Two wooden benches, 0.8 m high, 1.0 m wide and
24.0 m long, spaced 0.8 m apart were used to support
the gutters and grow bags. The benches were installed
under a high tubular tunnel structure of galvanized
steel, 3 m wide and 2.5 m high, covered with 150 μm
milky color polyethylene film. On one of the benches,
three rows of six gutters (Hidrogood® Horticultura
Moderna Ltda.) were installed. The gutters were 4.0
m long, 0.22 m high and 0.17 m wide. Each gutter was
filled with 26 L of coconut fibre substrate