Some producers across the state are in the middle of harvest while others have sent the last grain truck to the elevator and are getting geared up for seeding. An important question to ask your self is this: can I set the notches on the drill to a seed index of 45 and not look back? Even with a new drill, the answer should be “No”. Everyone has their preferred seed drill whether it is an old John Deere HZ drill or one of the new air seeders. No matter the type of seed drill used, one should always calibrate to ensure proper seeding rates. If too much seed is going out, one could be wasting dollars. Also, your yields will likely suffer if plants are competing against each other, so, after you have chosen your variety, make sure to calibrate your drill. If you plant too little seed, your fields won’t produce to its full potential. You’ll have more weed pressure and disappointing yields. Because drills meter by volume and seed is planted by weight, the only way to be sure you’re seeding at the right rate is to calibrate your drill.
Make sure to check out our Seeding Rate Converter that can help with the calibration process.
The YouTube video titled “Seed Drill Calibration” demonstrates a step-by-step process for calibrating a seed drill.
Here is a PDF titled “Ready. Set. Seed” was presented at the 2014 Direct and Oilseed Cropping Systems Conference in regards to planting canola.
For questions or comments, contact Dale Whaley by phone at (509) 745-8531 or by email at email@example.com.
WSU Small Grain’s Cereal Variety Testing Program field days are well underway. Recently, Ryan Higginbotham, Regional Extension Specialist for the Cereal Variety Testing program at WSU, and Michael Pumphrey, Endowed Chair and WSU Spring Wheat Breeder, were interviewed by Scott Yates, Director of Communications at the Washington Grain Commission at the Reardan Field Day, which was held June 28.
In episode 29 of the Wheat All About It! podcast, Plotting Wheat’s Way Forward, Higginbotham and Pumphrey discuss field day preparation and this summer’s weather as it relates to the possibility of incurring late maturity alpha amylase activity and falling numbers discounts.
Don’t forget to subscribe to all of the Wheat All About It! podcasts on iTunes. Search for Wheat All About It. A summary of the podcasts, including many highlighting WSU researchers is available at the Washington Grain Commission website.
In 2015, WSU released a new soft white winter wheat cultivar named Jasper, which was the 100th cultivar released from the University. Unfortunately, in the 2016 WSU Variety Testing trial, Jasper was not included due to a seed error in transferring the seed from the breeding program to the variety testing program.
As a result, many growers have asked for yield information on this line from the test plots in the breeding program, where the correct seed was planted. Tables are provided to help summarize the performance of Jasper as compared to other cultivars released from the breeding program. These lines are also included as check cultivars in my yield trials, and thus provide easy yield comparison.
Table 1 provides information on heading date (HD; days after January 1st to heading) and plant height (PH; measured in inches). The yield data encompasses all paired location data we have on Jasper across 74 locations and seven years. Yield of Jasper is significantly higher than all other cultivars when averaged over these locations.
Table 2 provides the data just in locations receiving less than 16” of annual rainfall. Here there are 49 paired observations for yield comparison. Jasper again demonstrated higher yield potential than check cultivars. Data is also presented in Table 2 representing specific locations where we have multiple observations of Jasper across years. Again, yield potential is higher than check cultivars with the exception of Lind.
|Davenport (4)||Harrington (5)||Lind (12)||Ritzville (5)||Breeding Trial Average (49)||Variety Testing Average (34)|
When data is averaged from the <16” WSU Variety Testing trials where Jasper was present (2013-2015, 34 observations), Jasper had a significantly higher yield potential than all checks except Xerpha, which showed no significant difference. In 2016, Jasper was also on two large scale plantings. In Ritzville, a large strip trial had Jasper averaging 77 bushels per acre (bu/a), the highest yield of all entries. Xerpha yielded 61 bu/a, whereas Puma and Otto both yielded 74 bu/a. At the Wilke Farm in Davenport, Aaron Esser had a field of Jasper and a field of an Otto/Masami blend. Jasper averaged 99 bu/a, whereas the Otto/Masami blend averaged 91 bu/a.
Average grain yield in bushels per acre over all paired locations in WSU Winter Wheat Breeding Trials in areas with less than 15” annual rainfall. Variety Testing data is also included, averaging yield data from 2013-2015 in less than 16” rainfall zones. Individual locations are also presented along with the number of observations analyzed.
For questions, contact Arron Carter at firstname.lastname@example.org or (509) 335-6198.
Low Falling Numbers has been a big issue for eastern Washington wheat growers this season. Discounts for grain with falling numbers below 300 are causing serious financial losses for some growers. Falling numbers testing of the Washington State University Cereal Variety Trials are currently underway. Based on variety trial information, the low falling number problem is far more extensive this year than in 2013. In 2013, there were major problems with low falling numbers in seven of 20 variety trial locations.
Thus far in 2016, we are seeing low falling numbers problems in 11 or the 14 locations tested thus far. Of these 11 low falling number locations, four are showing falling numbers below 200 seconds. In order to help growers understand what the Hagberg-Perten Falling Number test is and how to manage the risk of low falling numbers for the future, Camille Steber, Research Molecular Geneticist with the USDA-ARS, authored Managing the Risk of Low Falling Numbers in Wheat, a new WSU Extension publication.
For questions or comments, contact Camille Steber at email@example.com or 509-335-2887.
As wheat harvest gets started in Washington, recent rainfall and cool temperatures have some growers worried about Mother Nature’s fickle ways with their crop. Rainfall close to harvest can result in preharvest sprouting, which can negatively affect wheat quality. Dr. Camille Steber, USDA-ARS plant geneticist, explains the potential effects of recent rains on this year’s wheat crop and what growers can do to manage this risk.
The Hagberg-Perten Falling Number test is used to measure starch damage due to sprout. Low FN is used as an indicator that grain contains a high level of alpha-amylase, an enzyme that degrades starch leading to poor end-use quality of wheat products (Figure 1). Grain with an FN below 300 seconds is typically discounted in the Pacific Northwest.
Wheat that has been rained on is at risk of low FN. Eastern Washington experienced periods of rainfall July 7 to 12, 2016, just as winter wheat harvest approached. Chances are, buyers will check FN to protect themselves from sprout damage risk. Whether or not your grain is likely to have low FN problems depends on the susceptibility of the cultivar you grew, on the local weather, and the timing of the rain relative to maturity date.
Preharvest sprouting is the initiation of grain germination while still on the mother plant. Germinating seeds degrade starch for use in fueling growth. Lack of seed dormancy explains 60-80% of genetic sprout susceptibility. Dormant grains can’t germinate, and so don’t suffer sprout damage in the rain. Seed dormancy is strongest at maturity, just as the wheat turns from green to yellow. Dormancy is lost gradually over time as the dry, mature grain “after-ripens” (Figure 2). Winter wheat that still had some green color is less likely to have a low FN due to sprouting than wheat that was completely yellow and dry when it rained. Since green grain cannot sprout, spring wheat that was green when it rained should be safe from low FN, as long as there isn’t another ill-timed rain event.
Not all rainstorms induce sprouting. Seed dormancy is broken by cool, rainy conditions. So if the temperatures are in the 80s °F when it rains, the wheat is less likely to sprout than if the temperatures are in the 60s. Low FN is also more likely when there are multiple rainy days in a row, as the wheat stays wet longer.
How do you spot sprouted grain?
It takes a lot of rainfall to make a seedling sprout out from a wheat spike (about 3 days of constant rain at 70 degrees). If you look closely at a mildly sprouted grain, you can sometimes see a small root protruding from the germ-end (Figure 3). Such grain can have a very low FN (under 200 sec). As the sprouted grain dries, the root can shrink back into the grain leaving behind a small crack at the embryo end. Sometimes this cracked end breaks, leaving behind a germ-less grain. So get out your magnifying glass.
Low FN (200-300 sec) can also be caused by late-maturity alpha-amylase (LMA) induced by heat shock or cold shock during grain maturation. LMA causes low FN in grain that appears to be sound. We had some big temperature fluctuations this summer, so there may be some lower FN in wheat that saw no rain. Some LMA-susceptible suspects include SY-Ovation, Bruehl, Jasper, and Alturas.
Plant cultivars with genetic resistance to sprouting and LMA. We can use past preharvest sprouting events to judge which cultivars have more genetic resistance to sprouting. For example, there were major sprouting events in Fairfield, Lamont, Pullman, and other locations in 2013. The FN of all cultivars grown in the WSU Cereal Variety Trial at all locations in 2013 and 2014 can be found on the Project 7599 PNW Falling Number website. One problem is that many of the highly PHS tolerant cultivars such as Mary and Masami are older cultivars that may not compare well to recent cultivars for yield and disease resistance. The falling number versus yield tool on the Project 7599 website can help you take both yield and FN into account when choosing a cultivar (http://steberlab.org/project7599data.php#anchor2013Results). Examples of sprouting-resistant cultivars include Puma, Skiles, Coda, and Bobtail. Sprouting-susceptible cultivars include Bruehl, Xerpha, AP-Legacy, LWW10-1018, and Bruneau. Ongoing research will improve sprouting resistant choices.
Harvest wheat quickly after maturity to reduce risk of getting rained on. Wait for the rained-on wheat to dry well before harvesting to avoid germination in the truck. Also, avoid harvesting green wheat, as green kernels have higher alpha-amylase (lower FN) than mature grain. Green kernels can be a problem if you combine wheat that is yellow on the hill with green wheat from the draw.
Avoid mixing likely-sprouted grain with likely-unsprouted grain. A little bit of alpha-amylase can cause big FN problems. Mixing equal amounts of FN 200 grain with FN 400 grain will not give you a load at FN 300 sec. Instead you will end up with something well below 300. If you have one field that was greenish and another field that was fully yellow when it rained, you might make more money if you keep them separated when you sell. The same is true if you planted both a sprouting-resistant and susceptible cultivar in separate fields.
Store mildly sprouted grain. Some research suggests that alpha-amylase levels drop during storage – it could be that UV light or heat degrades the enzyme over time. If the FN is moderately low (200-300 sec), it might help to store grain for 2 to 3 months to see if the FN rises. If the FN is very low, storing the grain won’t reverse starch damage that has already occurred. So storing the grain may not greatly improve its value.
If you want to read more about the Falling Number test and sprout damage, see:
“Preventing those Falling Numbers Blues” – Wheat Life (http://steberlab.org/pubs/2013c.pdf)
“Falling Numbers: research strategies to stay out of the red.” – Wheat Life (http://steberlab.org/pubs/2014d.pdf)
2013 and 2014 Falling Number Data (http://steberlab.org/project7599data.php#anchor2014Results)
Camille Steber is a molecular geneticist with the USDA-ARS in Pullman, WA. For questions/comments, contact her at firstname.lastname@example.org or 509-335-2887.