Method of treating water for horticultural uses
US4149970A · kind A · utility
18Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1978 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Jan 11, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P60/21
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a method for operating a nutrient film plant growth technique so as to minimize the build up of one chemical in the circulating solution without a corresponding build-up of other chemicals, notably nutrient chemicals, therein. For example the feed of nutrient chemicals is in proportion to the feed of water to the solution, or the concentration of non-nutrients is maintained at a low level or discounted when assessing the amount of nutrient to add to the solution to maintain the desired nutrient level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.