OSU
Extension, Darke County
Drought
Continues to Affect Agriculture in
Western Ohio
By Sam Custer
While
visiting with area farmers and
agriculture businesspersons at the great Darke County Fair this week it
is
clear that we are looking at many surprises this fall.
Reported
silage yields ranged from 7 to 19 tons
per acre ranging from 35% to 90% of normal yields. These
variations in
yields can be found within a couple of miles of each other.
For
those of you who are trying to determine
your possible soybean yield this fall I share with you this piece of
information from OSU Extension.
Soybean
Yield Estimates
With
hot and dry weather conditions, many
growers are curious about soybean yield potential. It is difficult to
accurately predict soybean yield because of plant variability, but
estimates
become more accurate as the growing season progresses. Soybean yield
will be
influenced by rainfall (or lack of rainfall) through August as seeds
are
filling.
To
estimate yield, four soybean yield
components need to be considered: plants per acre, pods per plant,
seeds per
pod, and seeds per pound (seed size). A printable worksheet to estimate
soybean
yield can be found by clicking
here. (http://agcrops-cms.cfaes.ohio-state.edu/links/Estimating%20Soybean%20Yield%20Worksheet.pdf/view)
1.
To calculate plants per acre, count the
number of pod-bearing plants in 1/1,000th of an acre. In
7.5-inch row
spacing, count the number of plants in 70 feet of row. In 15-inch row
spacing,
count the number of plants in 35 feet of row. In 30-inch row spacing,
count the
number of plants in 17.5 feet of row.
2.
To estimate pods per plant, count the number
of pods (containing one or more seeds) from 10 plants selected at
random.
Divide the total number of pods by 10 to get the average number of pods
per
plant.
3.
To estimate the number of seeds per pod,
count the number of seeds from 10 pods selected at random. Generally,
the
number of seeds per pod is 2.5, but this number can be less in
stressful
environmental conditions. Divide the total number of seeds by 10 to get
the
average number of seeds per pod.
4.
To estimate the number of seeds per pound
(seed size), assume that there are 3,000 seeds per pound. If the
soybean plants
experienced stress, seed size will be reduced, and it will take more
seeds to
make one pound. Use a seed size estimate of 3,500 seeds per pound if
smaller
seeds are expected because of late season stress.
Using
the above estimates, the following
formula is used to estimate soybean yield in bushels per acre:bushels
per acre
= [(plants/1,000th acre) x (pods/plant) x (seeds/pod)] ÷
[(seeds/pound) x
0.06]
Contributing
author - Laura
Lindsey
OSU
Extension, engaging people to
strengthen their lives and communities through research-based
educational
programming.
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