|
How to Estimate Plant Population (Corn)
|
Harvest Population |
|
Planting Rate |
Inches between seed when
planting at these row widths |
|
20" |
30" |
36" |
38" |
40" |
|
18,000 |
Requires |
20,222 |
15.6 |
10.5 |
8.7 |
8.3 |
7.8 |
|
19,000 |
Requires |
21,100 |
14.8 |
9.9 |
8.3 |
7.8 |
7.4 |
|
20,000 |
Requires |
22,200 |
14.2 |
9.4 |
7.9 |
7.4 |
7.1 |
|
22,000 |
Requires |
24,400 |
12.8 |
8.6 |
7.1 |
6.8 |
6.4 |
|
24,000 |
Requires |
26,700 |
11.8 |
7.8 |
6.5 |
6.2 |
5.9 |
|
26,000 |
Requires |
28,900 |
10.8 |
7.2 |
6.0 |
5.7 |
5.4 |
|
28,000 |
Requires |
31,100 |
10.0 |
6.7 |
5.6 |
5.3 |
5.0 |
|
30,000 |
Requires |
33,300 |
9.4 |
6.3 |
5.2 |
5.0 |
4.7 |
|
32,000 |
Requires |
35,600 |
8.8 |
5.9 |
4.9 |
4.6 |
4.4 |
|
34,000 |
Requires |
37,800 |
8.4 |
5.5 |
4.6 |
4.4 |
4.2 |
Based in 10%
stand loss by harvest.
For plants, measure the distance in
inches between 11 plants and divide by
10.
How to Estimate Plant Population Per
Acre (Corn)
Count the number of stalks in a length
of row equal to 1/1000 of an acre. Make
several counts in separate sections of
the cornfield, figure the average of
these samples, then multiply this number
by one thousand.
|
Row Width |
Row Length
Equal to 1/1000 Acre |
|
20" |
26.2 ft. |
|
30" |
17.4 ft. |
|
36" |
14.5 ft. |
|
38" |
13.8 ft. |
|
40" |
13.1 ft. |
Planting Depth
Put the kernel deep enough to be in
moist ground and no deeper. Seed corn
will need to be planted deeper in sandy
soils that in heavy clay soils.
Experiments have shown that where
moisture is adequate, the depth of
planting has no effect on the depth of
the permanent root system.
Normally 1 to 1˝
inches is the recommended planting
depth.
Essential Requirements for Producing
High Yields of Corn
To obtain and maintain good yields of
corn we must add and/or replace at least
part of the soil nutrients required and
removed by the crop. Fertility reserves
in the soil can provide part of the
needs of the growing crop. Additional
nutrients must be added to maintain the
soil fertility and produce top yields of
corn. The chart below indicates the
total amounts of Nitrogen. Phosphorous
and Potash required for various yield
levels. To know what levels exist in
your soil and accurately determine the
amount you need to apply, soil samples
and tests should be taken every 1 to 2
years. Proper pH (acidity) levels must
be maintained for optimum nutrient
uptake by the plant. A pH level of 6.5
is generally considered best for corn.
|
Yields of Shelled Corn |
Inches between seed when
planting at these row widths |
|
Nitrogen |
Phosphorus |
Potash |
|
150 Bu. |
225 |
90 |
180 |
|
175 Bu. |
262 |
105 |
210 |
|
200 Bu. |
300 |
120 |
240 |
|
250 Bu. |
375 |
150 |
300 |
|
300 Bu. |
450 |
180 |
360 |
Other Important Practices for Maximum
Corn Yields
-
Plant early at optimum populations.
-
Plant shallow but so seed is in
moist soil.
-
Control weeds and insects.
-
Supply minor elements if needed.
-
Plant all recommended Ruff's
hybrids.
-
Harvest early.
-
Store properly.
Estimating Yields of Corn
Using the chart below, measure the
length of row to equal 1/1000 of an
acre. Pick and shell all of the ears in
the measured distance. Weight the
shelled corn, test it for moisture and
correct the weight to 15.5% moisture.
Multiply this weight by 1000 and divide
by 56 to give estimated bushels per
acre. Example: 10 pounds of shelled corn
at 25.5% moisture corrected to:
15.5% = 8.8
pounds x 1000 = 8800
÷ 56 = 157 bushels of corn per acre.
To obtain a more accurate yield
estimate, sample should be taken from at
least 5 representative locations in the
field and the results averaged.
Length of row to equal 1/1000 acre
|
Row Width |
Row Length |
|
40" |
13' 1" |
|
38" |
13' 9" |
|
36" |
14' 6" |
|
34" |
15' 5" |
|
30" |
17' 4" |
|
20" |
26' 2" |
|
