What happens if you water too much or too little with rockwool?
The answer is somewhat dependent on stage of crop growth. Continued saturation of the growing medium reduces root vigor. Too little solution stresses the plant as EC spikes. However, commercial growers use irrigation volume (along with pH balance and fertilizer ratio) to manipulate plants between vegetative and generative growth. For example, a young tomato plant with one-two fruit clusters requires about 1.6 liters of nutrient solution per day under long day length conditions. Reducing the volume of the feed slightly and raising the EC in the root zone stresses the plant and induces generative growth.
