Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Range and levels of the experimental factors according to three-factor central rotatable composite design.
| Range and levels | |||||
|
|
|||||
| Element | –1.68b | –1 | 0 | 1 | 1.68b |
| Na | 70 | 120 | 180 | 250 | 290 |
| P | 20 | 40 | 60 | 80 | 100 |
| K | 60 | 120 | 200 | 280 | 340 |
aN-NH4 + N-NO3.
bRadius adjustment factor for a three-factor design to make the design rotatable.
