Rolling is a suprisingly important operation that helps the establishment and growth of crops in the early stages of their growth. However, timing is critical if benefits are to be achieved.
The
most common and important use of rolling is immediately following the
drilling of a crop. Rolling in this situation consolidates the soil
around the young seed which helps make moisture and nutirents more available
to the young plant. If rolling is not completed within a few days of
the crop being drilled, the operation will have to wait for good conditions
after the crop has emerged.
If
the crop was not rolled after drilling, the rolling will wait until
the crop is well established. In the case of some winter crops this
could be the following spring. Rolling has to be carried out when the
surface of the ground is dry. Rolling a crop may at first sight appear
somewhat destructive and it is true that the crop suffers some damage.
However, the subsequent benefits in terms of consolidation of the ground
and a reduction in slug activity, make good the early set back to the
crop.
The
image depicts a rolled area on the right hand side of the image. Soil
clods have broken down and the soil structure has firmed around the
roots of the plant making the plant better able to utilise nutrients
and moisture. By breaking down the clods on the surface rolling reduces
the overall surface area of the field and this reduces moisture loss
and soil erosion in times of drought.
Rolls
consolidate the ground evenely, however tractors do not! In this image
an additional set of wheels have been added to the tractor to reduce
the pressure that the tractor exerts on the ground. If the farmer rolls
the crop when conditions are too damp the tractor wheels will leave
ruts that cause crop loss.
Rolls
consist of either flat metal rolls like the one illustrated or of a
series of heavy rings. Rolls are typically 20 feet wide.
Statistics for Rolling
|
2000 |
2001 |
2002 |
2003 |
2004 |
2005 |
2006 |
2007 |
2008 |
|
| Grass <5 years (000 hectares) |
1226 | 1205 | 1243 | 1201 | 1246 | 1193 | 1137 | 1176 | 1141 | Grass >5 years (000 hectares) |
5363 | 5584 | 5519 | 5683 | 5620 | 5711 | 5965 | 5965 | 6036 | Production area total cereals (000 hectares) |
3348 | 3014 | 3245 | 3059 | 3130 | 2920 | 2856 | 2884 | 3274 |
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