Earliness; 3 weeks earlier using a combination of row cover and tunnels.
Autumn protection; secure production to into the autumn depending on the time of the first severe frosts
Class one yield
Example 30% to 35% higher class one yield for many cut flowers.
Class One %
For example 15% higher class one percentage (normally from 70 to 75% to 85 to 90% class one) for strawberries
Spray days
Guaranteed spray days
Harvest days
Guaranteed harvest days (no stopping pickers because it is raining!)
Lower moisture related disease
Significant reduction in moisture related diseases such as botrytis, black spot, downey mildew and monilinia. About 55% of our production at Haygrove is organic and all under tunnels.
The tunnel also can provide a good infrastructure for biological controls and insect net etc
Ability to deploy polythene, shade net, insect net on the same structure
This has been excellent for crops that need rain cover at certain times, but only shade at other times (e.g. ornamentals, seedlings etc)
Benefits versus steel permanent greenhouses:
Better venting than fixed vent tunnels
Moveable
No site leveling required
Simpler and quicker to build.
Significantly lower cost
Ability to add gantry rails for carrying and picking trolleys etc