Protecting raspberries with Haygrove Tunnels gives one of the largest paybacks for growers. Typically yields will be lifted at least 25% to 30% in most climates. Other very important payback benefits for raspberries includes the reduction in wind damage that stunts growth often associated with tall outdoor cane crops and the effects of direct solar radiation which scorches the berries. Scorching is significantly reduced under tunnels especially if the grower selects Light Diffusing Luminance THB polythene.
The following table illustrates the average payback for the spring raspberry variety Tulameen. Overall gain from 5-years of trialling at Haygrove was a +41% gain in income per ha for the tunnelled raspberries compared to the equivalent outdoor crops.
|Haygrove Tunnel||Outdoors||% Difference|
|Total yield/ha (ac)||12.5T/ha
|Class 1 %||97%||90%|
|Picking date||Under tunnels 20% of the fruit picked, on average, two weeks earlier|
|Class 1 yield||12.1T/ha
|Income per ha||£73,466||£52,100||+41%|
System: 8m (26’) bays covering a 3 row raspberry crop. Tunnels skinned in March and enclosed with doors and side skirts