Drought-stressed soybeans can make silage

Hoard's Dairyman: 

Drought-stressed soybeans can make silage

Date: 
Fri, 08/17/2012

by Steve Larson, Hoard's Dairyman Managing Editor

Chopping or baling soybeans can help fill forage needs. That’s the message from the University of Illinois’ Mike Hutjens who has posted a 7-minute video discussion on the subject. You can find it and some related information at: http://go.illinois.edu/drought.

Hutjens says the best time to chop would be when soybeans are in the R3 stage of development . . . just beginning to develop pods. At that stage, one of the top four nodes of the plant with a fully developed leaf has a 3/16-inch pod.

He recommends wilting to between 35 and 45 percent dry matter . . . on the drier side for upright silos . . . on the wetter side for bags and bunkers. Set choppers for a 3/8-inch theoretical length of cut. Use an inoculant similar to what you would use for hay silage.

The yield may be in the range of 1 to 2 tons (as fed) per acre.

At the R3 stage, you might expect forage with 18 percent protein, 46 percent NDF and 32 percent ADF. At the R5 stage (beginning to make seed), protein would be about the same, but NDF would be more like 46 and ADF about 34.

At the R7 stage (beginning maturity), NDF might drop to 40 percent because there would be more seed and ADF might drop to 29 or so.

There will be a lot of moisture in the soybean plants, and it may be a challenge to get them dry enough to bale. You may need to use a propionic acid preservative, Hutjens cautions.

He urges people to check on any herbicides and insecticides that may have been applied to the soybeans. Make sure there is no risk of toxicity or contamination of milk or meat.

Hutjens says a potential seed yield of 20 bushels per acre may be the chop/combine break point. At $15 per bushel, 20 bushels of seed is $300. If hay is worth $200 per ton and you get 1-1/2 tons of dry matter per acre, the forage also would be worth $300.

drought-stressed corn

Special Webinar: Drought Strategies

With limited forages this year, a special webinar has been added to address the options for producers to examine additional forage possibilities. “Sorting through your forage supply options” will be presented by Mike Hutjens, University of Illinois. Hutjens expressed great interest in making this a very interactive webinar, wanting input from the attendees as to their current situation, so everyone can learn from others and gain some insight so they are better prepared to tackle their forage needs. Join us Monday, August 27 at 12 noon (Central time) for this webinar. Biotal Forage Inoculants (www.qualitysilage.com) stepped forward to sponsor this webinar.

If you already have registered for any of the free webinars, you will automatically receive a link to watch this webinar. If you want to participate, visit www.hoards.com/webinars or go directly to the enrollment page.

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