The above field of soybeans was planted this spring without inoculant.It has never been planted to soybeans before.As you can see without Rhizobium inoculant to help nodulate the roots the crop is yellow from a lack of Nitrogen production.Once the crop reaches the R3 stage it is best to apply 50 lbs of supplemental N prior to a rainfall event.This can add a nice yield boost.
The above photo shows the crops roots with no nodules evident.
The above photo shows an adjoining field of soybeans that was also planted this spring without inoculant.This field was planted to soybeans once before in the previous 10 years.It would appear that the inoculum from that one preceding bean crop has been enough to nodulate this crops roots.As you can see the crop looks dark green and appears as if it is producing adequate N.
The shot above shows how well the roots of the above crop have been nodulated.When planting Virgin soybean ground for the first time bombard the soil with high rates of inoculum.It is best to double treat seed with two different sterile inoculants that both contain Race 532C.A nice yield advanatge can be achieved by doing so.Growers farming coarse sandy soils or soils with pH's below 6.0 are best advised to inoculate their soybean crops every year to optimize yields.
Wednesday, July 29, 2009
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