Ec (electrical conductivity) is a measurement of dissolved salts in a solution. as a hydroponic gardener, ec measures how strong your hydroponic solution is. too strong and your plants will burn and ultimately be unable to absorb water and nutrients. too weak and your plants will struggle to develop due to a lack of nutrients.. Then forget the chart. here's a good general guide for a hydroponic garden with mixed plants: lettuces and herbs should be grown separately, like in a lettuce raft or dedicated herb unit. go with [0.5-1.5 ec/ 5-15 cf/ 300-1000 ppm] most other veggies: [1.4-2.4 ec/ 14-24 cf/ 980-1680 ppm] tomatoes, the heaviest feeders of all: [2.2-2.8 ec/. This is a handy seasonable vegetable grow guide for growing with hydroponics or quality grow media (terra professional soil). we have included the recommended ec, ph and best grow media (clay pebbles, coco coir or terra professional) for each type of vegetable.nnthe recommended season for growing each type of vegetable is listed in the format s (summer), a (autumn), w (winter) and s (spring)..
