LPM (version 3.2)

PWN: Crop Water requirement

Description

Calculate the monthly irrigation requirement of crops based on cumulative probability [p] and daily watering duration of irrigation [h]

Usage

PWN(x1, frvol, R, p, irr)

Value

Values

Monthly water requirement values [m3/ha] relating to the cumulative probability indicated (p)

Flow

Irrigation flow [l/s/ha] relating to the daily watering duration (irr) and cumulative probability (p)

Arguments

x1

Bivariate series of monthly cumulative rainfall and average monthly temperatures

frvol

Volume fraction of the soil. It is 0.10 for sandy soil, 0.20 fpr loamy soil, 0.18 for clayey soil, 0.13 for medium-textured soil

R

Length of plant roots [cm] --- see FAO-24 Mannini reworked, maximum extraction depth

p

Cumulative probability of plant's water requirement [percent]

irr

Daily watering duration of irrigation [h]

Author

Corrado Tallerini

References

United States Department of Agricolture (USDA - SCS). IRRIGATION - National Engineering handbook.

Moisello U. "Idrologia Tecnica" La Goliardica Pavese.

Genovesi R., Bottau D. "L'importanza della falda nell' alimentazione idrica delle colture nella pianura emiliano-romagnola."

Regione Campania - Assessorato Agricoltura - Settore S.I.R.C.A. La tessitura del suolo (foglio divulgativo novembre - dicembre 2002)

Fao irrigation and dreinage paper N. 24 - Crop water requirement, Food and agriculture organization of the united nations ROME, rivisited 1977

Grimaldi, S. Tallerini, C., Serinaldi, F., "Modelli multivariati lineari per la generazione di serie di precipitazioni giornaliere", Giornata di Studio: Metodi Statistici e Matematici per l'Analisi delle Serie Idrologiche, Napoli, maggio 2004

Examples

##---- data(Pistoia)
##---- PWN(Pistoia,0.13,40,75,16)
##---- Calculate the monthly irrigation requirement of a plant (Length of plant roots 40 cm in
##---- a medium-textured soil) based on a 75% cumulative probability and 16 hours daily irrigation