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Effect of Soil and Foliar‐applied Manganese on the Micronutrient Content and Yield of Soybeans 1
Author(s) -
Randall G. W.,
Schulte E. E.,
Corey R. B.
Publication year - 1975
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1975.00021962006700040012x
Subject(s) - manganese , chemistry , soil water , fertilizer , agronomy , sowing , yield (engineering) , micronutrient , point of delivery , horticulture , biology , materials science , metallurgy , ecology , organic chemistry
Abstract Manganese deficiency of soybeans ( Glycine max (L.) Merr.) will undoubtedly become more prevalent as soybean acreage increases along with strong emphasis on yield maximization. Thus, field experiments were conducted on two soils (Argiaquoll and a Hapludoll) in southern Wisconsin to evaluate sources, rates, and methods of application of Mn fertilizers on soybeans. Two sources, MnSO 4 and Mn‐ethylenediaminetetraacetic acid (MnEDTA), were broadcast, row or foliar‐applied at various rates to Mn‐deficient soils and/or soybeans. Micronutrient concentrations, Mn uptake, and various production parameters were measured. All rates and application methods of MnSO 4 and foliar applications of Mn‐EDTA were effective in supplying Mn to the plant. Row applications of MnSO 4 were somewhat more efficient than broadcast applications. Manganese applied at rates ranging from 5 to 22 kg Mn/ha as MnSO 4 with the starter fertilizer in the row at planting time appeared to be most efficient soil treatments in increasing seed yields. The MnEDTA applied in the row reduced plant weight, leaf Mn, and soybean yields slightly. When Zn was not included in the starter fertilizer, leaf Zn and Cu were increased by the soil‐applied MnEDTA treatments. Leaf Fe was not affected by any of the Mn treatments. Foliar applications of Mn were most effective when applied at the early blossom or early pod set stages or in multiple applications at these stages. Single applications of 2.24 and 4.48 kg Mn/ha as MnSO 4 or 0.51 kg Mn/ha as MnEDTA caused some burning of the foliage. Combined row and foliar methods of application also appeared to relieve Mn deficiency effectively. Small amounts of MnSO 4 applied in the row corrected the Mn deficiency early in the season, whereas foliar applications adequately supplied Mn to the plant later in the growing season. This combination resulted in higher yields than with either row or foliar treatments applied alone.