Agronomy eUpdate August 3rd, 2023

Issue 968

Nitrate toxicity in drought-stressed corn and sorghum

Drought-stressed crops such as corn and sorghum tend to accumulate high nitrate levels in the lower leaves and stalk of the plant. It is wise for producers to test their drought-stricken forage prior to harvest. Levels of nitrates can increase in drought-stressed plants after a rain and delaying harvest may be beneficial.

sorghum corn forage drought drought stress nitrate toxicity 

Biomass production and nutrient uptake of drought-damaged corn

A number of factors should be considered when assigning a value to drought-damaged corn. Nutrient removal from the field is one key aspect since biomass can export significant amounts of nutrients. Other factors to consider include the need for residue cover to prevent erosion and conserving soil moisture.

Corn Schools drought nutrient levels drought stress 

Allow time for lime applications when planting alfalfa this fall

Correcting acidic soil conditions through the application of lime can have a significant impact on crop yields, especially for alfalfa. Liming is one of the most essential, but often overlooked, management decisions a producer can make for alfalfa production.

alfalfa lime application soil pH 

Southern rust is in Kansas and spreading quickly

Southern rust in corn has officially been confirmed in Kansas for this growing season. As of August 3, six counties in central Kansas have confirmed cases of southern rust. Producers are encouraged to scout their fields and report any suspected disease outbreaks. Learn more in this article.

corn disease southern rust 

Tar Spot of corn is confirmed in five counties in Kansas

Tar spot of corn has been confirmed in five counties in Kansas. Fungicides are an effective tool for controlling tar spot if applied at the appropriate time. A well-timed, informed fungicide application will be important to reduce disease severity when it is needed. Learn more about if and when a fungicide application will be beneficial.

corn disease fungicide tar spot 

Extreme heat and Kansas farm income

Moderate or severe drought is prevailing through much of the Corn Belt and many areas of Kansas, Missouri, and Nebraska are experiencing extreme drought. New research is summarized in this article on the impact of extreme heat and the profitability of Kansas farms.

drought high temperatures crop insurance hot weather farm stress 

July weather summary for Kansas - A cool start, a hot finish

In an eUpdate article last month, we examined the counts of 90-degree days across Kansas this summer. However, a recent stretch of hot weather has nearly erased the negative departure for the first three weeks of July. This article summarizes the month of July in terms of temperature and stress degree days.

weather Climate hot weather degree days 

Western Kansas Fall Field Days set for three locations in late August

Join K-State agronomists and extension specialists at one or more of the Western Kansas Fall Field Days. A series of three programs will take place in late August in Tribune, Hays, and Garden City. These events are open to the public and are free to attend with a meal provided at each location.

Western KS Field Day Fall Field Day  

Flickner Innovation Farm Field Day - August 10

The Flickner Innovation Farm is hosting a field day on Aug. 10 to highlight current work by local producers, national and state industry members, and Kansas State University researchers to effectively manage weeds through technology and precision ag management strategies. The event is free and lunch will be provided.

Field Day Flickner Innovation Farm KCARE