Good open source fertigation systems simulator for WINDOWS XP / VISTA / 7 (in metric units)
http://www.agrolaboratory.com/
The keygenerator is online.. you can use it to create how many keys you need.
- Irrigation systems designer
- Hydraulics virtual laboratory
- Irrigation scheduler and weather analyst
- Fertigation simulator (eC, pH, Nutrients, injection rates, solved fertilizers, nutritive eficiency for 50 crops)
[good to learn metric units , use your calculator
]