what length of time do I water
We installed a drip irrigation system that provides 2 gallons of water per hour. How long should we let the water system drip and how many days per week? We have tomatoes, cabbage, beans and cucumbers in our garden.
Most vegetable crops need about 1 inch of water per week. The length of time you need to water will depend on the spacing of your drip lines, the pressure of water delivery, the size of the area you need to irrigate, soil type, temperature, and stage of plant development.
Here is a link to a publication from Penn State University on determining how long to run a drip irrigation system for vegetables: http://extension.psu.edu/plants/vegetable-fruit/news/2013/determining-how-long-to-run-drip-irrigatio...
You can also contact the manufacturer of the irrigation system you have and see if they publish irrigation schedule for the type of system you have. Also, sometimes it just takes a bit of experimentation to find the right timing.