BEET SEED: Producing Sugarbeet Seed

Producing Sugarbeet Seed

The Willamette Valley is the source for all sugarbeet seed used in North America. Mild winters, low disease pressure and dry harvest weather makes the area desirable for growing seed. During World War I and II, the supply of seed from Europe was insufficient, which required seed companies to find a growing area in North America. West Coast Beet Seed is jointly owned by a group of sugarbeet seed and sugar companies.

WCBS grows sugarbeet hybrid seed and parental stocks. Stock seed productions often are grown in plots from 0.1 to 5 acres and need isolation from commercial productions and other stock seed productions. Appropriate isolation may be several miles from the nearest commercial seed production field. Much of the work is done by hand including rogueing to remove undesirable and off type plants. The goal is to produce uniform seed for the variety planted for eventual commercial hybrid production.

Commercial fields (typically 10 to 50 acres) are planted in late Aug or early Sept. Seed is supplied from WCBS stock productions or supplied by seed companies. The crop will be in the ground for 12 months. Typically planters are 4, 6 or 8 rows. This facilitates seed production with male and female strips.

The typical planting arrangement has a series of 4 row pollinator (male) strips adjacent to 8 to 16 row female strips. Seed harvested from the female is the hybrid seed that eventually will be grown for sugarbeet production and sugar processing. (The slightly lighter green 4 rows of plants in the center of the photo is one pollinator strip.

In the fall, herbicides are applied to control annual weeds. Occasionally insects need to be controlled. Large flotation type tires are used on spraying equipment to facilitate spraying on the wet conditions that often occur. Spraying typically occurs from 5 to 7 times. In the spring, additional spraying for weeds, insects and foliar diseases may be required.

In the spring, the plants begin to grow out of dormancy to produce a seed stalk or bolt. Manipulation (cutting) of some plants may be done to facilitate matching (nicking) of flowering time between the male and female plants.

Transplanting is an option that also may occur in the early spring (Jan to March). Roots may be harvested from other commercial fields or special nurseries planted intentionally for transplanting. Planting can occur under very wet conditions with special transplanting equipment. (Photo shows a strip of pollinator plants that has been transplanted).

By mid June plants have reached full height (5 to 8 feet) with flowers starting to open.

Special machines are used to separate (untangle) the pollinator strips from the female strips. These separators push the branches back to minimize tangling of branches between the strips. The pollen shedding plants (planted in 4 row strips) often are removed as soon as pollination of the female strips is completed.

The female plants have monogerm flowers (produce one germ per seed) which will produce only one plant per seed when planted by the grower. This greatly aids in planting to a final stand or thinning.

Fields are ready to harvest in late July to early August. Swathing of the plants is done with equipment outfitted with both horizontal and vertical cutting bars to minimize dragging of plants which could result in additional seed shattering and loss. Swathers are typically equipped with draper belts. Swathing is done best during periods of high humidity to reduce shattering.

After the seed stalks have dried, a combine with a pickup head is used to separate the seed from the plant material. Combining is a slow process due to the bulky plant material that needs to be processed.

Seed that shatters during the harvest operation may produce volunteers in later years that need to be controlled. Fields are worked and sometimes irrigated shortly after harvest to promote germination of the shattered seed so the volunteers can be reduced.

Sugarbeet seed may be produced in the same field using a rotation of 5 to 8 years. Field run seed is loaded into wooden tote boxes. Boxes are labeled with variety and field information. Seed is moved into warehouses where it awaits cleaning prior to shipping to seed companies.

Seed is run across round-hole screens to remove sticks and other undesirable material. It is then run across a draper (machine with cloth belts) with additional small sticks carried up the inclined belt while the seeds roll down the belt. All seed cleaning equipment must be cleaned between varieties.

Seed is transported to seed companies by shipping in bulk trucks (30 tons), large 1 ton bags or smaller burlap 100 lb. bags.

Seed companies clean, grade, size, treat and prepare the seed for planting.