Choose meth­ods for man­ganese prop­erly


Like all nu­tri­ents, man­ganese (Mn) can be supplied in dif­fer­ent forms.

Re­search has shown that man­ganese is in­ef­fec­tive banded in a liq­uid stream at seed­ing, ir­re­spec­tive of whether it is banded as a sul­phate, ox­ide or chelate.

On the other hand, fo­liar ap­pli­ca­tions can be quite ef­fec­tive but re­sponses may not be as re­li­able as band­ing man­ganese in a gran­ule at seed­ing.

De­fi­cient crops may need two or three fo­liar ap­pli­ca­tions to be fully ef­fec­tive.

CSBP field re­search man­ager James Eas­ton said this year CSBP had been in­ves­ti­gat­ing the need for man­ganese in tri­als across the State.

Some of these tri­als are in­ves­ti­gat­ing the ef­fec­tive­ness of man­ganese ox­ides (MnO and MnO2) to the man­ganese sul­phate supplied in all of CSBP’s man­ganese prod­ucts.

“Our big­gest re­sponses to man­ganese have been at a trial at Bol­gart where there re­sponses to 4kg of Mn/ha supplied by Agstar Man­ganese and Agflow Man­ganese, but no re­sponse to 4kg of Mn/ha supplied by the ox­ide (coated on to Agstar),” he said.

Plant tests showed that none of the man­ganese from the ox­ide had be­come avail­able (fig­ure 1).

At Badgin­garra, plant tests in­di­cated that yield re­sponses were unlikely but in­di­cated that the sul­phate form (supplied by AgMn and K-Till Man­ganese) is more ef­fec­tive than ox­ides coated onto K-Till Ex­tra Plus (fig­ure 2).

“Both tri­als high­light the im­por­tance of us­ing ef­fec­tive fer­tiliser sources,” Mr Eas­ton said.

Crops us­ing Agstar MnO2 (4kg of Mn) on the left per­formed bet­ter than crops with Agstar Man­ganese (2kg of Mn).

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