Uses for Manganese Sulphate in Horticulture

Plants use manganese (Mn) for enzyme activity involved in carbohydrate metabolism. They also use it for making fatty acids in evergy transfers during photosynthesis. Manganese Sulphate supplies manganese, which is used to alleviate manganese deficiencies. These are most common in peat mixes. A manganese sulpahte solution is used to correct and prevent manganese deficiency in a wide range of agricultural and horticultural crops.

Manganese sulphate is also applied to mixes or as a foliar application for crop production where a history of Mn deficiency exists. If applied as a foliar, ensure Manganese Sulphate Soluble is requested.

Foliar sprays are the most effective way of applying manganese sulfate solution. If applied directly to the soil the manganese can become “locked up” especially in calcareous high pH soils.

Manganese deficiency occurs mainly in high pH conditions, sandy soils that are low in organic matter, organic miss (peats) and in over-limed soils. Uptake of manganese decreases with increased soil pH and is adversely affected by high levels of available iron (Fe). Cereal crops, potatoes, vines and fruit crops grown on high pH conditions are particularly sensitive to manganese deficiency.


Deficiency Symptoms:

Yellowing of the new growth
Inter-veinal chlorosis
Patchy appearance of the crop
Brittleness of the flag leaves
Premature leaf drop
Delayed maturity (especially in lupins)

Apply manganese sulfate solution to actively growing plants, early to mid tillering. Reapply as necessary.

Analysis (w/v):


Manganese (Mn) – 170 g/l (as sulfate)
Sulfate (S)  –  80 g/l (as sulfate)
pH – 5.0
Specific gravity (SG) – 1.40


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