Soybean Seed Treatment
Soybean Seed Treatment
A lot of growers we work with who are growing corn and using invigor 8™ as a standard seed treatment on their corn, are also growing soybeans. So, the question often comes up, “can I use invigor 8™ on my soybeans as well?” The answer is “yes”, and you will see a positive yield response in your soybeans. However, we’ve found that you will get a higher R.O.I. from using our biological seed treatment RizNate on your soybeans.Nitrogen-Fixation
Soybeans create mutually beneficial relationship with the Bradyrhizobia japonicum bacteria. The B. japonicum which nodulates on soybean roots and fixes nitrogen from the surrounding air. The soybean plants get nitrogen from the bacteria and in return feed the bacteria carbohydrates. Once the nitrogen-fixing bacteria have nodulated onto the soybean plant’s roots, the plant can get up to half to three-quarters of its nitrogen requirements from the air. However, our inoculant takes things a step further.
How Does Our Biological Seed Treatment Work?
Our soybean seed treatment supplies mycorrhizal fungi which can help with nitrogen fixation. This is critical for high soybean yields. For nitrogen fixation to occur, the nitrogen-fixing bacteria known as Bradyrhizobia japonicum must be established in the soil through seed inoculation. Soybean can obtain up to 50 to 75% of its nitrogen requirements from the air when nitrogen-fixing bacteria have established functioning nodules on the roots. The soybean-bacteria symbiosis is mutually beneficial
The soybean plant gets nitrogen from the bacteria, while providing the bacteria with carbohydrates. When soybean seed germinates, the bacteria invade the root hairs of the seedling and begin to multiply. Nodules, which house the bacteria, form on the roots. Under field conditions, the first nodules form within a week after seedling emergence and become visible as they increase in size. Active fixation begins in the V2 to V3 stage, after which the number of nodules and the amount of nitrogen fixed continue to increase. The soybean demand for nitrogen is highest from the R5 to R8 stages.
Should you inoculate?
The decision on whether or not to inoculate depends on whether the field has a recent history of healthy-looking soybean. Most soils in Iowa have a good population of B. japonicum if soybean has been grown in recent years. However, if a field is new to soybean, or has been out of soybean for more than three to five years, it is good insurance to inoculate.
As an example, current recommendations for Iowa are to inoculate the seed if:
1) the field has never been planted in soybeans
2) soybeans have not been grown in the field in the past three to five years
3) the soil pH is below 6.0
4) the soil has a high sand content
5) the field has been flooded for more than a week, creating anaerobic conditions
RizNate is a biological seed and seed trench inoculant specifically designed for soybeans and other legumes. In addition to nodulating bacteria, Riznate’s formula includes free-living nitrogen fixing bacteria and several species of mycorrhizal fungi. RizNate is a biological seed and seed trench inoculant specifically designed for legumes. In addition to nodulating bacteria, Riznate’s formula includes free-living nitrogen fixing bacteria and several species of mycorrhizal fungi.
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