Home Crop Monitoring Soybean School: Larger nodules help soybeans compensate during dry conditions

Soybean School: Larger nodules help soybeans compensate during dry conditions


Sufficient root nodulation is important for filling soybean pods with seed, as there’s a robust correlation between the variety of nodules on soybean crops’ roots and yield.

However in a dry yr, the variety of nodules won’t matter fairly as a lot, as soybeans can compensate for lowered nodulation by producing bigger nodules.

As a part of this Soybean College episode, we seize a shovel and head to the sphere as soon as once more with Cassandra Tkachuk, manufacturing specialist with Manitoba Pulse and Soybean Growers, to check out what’s occurring beneath the soil floor on the roots of drought-stressed crops.

“Our research has shown you want at least 10 nodules per root system for maximum yield potential,” she explains. “That particular study didn’t look at nodule size, but under drought conditions, nodule size can actually play a role, where the larger the nodule, the less susceptible it is to drought.”

“We’re seeing a lot of that this summer, which is a good sign,” continues Tkachuk, within the video beneath.

She emphasizes the significance of assessing root nodules annually, no matter rising conditions, previous soybean efficiency, or inoculant practices. The best time to evaluate nodulation is on the R1 (starting bloom) stage, as there’s nonetheless a possibility for a rescue nitrogen therapy.

Along with a shovel to softly dig out every plant, a pail of water could also be wanted to soak the roots to take away the connected soil, particularly in dry clay soils. Tkachuk demonstrates tips on how to reduce every nodule open to evaluate the color inside. If nodules are a pinkish-red inside, the Bradyrhizobium micro organism within the nodules are actively fixing N.

MPSG’s Cassandra Tkachuk discusses nodulation, inoculants, and the impression on drought on nitrogen fixation as a part of this Soybean College video:

Associated Soybean College episode: Rescuing soybeans affected by poor nodulation


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