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  • Dr. Doug Waterer (Retired) University of Saskatchewan Saskatoon SK Canada Vegetable Research Articles
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  • Plant Growth Control by Photoselective Filters Low Tunnels (1999-2001) - 3 pages

Plant Growth Control by Photoselective Filters Low Tunnels (1999-2001) - 3 pages

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Many warm season vegetable crops benefit from the cover provided by low tunnels. The

period that plants can be left in this protected environment is limited - as the plants

quickly outgrow the available space. Recently, photoselective filters have been developed

that alter the ratio of red to far-red light in incoming sunlight. Plants grown under this

filtered light are short and robust - making them ideally suited for a confined growing

environment. We conducted trials from 1999-2001 to determine if growing crops under

row covers constructed of a photoselective type of polyethylene would produce a more

compact growth habit - allowing the covers to be maintained over the crop for extended

periods.

In 2000, Melons (cv Earligold) were transplanted into rows of IRT mulch in early June.

At transplanting, sections of each row were covered with tunnels constructed of either

standard perforated clear polyethylene or photoselective filter (Photomorphogenesis

Control Film - YXE10 Mitsui Chemicals Inc.). The tunnels were supported above the

crop using wire hoops. The ends of the tunnels were closed.

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