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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' Fields, 2004
Yield-limiting boron (B) deficiency symptoms were documented in several soybean producing regions of Arkansas during the 2001 season. The objective of this study was to assess the yield response of popular soybean varieties (maturity group V) to 0, 1, and 2 lb/A of soil-applied B, and to foliar-applied rates equivalent to 0, 0.5, and 1 lb B/A at vegetative (V4) and reproductive (R1) growth stages. The test was located in a grower’s field where a B deficiency was documented in 2002. An additional test was established in a grower’s field with no previous history of deficiency symptoms. This test consisted of a single application of B at a rate equivalent to 1 lb B/A at the R1 growth stage. At the deficient site, initial soil samples (Mehlich 3 analysis) showed average B levels of 0.4 parts per million. Boron levels in leaf tissue collected at R1 showed increased B with increased rates of application, but no yield effects from the soil-applied rate and timing combinations. The response to foliar-applied B appeared to vary according to soybean variety, and was more obvious with B applications at the V4 stage, as compared to applications at the R1 stage. AR-26F
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