Effect of foliar boron fertilization of fine textured soils on corn yields

Abstract

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.