|
Soybean Replant Calculator
Details about this form can be found at the bottom of the page.
| Yield
effects from reduced plant population, uniform stands and weed free
conditions |
|
Population
plants/acre
|
Yield
as % of normal
|
|
Solid
Seed
|
30
in. row
|
|
160,000
|
100
|
100
|
|
120,000
|
100
|
100
|
|
80,000
|
96
|
100
|
|
60,000
|
92
|
94
|
|
40,000
|
87
|
88
|
|
20,000
|
77
|
81
|
|
10,000
|
58
|
72
|
|
| Figure 1 |
Source: 1994 Corn &
Soybean Field Guide |
|
Indiana
- Yield effect from delayed planting
|
| Planting
date |
Yield
as % of normal
|
| mid-season
variety |
full-season
variety |
| 20-May |
100 |
100 |
| 30-May |
96 |
94 |
| 10-Jun |
92 |
90 |
| 20-Jun |
82 |
78 |
| 30-Jun |
70 |
NR* |
| 10-Jul |
60 ** |
NR* |
|
| * NR - not recommended |
| ** In Indiana, south
of I-70 only |
| Figure 2 |
Source: 1994 Corn &
Soybean Field Guide Purdue University |
| MN - Yield
effect from delayed planting |
|
Planting
date
|
Yield
as % of normal
|
|
Late
April - Early May
|
0
|
|
Mid-May
|
90
|
|
Early
June
|
80
|
|
Late
June
|
60
|
|
| Figure 3 |
Source:
1994 Soybean Growth and Development & Management Information for Replant
Decisions
Minnesota Extension Service |
Hints or Explanation for Each
Question
Base yield for field = Expected
average yield for field
Est. of yield as % of normal = % of normal yield based off population
of plants per acre from reduced stands (fig. 1)
Market Price ($/bu) = Expected market price
Weed control cost for poor stand = Cost of herbicide & application to
control weeds
Est. of yield as a % of normal = effects on yield due to planting dates
from delayed planting (fig. 2 or fig. 3)
Cost of replanting ($/ac) = Cost of replanting per acre (tillage, seed,
herbicide, labor)
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