Recommendations For Planting Large Soybean Seed

 

 

Large soybean seed may create some challenges. Understanding the challenges and the strategies for overcoming them will improve seed performance in 2017.

 

Soybean seed quality is very good this year. Mechanical damage to the seed coats or embryos is very low because the seed was harvested at nearly ideal moisture levels. However, some of the seed is quite large at 2,100 to 2,400 seeds per pound. Seed size within a given variety can vary by as much as 20 percent and is determined by the environmental conditions occurring during the growing season. The abundant precipitation that occurred in August and early September favored the production of larger seed in 2016.

 

For a given variety, the size of the seed planted does not affect the yield potential as long as seed quality is high. However, the large seed may cause some management challenges for producers. Understanding these challenges and the strategies for overcoming them will improve seed performance in 2017.

 

The first step is to determine the size of the seed for each of your seed lots. The next step is to seek information from your operator’s manual, seed supplier and equipment dealer about equipping and setting your planter or drill to handle this year’s seed sizes. Taking these steps now will prevent problems at planting. Large seed – 2,400 seeds per pound or less – can be damaged by the fluted metering system in drills. This type of damage can be reduced by plugging every other feed cup and opening up the seed metering gates. Some drills allow the feed cup to be lowered, increasing the space between the fluted seed metering mechanism and the bottom of the feed cup. Check your operator’s manual for specific recommendations.

 

Large seed (2,400 seeds per pound or less) can be damaged by the fluted metering system in drills. This type of damage can be reduced by plugging every other feed cup and opening up the seed metering gates. Some drills allow the feed cup to be lowered, increasing the space between the fluted seed metering mechanism and the bottom of the feed cup. Check your operator’s manual for specific recommendations.

 

Another potential concern with large seed is that the seed may have enlarged so quickly last summer that it caused growth cracks in the seed coats. This is not a problem in 2017.

 

Large seed produces larger cotyledons (seed leaves) than small seed. The larger cotyledons are more difficult to lift out of the soil during emergence. This may cause emergence problems on fine-textured soils prone to crusting. Planting the seed in wide rows and increasing the planting rate slightly is usually beneficial as the seeds are spaced closely enough within the row to crack the crust (see photos).

 

 

Also, consider planting slightly shallower and maintain residue cover over the row. In some cases, a timely rotary hoeing may be required to break the crust. Please see the Michigan State University Extension article “Improving soybean emergence on soils prone to crusting.” The loss of one cotyledon on a few plants during emergence will not affect yield. However, if a large percentage of plants lose one or both cotyledons, yields will be significantly reduced.

 

All soybean seed must imbibe 50 percent of its weight in water during germination. Large soybean seed must imbibe more water to germinate than small seed. This may lead to delayed or uneven emergence under marginal soil moisture conditions. Most agronomists recommend planting soybean seed into at least 0.5 inches of moist soil to promote uniform germination and emergence. This recommendation is even more important with large soybean seed.

 

This article was produced by the SMaRT project (Soybean Management and Research Technology). The SMaRT project was developed to help Michigan producers increase soybean yields and farm profitability. SMaRT is a partnership between MSU Extension and the Michigan Soybean Checkoff program.

 

Video: Winter Canola Trial in Mississippi | Can It Work for Double Cropping? | Pioneer Agronomy

Can winter canola open new opportunities for growers in the Mid-South? In this agronomy update from Noxubee County, Mississippi, Pioneer agronomist Gus Eifling shares an early look at a first-year winter canola trial and what farmers are learning from the field.

Planted in late October on 30-inch rows, the crop is now entering the bloom stage and progressing quickly. In this video, we walk through current field conditions, fertility management, and how timing could make this crop a valuable option for double-cropping soybeans or cotton.

If harvest timing lines up with early May, growers may be able to transition directly into another crop during ideal planting windows. Ongoing field trials will help determine whether canola could become a viable rotational option for the region.

Watch for:

How winter canola is performing in its first season in this Mississippi field

Why growers chose 30-inch rows for this trial

What the crop looks like as it moves from bolting into bloom

Fertility strategy, including nitrogen and sulfur applications

How canola harvest timing could enable double-cropping with soybeans or cotton

Upcoming trials comparing soybeans after canola vs. traditional planting

As more growers look for ways to maximize acres and diversify rotations, experiments like this help determine what new crops might fit into existing systems.