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Interpretive Summaries:
2005 - Assessment of Soybean Response to Boron Fertilization in Growers’ Fields
2004 - Assessment of soybean response to boron fertilization in grower's fields
Assessment of Soybean Response to Boron Fertilization in Growers’ Field, 2005
On-going efforts are aimed at finding the most efficient timing, rate, and boron (B) application method to prevent and/or reduce potential yield limiting effects of B deficiency. Although the documented B-deficient symptoms have not been associated with a particular maturity group or soybean variety, the varietal response to B applications is a subject of interest. For the 2005 season, the cultivars Asgrow 5301, DP 5414, Progeny 5250, Armor 47G7, and Pioneer 94M80 were selected to represent different breeding programs. Plant analyses showed tissue B levels at the V4 growth stage were significantly different among cultivars, and were in the deficient range when compared to commonly used sufficiency levels for soybeans at the R1 growth stage. Levels of nitrogen (N), phosphorus (P), and potassium (K) did not show the same variability. Tissue B levels collected 1.5 weeks after R1 foliar-B application showed an increasing trend as B rates increased, but erratic rainfall patterns experienced during the 2005 season may have contributed to the abnormally high tissue B levels observed. There were no significant effects of B rate or timing on soybean yields in 2005. AR-26F
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