WSMB Continues Enhanced Nematode Testing Program for 2014
Figure 1. WI Counties Confirmed to Have SCN as of 2013. |
(freescntest@mailplus.wisc.edu).
Figure 1. WI Counties Confirmed to Have SCN as of 2013. |
The 1st place winner in Division 4, Dean Booth of Cuba City, grew Asgrow AG2431 and harvested 82.7 bu/a. In second place, Mary Kay Booth of Cuba City grew Asgrow AG2433 and harvested 81.8 bu/a. In Division 3, RnK DeVoe Farms of Monroe won 1stplace with Pioneer P28T33R at 92.1 bu/a (highest overall yield) and in 2ndplace, Ellis Farms Inc. of Walworth harvested 74.4 bu/a with Dairyland DSR-2190/R2Y. Also in Division 3, the Wisconsin Bean Team of UW Graduate students Adam Gaspar, David Marburger, and Ethan Smidt grew Pioneer P28T33R and harvested 87.4 bu/a. The WI Bean Team is ineligible for official prizes as they are grad students of Dr. Conley; however their efforts are still recognized. In Division 2, Stetzer Brothers LLC of Melrose achieved 71.2 bu/a from Pioneer 91Y90 for first place. In 2ndplace, Triple Maple Dairy LLC of Manitowoc harvested 65.0 bu/a from Renk RS183NR2 soybeans. In Division 1 at 57.8 bu/a was Paul Graf Farms LLC from Sturgeon Bay. They planted Pioneer 90Y90. 2nd place winner in Division 1 was Kloos Acres from Stratford. They harvested 55.0 bu/a from Pioneer 91Y30.
Agronomic Practices of 2013 WI Soybean Yield Contest Winners
Avg. Planting date | May 14th |
Avg. Seeding rate (seeds/acre) | 176,111 |
% using this practice | |
Inoculant | 33 |
Seed fungicide | 67 |
Seed insecticide | 56 |
Foliar fungicide | 56 |
Foliar insecticide | 22 |
Row spacing < 30″ | 89 |
Conventional tillage | 56 |
Previous crop not corn | 11 |
Division 4:
Division 2:
The contest is sponsored by the WI Soybean Program and organized to encourage the development of new and innovative management practices and to show the importance of using sound cultural practices in WI soybean production.
Article from:
Article from:
4. The last consideration I would bring forward is that the mature areas are likely going to be the low yielding pockets due to drought whereas the yet to mature areas will likely be the higher yielding areas within the field. So, in short, which yield envirnoment would you rather focus your time and efforts to protect?
Dry soil conditions have sparked many questions from growers on how best to establish their winter wheat crop. As we were reminded last year and this there is no substitute for rain (unless you have irrigation), however here are a few ideas to consider to mitigate your risk.
Table 1. Planting date effect on grain yield and winter survival at Lancaster and Arlington WI, 2009. | ||
Lancaster, WI | ||
Planting date | Grain yield (bu/a) | Winter survival (%) |
17-Sep | 74.9 | 88.5 |
30-Sep | 68.3 | 70.0 |
13-Oct | 54.2 | 58.0 |
Arlington, WI | ||
Planting date | Grain yield (bu/a) | Winter survival (%) |
18-Sep | 101.9 | 83.8 |
1-Oct | 93.3 | 55.3 |
17-Oct | 73.9 | 30. |
The Wisconsin soybean crop is slowly starting to mature, however many growers and crop consultants are still concerned about the risk of frost damage to late planted fields. In soybean an extended period (several hours) of temperatures 28 degrees F or lower is required to completely kill a soybean plant, though temperatures 32 degrees or less can still damage top growth. Those growers considering the state of their soybean crop and wondering the odds of making it to maturity before significant yield loss occurs must first correctly identify the soybean growth stage.
Once the crop growth stage has been determined we can estimate the number of days it will take for your field to reach R7 or physiological maturity. Across our Arlington and Hancock field sites it has taken 5-8 days to go from R3 to R4, 7-8 days to go from R4 to R5, 10-14 days from R5 to R6 and 14 days from R6 to R7. Note: we have seen crop development expedited the past few weeks due to heat and drought conditions. Next using the three figures below that show the 10th percentile, median, and 90th percentile date when you can expect a freeze event you can estimate the risk of a frost based on your crop growth stage.
For example: If you lived in SW Marathon county there is a 10% chance that a freeze event would have occurred prior to September 11-20, a 50/50 chance that a freeze event would occur prior to September 21-30, and a 90% chance a freeze event would have occurred prior to October 1-10. So if your soybean crop just entered the R5 crop growth stage today 9/7/13 there is a greater than a 50/50 chance that crop won’t make grain based on historical weather data.
Lastly if you are concerned about a freeze event please refer to Table 1 below that provides yield loss estimates of freeze damage by crop crop stage. This may help you decide whether you should risk taking the late planted soybean field as a grain crop or would that field be more valuable as a forage or green manure?
Table 1. Soybean Response to Freeze Damage
|
|
Growth Stage
|
Yield Reduction
|
R4 – Full pod
|
70%-80%
|
R5 – Beginning seed
|
50%-70%
|
R6 – Full seed
|
15%-30%
|
R7 – Beginning maturity
|
0%-5%
|
R8 – Full maturity
|
0%
|
Source: Saliba et. at. Kansas State University, 1982
Now that we have checked the label and determined we can legally harvest our soybean crop as a forage now lets consider the calendar for our full suite of options. The average number of days it will take from R6 (full seed) to R7 (beginning maturity) soybean is 15-18 days. If you are in R6 now look at your historic killing frost date and extended weather forecast. If the odds are in your favor roll the dice and cut the beans for grain. If you are not at R6 yet or there is a strong chance of a killing frost in your extended forecast prior to R7 lets realistically consider our options for best utilizing this standing soybean crop.
Option # 1: Soybean haylage considerations
Option #2: Green manure considerations
Neither of these prove to be particularly attractive options. However I would encourage growers, crop consultants, and nutritionists to weigh the true economical value of each option carefully before proceeding.