Full Text PDF | Evapotrasnpiration, automation,potted plants, soil moisture.
A rapid and reliable method to estimate water requirements for chrysanthemum production with practical applications to commercial operations was developed to promote water conservation. A water-requirement prediction equation (R2 = 0.71) that used class A pan evaporation along with plant-canopy height and width as input variables was generated. Equation verification was carried out by comparing vegetative growth and quality of crops irrigated according to the generated water- requirement equation to crops irrigated based on demand and conservative fixed daily irrigation regimes. Vegetation growth of the plants irrigated with the generated equation was smaller than plants grown by demand irrigation, but plant quality was not significantly different. Applied water was significantly lower for plants irrigated with the generated equation than would normally be applied in a commercial operation using a conservative fixed daily irrigation rate. The study showed that there was a close relationship between chrysanthemum water requirements and the plant and evaporative data. A simplified ET equation involving plant characteristics and evaporative data could be used in the irrigation scheduling of chrysanthemum grown under restricted root volume.