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Boron Fertilization of Corn in Minnesota¹

Six fields (5 soil types) of corn were treated with soluble boron at different rates and methods of application during 1961 and 1962. A fritted trace element treatment (FTE-502) was included in 1961, but a lighter application of FTE-504 in 1962. No boron deficiency symptoms were observed at any growth stage, either on the corn foliage or on the ears. Leaf B concentrations on untreated soil were generally related to soluble soil B. Boron applied either in the corn row or as foliar spray resulted in the highest leaf B concentrations and broadcast B resulted in a lower level. Upper corn leaves sampled in mid-August were highest in B. Optimum leaf sampling at this time is suggested. These five Minnesota soils, having a water-soluble B content of 0.33 to 1.58 ppm, apparently do not require B applications for maximum corn production at this time.

² Former research assistant, Department of Soil Science, University of Minnesota (now Instructor of Agronomy, Virginia Agricultural Experiment Station) and Professor of Soil Science, University of Minnesota.

Received for publication October 30, 1964.