Predicting when Michigan soybean fields will reach physiological maturity

Sep 20, 2019

A new tool called SoyWater can help predict when soybean fields will reach physiological maturity, or the R7 growth stage.

Due to delayed planting problems and cooler than normal temperatures occurring this growing season, many producers are wondering if their late-planted soybean fields will reach physiological maturity before a killing frost. Physiological maturity (the R7 growth stage) is reached when one pod has attained its mature color on 50% of the plants in the field. In most cases, this occurs after nearly all the leaves turned yellow and are dropping off the plants (see photo). After the plants reach the R7 growth stage, the field will no longer be at risk of incurring yield losses due to frost or freeze damage.

Thanks to the combined efforts of Michigan State University Extension, the University of Nebraska at Lincoln and the Michigan Soybean Checkoff, Michigan soybean producers have access to a new tool called SoyWater that can be used to help predict when their fields will reach R7. SoyWater is a web-based irrigation scheduling program that has a soybean growth stage development model called SoySim embedded within it. SoyWater was developed at the University of Nebraska and has been adapted to incorporate weather data from the MSU Enviroweather stations. The program is free of charge.

SoyWater was used to determine the projected dates when soybeans planted on June 30 will reach physiological maturity in Lenawee, Gratiot and Sanilac counties (see table). These counties were selected as they are major soybean producing counties that experienced some of the worst planting delays in 2019. To demonstrate the effect that maturity group has on soybean maturity, the latest and the earliest adapted maturity groups for each location were entered. Based on the SoyWater projection, a 3.2 maturity group soybean variety planted in Lenawee County on June 30 is predicted to reach R7 on Oct. 19. However, historical weather records show there is a 50% chance that a killing frost of 28 degrees Fahrenheit will occur on Oct. 18. Remember that the R7 dates provided by SoyWater are estimates and may not precisely match the actual R7 dates in your fields.

Click here to see more...

Video: The new CLAAS ARION 6 CMATIC: Versatility, performance & comfort – in fields, on roads and in yards.

Hard work made truly comfortable? Challenge accepted. 💪

The new CLAAS ARION 6 CMATIC tractor combines continously variable CMATIC transmission, the CEBIS operating system and innovative assistance features to make every job easier and more efficient – in the field, on the road and around the yard. With its versatility, modern design and driver comfort, the ARION 6 CMATIC is the reliable farm tractor for everyday work.

👉 The highlights of the CLAAS ARION 6 CMATIC:

• Works anywhere – whether ploughing, transport or yard work, the ARION 6 CMATIC delivers across all jobs

• Continuously variable CMATIC transmission – smooth, fuel-efficient, powerful and always in the right speed range

• Assistance systems that make everyday work easier – you get out of the cab more relaxed at the end of the day

• Strong engine with plenty of power whenever it’s needed – you stay on top of every task

• High driving comfort, even on long days – supporting you so you can keep going when it counts

• Spacious cab with clear layout and good visibility – stay comfortable, avoid strain and keep everything in view

• Built for the future – in looks and in technology, a tractor ready for every challenge ahead

The new CLAAS ARION 6 CMATIC is more than a powerful tractor – it’s a reliable partner on your farm. It combines efficiency, comfort and innovation – making it a strong choice for contractors and farming businesses alike.With the ARION 6 CMATIC you add real comfort and versatility to your work – whether you’re in the field, hauling on the road or working around the yard.