buena Vista, Clay, Dickinson, Emmet, Hancock, Kossuth, Palo Alto, Pocahontas, and Winnebago Counties.

GentrySorenson-3601 final.jpg

Gentry Sorenson

Extension and Outreach Field Agronomist for NW Iowa


Iowa State University Extension and Outreach

1121 Hwy 18 E Algona, IA 50511

[email protected]

Phone 515-295-2469



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Helpful Links and Resources

ISU Integrated Crop Management
Plant and Insect Diagnostic Clinic
Agribusiness Association of Iowa
Crop Protection Network
I Seed Dead Plants Podcast
War on Weeds Podcast
Iowa State Crops Team YouTube Website
Digital Ag Team Planting Resources

Over the Top Dicamba New Cutoff Date

On February 16th the EPA approved label amendments for additional restrictions for over-the-top dicamba in Iowa. The restrictions included a new cut-off date for over-the-top dicamba use. I have included a link to the article written by Dr. Prashant Jha which can be found here or in the link below.

New cut -off date for over-the-top-dicamba use

Updated Crop Nutrient Recommendations

PM 1688 the General Guide for Crop Nutrient and Limestone Recommendations in Iowa was updated recently. This publication was last updated in 2013. Through new research and understanding of response data an updated publication has been developed. There are two areas that have changed in the publication. Please take a look at the article written by Antonio Mallarino that describes the changes made to PM 1688 as well as what did not change. A link to PM 1688 and the article has been provided in the red boxes below.

Updated P and K Guidelines
PM 1688

We want to hear from you!

As technology continues to evolve, Iowa State University Extension and Outreach is launching a statewide survey that will help us deliver the research-based education and resources you want, in ways that fit you best. And as a friend of extension, your voice is an important one.

Your responses will tell us about the technology you prefer, the topics you want to learn more about, and the issues that are important to you. What we learn will help us improve on the way Iowans access, receive, and engage with extension education. Please take a few minutes and complete the survey in the link below in the red box titled "Statewide Audience Assessment Survey" and share with others - those we know and those we may not have reached yet. Thank you!

Statewide Audience Assessment Survey

Making the Best of a Thin Situation

An article was written recently on frost seeding and interseeding of pastures. If your pasture was stressed due to drought conditions and is now on the thinner side, please check out the resources in the article that is provided in the link box, or it can also be found here.

Making the Best of a Thin Situation

Waterhemp Resources

During private pesticide training, I provided some information at the end of the training on waterhemp. I have received a few questions on where to find some of the information provided in this training for further review. In the below red link boxes, I have included the publications for reference.

Soybean Postemergence Herbicide Failed is Retreatment Warranted
Which Residual Herbicide Should I Use For Waterhemp Control in Soybeans

Upcoming Keys to early season soybean success: Webinar

Please join an upcoming webinar on new research and materials for soybean producers. There are three webinars in this series that are put together by extension specialists from land grant universities. Topics include N-Fixation and Sulfur Fertility in Soybeans, What's New in Planter Technologies.

Webinar: Keys to early season soybean sucess

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