Boron (B) is an essential micronutrient needed for normal plant growth and development. To evaluate the response of corn to foliar B applications at V4–V6 (4–6 leaves with visible collars) and VT (tasseling) growth stages on fine textured soils, a field experiment was conducted at four sites from 2008 to 2010 in Northeast Missouri. The treatments included a non-treated control; V4–V6 applied B at 0.56, 1.12 and 2.24 kg•ha−1; and VT applied B at 0.28, 0.56 and 1.12 kg•ha−1. Foliar B, applied at V4–V6 at 2.24 kg•ha−1, resulted in higher yields than VT applications. No significant differences in yield were found for B applications at different timings for concentrations of 0.56 and 1.12 kg•ha−1. Boron applied at V4–V6 and 2.24 kg•ha−1 increased yield 0.29 Mg•ha−1 compared to the non-treated control. The B applications at VT increased ear leaf tissue B concentration compared to V4–V6 applications and non-treated control, but it had no significant effect on corn yields. No significant difference between B treatments was observed for grain oil, protein, starch or extractable starch concentration; severity of anthracnose stalk rot or common rust; and ear tip fill. The B application of 2.24 kg•ha−1 at V4–V6 decreased the severity of gray leaf spot, but increased the severity of northern leaf blight compared to the non-treated control. Boron applied at V4–V6 at 2.24 kg•ha−1 was the most beneficial timing and concentration evaluated in these fine textured soils.
Kaur, G., & Nelson, K. (2014). Effect of Foliar Boron Fertilization of Fine Textured Soils on Corn Yields. Agronomy, 5(1), 1–18. https://doi.org/10.3390/agronomy5010001