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Primary Tillage

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1. Primary tillage is the first working after the last harvest and normally the most aggressive tillage operation.
2. It is normally undertaken when the soil is wet enough to allow the field to be ploughed and strong enough to give reasonable levels of traction.
3. This can be immediately after the crop harvest or at the beginning of the next wet season. When there is sufficient power available some soil types are ploughed dry.
The objectives of primary tillage are:
1. Till the soil to attain a reasonable depth (10-15cm) with varying clod sizes.
2. Kill weeds by burying or cutting and exposing the roots
3. Soil aeration and water accumulation. Depending on the soil type and the plough the soil will normally be inverted aerating the deep layers and trapping water during a rainfall event
Chop and incorporate crop residues

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