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Introduction- Integrated Weed Management
The common conception of physical weeding is hoeing weeds from a crop. However, from an IWM perspective hoeing is just the ‘icing on the cake’ or if things are going badly ‘the ambulance at the bottom of the cliff’ (remembering physical weeding is just one part of an integrated weed management system). Relying on in-crop weeding as the sole or even main means of weed management is likely to result in weed management becoming impossible after just a few years. Based on scientific research and our own extensive practical experience PhysicalWeeding believes that one of the most important aspects of physical weed management in annual crops, especially vegetable and similar lower competitive crops, are false and stale seedbeds. These are not new ideas, and were widely practiced before the advent of herbicides, but during the last fifty years they have slipped from living memory. These terms are also often used interchangeably, however, here they are considered to be two distinct but related approaches. False and stale seedbedsThe most detailed explanation of false and stale seedbeds available anywhere can be downloaded for free from the Future Farming Centre website The false and stale seedbed techniques are based on three ‘golden rules’:
This knowledge can be used to eliminate many, if not most, of the weeds that would normally infest an annual crop at establishment. This is done by creating a planting tilth but then delaying planting so that the weeds germinate and/or emerge before the crop and are then killed either by further tillage, thermal weeding or herbicides. The former is called a false seedbed, as the original seedbed is not the true final seedbed, i.e., it’s a false seedbed and the latter a stale seedbed as the first seedbed has aged, or become ‘stale’, by the time the crop is planted and/or emerged. The two diagrams below show the details of how false and stale seedbeds work.
Each of these techniques has a component that is critical for its success. For false seedbeds re-tillage must involve the minimum depth of tillage necessary to kill all weedlings, and must be less than 5cm / 2” otherwise non-dormant weed seeds could be brought up from lower soil levels which then germinate in the crop. For stale seedbeds the thermal weeder should be used as close to crop emergence as possible to get the greatest benefit which means it needs to be both fast and effective as the time-window for successful treatment can be very short, e.g., hours. However, until now there were no tillage machines on the market that were specifically designed to achieve optimum false seed retillage, and many existing thermal weeders are too inefficient, in terms of work rates and/or fuel consumption. PhysicalWeeding is your one-stop solution for optimal false seedbed tillers, flame weeders and steam weeders. |