Physical Description:
Colour varies with rock types from pink to brown or dark grey granules.
Uses:
Magnesium superphosphate, a mixture of magnesium oxide and superphosphate, contains soluble phosphate, sulphate sulphur, calcium and magnesium and is a suitable fertiliser for capital or maintenance applications. It is also ideal for pastoral development and arable/horticultural situations where immediate responses are required, although the magnesium component requires time to dissolve and so early application for short-term rapid growth crops is recommended.
Benefits:
Magnesium superphosphate is a multi nutrient fertiliser which suits different land uses. It is especially useful on yellow brown pumice soils where the parent materials contain little or no Mg and must be supplied from fertiliser Mg sources for both plant and animal responses.
Application:
Spreading rates for magnesium superphosphate vary greatly governed principally by P requirement, but it is not recommended to be spread at rates of over 1 tonne/ha. Actual spreading rates will vary according to farm type, climate, productivity and soil type - it is best to confirm rates with a Field Officer. The rate spread should be determined by the need for the major nutrients.
Storage & Handling:
Unlike most solid fertilisers magnesium superphosphate may set, and so should be applied as soon as possible after mixing at the store.