APPLICATIONS OF POTASSIUM FERTILIZERS...TIMING OF USE

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Timing and Frequency

The most appropriate rate and timing of potassium application depends on both the soil type to which it is being applied, and the potassium requirement of the crop or pasture.

In most annual crops it is usual to apply the crop potassium requirements at or before planting. However, where soils have very limited capacity to retain potassium from leaching (for example a sandy soil with a low cation exchange capacity) it may be preferable to make two or three applications of potassium fertilisers. On the other hand, soils which contain a lot of potassium fixing minerals may also require several applications to reduce the time of contact between the added potassium and the soil minerals.

The objective of potash fertiliser application is to ensure adequate potassium is available during periods of peak potassium demand by the crop. In pastures, potassium is applied prior to the growing season in early spring, autumn or both.

Split applications are recommended on soils with a high leaching potential, or to minimise luxury uptake where high rates are used.

Placement

Decisions regarding placement of potassium fertiliser should be based on:

1. The pattern of plant potassium requirement

For those crops which require potassium early in the growing season, like maize, fertiliser should be placed in the soil where it will be readily accessible to seedling roots.

2. Prevention of salt injury to seed

Too much potassium fertiliser placed too close to the seed can reduce germination or injure new roots because of high salt concentrations.

3. Available labour, equipment and timing of other farming operations

Ideal fertiliser placement may not be possible because of a need to perform operations within a given time frame, or because suitable equipment is not available.

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CHEMICAL

FERTILIZERS

FORMULATIONS

ENCYCLOPEDİA

is enough.

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CHEMICAL

FERTILIZERS

FORMULATIONS

ENCYCLOPEDIA

is written clear and understandable.

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