| Hs | solar radiation inside greenhouse measured by sensors (Wm−2) |
| Hf | solar radiation inside greenhouse estimated by LMS filter (Wm−2) |
| Hc | solar radiation inside greenhouse estimated by astronomy and geometry method (Wm−2) |
| Hout | horizontal solar radiation outside the greenhouse (Wm−2) |
| H0 | extraterrestrial solar radiation (Wm−2) |
| Kt | clearness index (dimensionless) |
| Hi | solar radiation inside greenhouse (Wm−2) |
| Hb | beam part of extraterrestrial solar radiation (Wm−2) |
| Hd | diffuse part of extraterrestrial solar radiation (Wm−2) |
| τb | film transmittance of beam radiation (dimensionless) |
| τd | film transmittance of beam radiation (dimensionless) |
| τg | greenhouse transmittance (dimensionless) |
| Ri | energy intercepted by canopy (MJ m−2 day−1) |
| Rs | energy intercepted by canopy calculated by sensor data (MJ m−2 day−1) |
| Rf | energy intercepted by canopy calculated by LMS method (MJ m−2 day−1) |
| Rc | energy intercepted by canopy calculated by astronomy and geometry method (MJ m−2 day−1) |
| Vu | water requirement volume (mL plant−1) |
| Vs | water requirement volume calculated by sensor data (mL plant−1) |
| Vf | water requirement volume calculated by LMS method (mL plant−1) |
| Vc | water requirement volume calculated by astronomy and geometry method (mL plant−1) |
| Gsc | solar constant (1367 Wm−2) |
| δ | daily solar declination (degree) |
| ωs | sunset hour angle (degree) |
| ϕ | latitude of the location (degree) |
| nday | the day number of the year (dimensionless) |
| LAI | leaf area index (dimensionless) |
| k | extinction factor (dimensionless) |
| GDD | growing degree days (dimensionless) |
| Ts | sampling interval(s) |
| Tstart | start time of water requirement calculation (hh: mm) |
| Tstop | stop time of water requirement calculation (hh: mm) |
| μ | step size of LMS filter (dimensionless) |
| λ* | latent heat of vaporization (2.45 MJ kg−1) |
| L | length of LMS filter (dimensionless) |
| λ | eigenvalue of auto correlation matrix of the input signal |
| Rxx | auto correlation matrix of the input signal |
| Rdx | cross correlation matrix of the input and desired signals |
| PEcs | water volumes percent error calculated according to astronomy and geometry method and sensors data (dimensionless) |
| PEfs | water volumes percent error calculated according to LMS method and sensors data (dimensionless) |
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.