by Dr. Charles W. Knight and Robert M. Van Veldhuizen
The average planting time for agronomic crops in Alaska is approximately
the first two weeks of May. Harvest occurs between mid August and late September depending on weather conditions. The frost-free
growing season is between 83 and 100 days during which most crops must mature and ripen. Crops such as barley, wheat, oats,
rye, triticale, buckwheat, canola, flax, sunflowers, safflower, meadowfoam, faba beans and field peas have all been tested
in Alaska, often with limited success due to insufficient information on the climatic, nutrient or cultural requirements of
the crop. The Agricultural and Forestry Experiment Station supports an agronomic breeding and variety evaluation program to
learn about crop requirements and share that information with local producers. The crops listed below summarize present recommendations
and releases as well as some of the more promising new varieties that are the result of ongoing research and testing since
the first agricultural experiment station opened in Sitka in 1898.
Barley
Barley is the most successful cereal crop in Alaska because it
matures and ripens under cool temperatures and short growing seasons. It will ripen 80-100 days after planting. Barley can
have either a winter or spring growth habit and have either 6-row or 2-row spike characteristics. Of these, spring barley
with 6-row spikes matures the earliest. Winter barleys lack hardiness and succumb to winter kill, and 2-row spring varieties
often mature 10 days later than 6-row varieties. Most 2-row barley varieties are classified as malting or pearling varieties
while the 6-row varieties are used for animal feed. Research to date has shown that Alaska-produced malting barleys are good
in such characteristics as kernel weight and plumpness and wort color but they are poor in barley color and soluble and total
protein.
Oats
Oats are second in importance to barley as a cereal crop in Alaska.
Although oats require seven to 10 more days to mature and ripen than barley, they can be harvested green as a forage or hay
crop. Oats are grown primarily for livestock feed. The straw is also in high demand for animal bedding since it does not have
the rough awns (beards) of barley or wheat straw. Three of the best adapted varieties are:
Type
black-hulled
yellow-hulled
yellow-hulled
Harvest
very
early
early
very early
Source
Sweden
USDA*
Alberta, Canada
Yield per season acre (bushels)
111-123
122-134
87-105
* Palmer Research Center, Agricultural and Forestry Experiment Station
Wheat
Three major types of wheat have been grown in Alaska: hard red spring
wheat, winter wheat and durum wheat. Winter wheat varieties frequently have poor winter survival and result in poor yields.
Durum wheat varieties require a longer growing season than exists in Alaska and often fail to mature and ripen. Varieties
of hard red spring wheat (bread wheat) have shown the best adaptation to the Alaska climate. Hard red spring wheat requires
an additional 10-15 days to mature and ripen than barley and is a marginal crop in years with early frosts. The best varieties
grown in Alaska are:
Type
hard red spring
hard red spring
hard red spring
Harvest
early
early
early
Source
Siberia
USDA*
USDA*
Yield per season acre
(bushels)
46-73
38-55
44-61
* Palmer Research Center, Agricultural and Forestry Experiment Station
Rye
Rye is a late maturing crop in Alaska and requires 7-10 days more
to mature and ripen than wheat. For this reason it is more marginal than wheat. There are two types, spring and winter rye.
Winter rye is susceptible to snow mold damage and few seedlings survive the winter. However, one variety, 'Saskatoon', will
have enough survivors to equal the yield of 'Gazelle' spring rye. Both of these varieties are susceptible to a disease called
ergot. This is a very conspicuous, blue-black, hard fungal mass that develops in place of the kernel. The ergot sclerotia
contains several chemical compounds, most of which are harmful to humans and animals. Average yield per acre for rye is 41-65
bushels.
Triticale
Triticale is a hybrid between wheat and rye which combines the
hardiness of rye with the high bread-making quality of wheat. It also possesses the late-maturing qualities of both parents
making it another marginal crop for Alaska. Like rye, it is susceptible to ergot. Average yield per acre is 30-80 bushels.
Canola
Canola is a high quality edible oilseed crop containing 43% oil
and 57% meal for animal feed. There are two types of canola, Argentine and Polish. Argentine canola varieties have large,
black seeds and are often late maturing. Polish canola varieties have small yellow seeds and are early maturing. Unlike other
members of the Brassica species, canola is not affected by the long daylength of Alaska summers, thus it flowers abundantly
and produces seed. The main problem experienced in Alaska has been uneven ripening of the seeds resulting in a high percentage
of green seeds at harvest. These green seeds add an unacceptable green tint to the processed oil. The primary goal of current
research is to reduce this percentage of green seeds. The most popular variety for Alaska at this time is 'Tobin', an early
maturing Polish type developed in Canada. Yield averages 25-35 bushels per acre. Argentine canolas like 'Legend' will yield
about the same but have a much high percentage of green seed.
Other Crops
Buckwheat is used for flour even though it is not a small
grain like wheat. It is an indeterminate plant which means that it will flower and produce seed all season long. Timing of
the harvest is critical because the plant will lodge (fall to the ground) severely if hit by frost, making it nearly impossible
to mechanically harvest. In addition, the seed must be dehulled before the flour can be obtained. Because of all these factors,
buckwheat is a marginal crop for Alaska. Average yield is highly variable ranging from eight to 100 bushels per acre.
Sunflowers are classified as confectionery or oilseed. Both types have been
grown in Alaska with varying success. Traditional, tall sunflowers will mature and ripen in Alaska, and the newer dwarf sunflower
(sunwheat) is even earlier. However, sunflowers heads turn downward when mature, creating a bowl-like depression. The late
fall rains common in Interior Alaska will collect in these depressions, keeping the heads moist to a point where they cannot
be mechanically harvested. Attempts to leave the sunflowers in the field until after the first snowfall to freeze dry are
negated by the local bird populations which can consume more than 50 percent of the crop. Average yield is 90 to 126 bushels
per acre.
Flax is classified as fiber or oilseed. The fiber flax is usually taller
and yields higher biomass than the oilseed varieties, however both types can be used for fiber or oil. Linen is produced from
fiber flax and linseed oil from oilseed flax. Oilseed flax such as 'Norlin' require a long growing season but can reach maturity
in good years. It is often slow to emerge and has too much green matter at harvest. This makes it difficult to mechanically
harvest and dry prior to storage or processing. Average yield is 10 to 15 bushels per acre.
Field peas are a cool season, early maturing crop that grows well as a forage
crop, often interseeded with oats. When grown by themselves the short, leafless varieties are the best. Taller or heavier
varieties will lodge, making it difficult to harvest mechanically. Like sunflowers, field peas can be totally decimated by
migratory waterfowl in the fall. Average annual yield is 10-60 bushels per acre.
Canarygrass is a crop grown specifically for bird food. It requires similar
soil, climatic and nutrient characteristics as the small grains and produces seed similar in size and shape to flax. 'Elias'
is a typical variety that grows well in Alaska. It will yield on average 10-15 bushels per acre.
