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Evaluation of Inorganic and Organic Manganese Fertilizer Sources¹

ABSTRACT

Little detailed information is available on the effectiveness of various inorganic and organic manganese (Mn) fertilizer sources in correcting deficiencies. Field experiments were conducted to evaluate the effectiveness of Mn sources for soil and foliar applications. In soil studies, MnSO₄ was compared with two inorganic sources, Mn-oxysulfate and MnO. The percent water soluble Mn in the latter two sources was 55 and 0%, respectively. Granular (1.00 to 3.35 mm) inorganic sources were applied at rates up to 90 kg Mn ha^–1. The MnO was composed of < 45 µm particles compressed into granules. Granular MnSO₄ and Mn-oxysulfate were equally effective, wheras MnO was ineffective. Soybean (Glycine max. L.) yield was increased two years after application by the sulfate and oxysulfate sources at rates of 10 and 30 kg Mn ha^–1 with optimum yield occurring at the 30 kg Mn ha^–1 rate. Manganese sulfate was also compared with organic sources, Mn-ethylenediaminetetraacetic acid (MnEDTA), Mn-diethylenetriaminepentaacetic acid (MnDTPA), and several lignosulfonates, in field studies at rates up to 13 kg Mn ha^–1. The organic Mn sources chelates and complexes, as well as the sulfate, were ineffective at about 1 kg Mn^–1 when broadcast and band applied. When the complexes were broadcast at rates of 3 to 13 kg Mn ha^–1, they were similar in effectiveness to MnSO₄ applied at the same rates. In the foliar study, three soluble inorganic sources, MnSO₄, MnCl₂, and Mn(NO₃)₂, and the organic sources, MnEDTA and two Mn-lignosulfonates, were evaluated. Both the inorganic and organic sources were equally effective in increasing yields.

¹ Paper no. 9352 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh, N.C. 27695.

² Former Graduate Research Assistant and Professor of Soil Science, respectively, North Carolina State Univ., Raleigh, N.C. 27695.

Received for publication July 5, 1984. Accepted for publication September 20, 1984.