Farmer-Saved Wheat Seed in Oklahoma: Questions and Answers
- Jump To:
- What is the difference between farmer saved seed and certified seed?
- Am I allowed to save seed from PVPA protected varieties?
- Will I suffer a yield decrease when planting saved seed?
- What is Quality Seed?
- How do I manage for quality seed?
- Can I apply seed treatments to my saved seed?
- Does the purity of a variety run out over time?
- Does weed seed really matter that much?
- What are the savings associated with farmer-saved seed?
What is the difference between farmer saved seed and certified seed?
Certified wheat seed has gone through a certification process overseen by a state agency such as the Oklahoma Crop Improvement Association. In this process, a grower wishing to produce and sell certified seed purchases seed of known variety and purity from the Oklahoma Foundation Seed Stocks. The growing crop is then monitored by Oklahoma Crop Improvement Association (OCIA) staff for contamination by weeds, disease, and other varieties. After the crop is harvested, samples are sent to the OCIA for purity and germination analysis to determine if the seed meets OCIA standards. In summary, the certification process is a system of checks that ensures seed sold as a certified class is of high quality and suitable for sowing by the purchaser.
Farmer-saved seed can be divided into two classes: bin-run seed that has not been cleaned; and custom-cleaned seed that has been processed by a local seed cleaner (in some cases, the producer). Bin-run seed is frequently contaminated by weed seed and inert matter and often has low germinability and vigor. This can result in poor emergence, reduced forage production, and low grain yield. The quality of custom-cleaned seed in relation to certified seed depends on the quality of seed prior to cleaning and the efficiency of the cleaning process at removing small and/or light seeds. In summary, the quality of farmer-saved seed is only as good as the quality-control measure used in seed production and the cleaning process used post-production. It may be very high quality or very poor quality.
Certified seed is produced under strict quality control guidelines to ensure seed meets minimum quality standards.
Am I allowed to save seed from PVPA protected varieties?
Yes. Wheat varieties protected under the 1994 Plant Variety Protection Act (PVPA) can only be sold as a class of certified seed. A grower may, however, save seed from these varieties to plant on his/her own holdings (land owned, leased, or rented). The exceptions to this rule are Clearfield® wheat varieties that have patented genetic material that confers resistance to the Clearfield® herbicide system. Since these varieties contain a patented gene, they cannot be saved by the farmer, even for use on his/her farm.
Will I suffer a yield decrease when planting saved seed?
One can find literature to support either side of this argument, but most research supports the idea that whether or not a yield penalty is associated with farmer-saved seed depends almost exclusively on the seed production and storage practices of the individual producer. A three-year experiment evaluating the performance of farmer-saved wheat seed in Oklahoma revealed the majority of farmer-saved seed samples performed comparably to their certified counterparts in terms of grain yield and forage production (Figure 1). Grain yield disadvantages of 15 percent and forage yield disadvantages of 27 percent, however, were observed for some of the poorest quality samples. Weed seed were removed from the farmer-saved wheat samples, so these results do not account for any yield disadvantages that might have occurred due to weed interference associated with weed-infested samples.
Figure 1. Percentage of farmer-saved wheat samples producing grain yield less than certified samples of the same variety at least one test site. A total of 19 farmer-saved samples were tested at four locations in 2003, 27 farmer-saved samples were tested at three locations in 2004, and 17 farmer-saved samples were tested at two locations in 2005.
What is Quality Seed?
Several factors influence the quality of wheat seed for planting, but paramount among these are:
- Free of weed seed
- High germination percentage
- High vigor
- Free of foreign material
- Free from small and/or shriveled kernels
How do I manage for quality seed?
The easiest way to ensure good seed quality for planting is to purchase certified seed from a supplier with a good reputation and history of quality seed. There are, however, some guidelines that can be followed to ensure that farmers wishing to save their own seed are successful in this endeavor. Among these are:
- Sow enough certified seed each year to provide seed for sowing the following year. This ensures varietal purity and provides access to new varieties.
- Only save seed from weed-free fields and clean all harvest equipment thoroughly before entering seed wheat fields.
- Apply a fungicide and don’t save seed from fields infested with loose smut or common bunt.
- Store seed in a low-moisture environment and protect from insects.
- Always perform a germination test and seed count (seeds per pound) prior to sowing and adjust seeding rates accordingly.
- Apply a fungicide or insecticide seed treatment to aid with seedling establishment and survival.
Can I apply seed treatments to my saved seed?
Many seed cleaners are equipped to apply fungicide or insecticide seed treatments, but one can apply his/her own seed treatment as long as thorough coverage of the seed is obtained. To assist with this task, there are auger-mounted seed treaters available that can apply a treatment to the seed as it is augered into the drill. Finally, read and follow labels carefully as there are many different formulations of seed treatments. Some require dilution with water and some do not. Know which system works best for you and how to calculate the cost per unit of active ingredient to accurately compare prices among products.
Does the purity of a variety run out over time?
This is a common myth regarding wheat seed, but it is one that can easily be busted. Quite simply, any “off types” present in seed of modern cultivars are the result of mixing and poor seed handling procedures. This is a wide-spread problem, which adds to the confusion about seed purity. In a three-year experiment at Oklahoma State University evaluating farmer-saved seed, it was common for farmer-submitted samples to contain greater than 10 percent of other varieties and a few samples were completely misidentified. To avoid varietal mixing and misidentification, keep complete records, clean equipment thoroughly between fields, have seed cleaned by a reputable processor, and sow certified seed each year to save seed for the following year.
Does weed seed really matter that much?
Unless you are producing wheat exclusively for forage, the answer is a resounding yes! Italian ryegrass infestations as low as two plants per square foot can reduce wheat grain yield by as much as 38 percent (Appleby and Brewster, 1992) and cheat infestations of 177 seed per square foot can reduce wheat grain yield by 35 percent (Koscelny et al., 1990). In addition to direct reductions in yield, increased weed infestation results in higher weed control costs to the farmer. Therefore, any added weed control costs or yield reductions from weed interference would need to be included in the cost of farmer-saved seed.
Contamination with weed seed can lead to a long-term, costly weed infestation. Several of the weed problems, such as feral rye, that can be introduced via poor quality seed are nearly impossible to control without the aid of crop rotation.
What are the savings associated with farmer-saved seed?
Like most economic examples, the cost comparison of farmer-saved and certified seed sources will be farm-specific. The easiest way to compare the costs of the two, however, would be to create a partial budget that accurately accounts for the full cost of farmer-saved seed (Table 1). Naturally, costs vary from farm to farm and not all farmers will experience all of these expenses when saving their own seed, but it is also important to realize that the cost of farmer-saved wheat seed is not simply the production cost or the market price of wheat.
|Factors to consider||Your Costs|
|Wheat market price per bushel||$ _____________|
|Seed cleaning charges||$ _____________|
|Value of seed removed during cleaning||$ _____________|
|Seed treatment costs||$ _____________|
|Storage costs||$ _____________|
|Interest cost||$ _____________|
|Added weed control costs||$ _____________|
|Farmer-saved seed total cost||$ _____________|
Appleby, A. P. and B. D. Brewster. 1992. Seeding arrangement on winter wheat (Triticum aestivum) grain yield and interaction with Italian ryegrass (Lolium multiflorum). Weed Tech. 6, 820-823. 1992.
Koscelny, J. A., T. F. Peeper, J. Solie, and S. G. Solomon, Jr. 1990. Effect of wheat (Triticum aestivum) row spacing, seeding rate, and cultivar on yield loss from cheat (Bromus secalinus). Weed Tech. 4, 487-492.
Small Grains Extension Specialist