| 摘要 |
<p>Plants, for example vegetables, are grown in inactive growth media, including aquaculture, where the plants are supplied with an aqueous liquid containing a growth or health adjusting agent, such as, for example, nitrogen. The growing is effected by dividing a growth area into a reference area (10) and a production area (11) with substantially the same growth conditions, and supplying to the plants in the reference area (10) a first aqueous liquid in which said agent is present in an empirically determined concentration. The agent is supplied continuously or intermittently to the first liquid in such amounts that the concentration of the agent in said first liquid is substantially maintained at the empirically determined level. The plants in the production area (11) are supplied with a second aqueous liquid with a second fixed, preferably lower, concentration of said agent, and the agent is supplied continuously or intermittently to said second liquid in amounts controlled in dependency of, for example proportionally to, the amounts of the agent added to the first liquid. Thus, it becomes possible to control the plants' content of the growth or health adjusting agent, such as, for example, to reduce the content of nitrate, without involving any substantial yield reduction or quality deterioration.</p> |
