Sounds about right to me.

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Note added at 11 mins (2014-05-17 19:25:52 GMT)
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See e.g.:

‘LG cultivation gutter: growing sweet bell peppers without loss of height and without entry of dirt.
The LG gutter has specially been developed for sweet-bell-pepper cultivation, but is also applicable to the cultivation of tomatoes and cucumbers. The LG gutter is available in different sizes.’ (http://www.formflex.nl/products.php?p=28&lang=ca&link=Cultiv... )

‘GREENHOUSE WITH CULTIVATION GUTTER

The invention relates to a (Dutch-type) greenhouse comprising a roof construction, at least one row of several support legs, which support at least part of the roof construction, and a cultivation gutter extending in the direction of said row inside the greenhouse and being supported by successive legs in the row.’ (http://www.google.com/patents/WO2013172704A1?cl=en )

‘The invention relates to a greenhouse with a cultivation gutter. Such greenhouses comprise a roof structure supported by supporting columns. Within the greenhouse cultivation gutters are positioned that extend parallel to each other and between which an aisle is defined. (...)

2. Greenhouse, according to claim 1, wherein the supporting columns in a direction transverse to the row have two sides, wherein at least a part of the cultivation gutter extends within the sides of the successive supporting columns.’ (http://www.google.com/patents/US8448378 )

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Note added at 16 mins (2014-05-17 19:30:39 GMT)
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aka ‘teeltgoot’

See e.g.:

https://www.google.co.uk/search?q=teelgoot&es_sm=93&source=l... (Google search for: "cultivation gutter" teeltgoot)

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Note added at 18 mins (2014-05-17 19:32:11 GMT)
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http://www.pb-techniek.nl/download/Leaflets/Stalen-teeltgoot...