Relation of potential evapotranspiration to environment and kind of plant

Abstract

The purpose of this investigation was to establish relationships between potential evapotranspiration and several elements of weather, potential evapotranspiration as influenced by the surroundings and irrigation of the surroundings, and potential evapotranspiration of Kentucky bluegrass, sweet corn, and celery. High correlations were found between measured potential evapotranspiration (PE) of bluegrass and open‐pan evaporation, atmometer evaporation, average temperature, solar radiation, and duration of sunshine when data were grouped into between‐rain periods. When the same data were grouped into seven‐day periods, relatively low correlations were obtained. Uniform surroundings, watered daily, were found to reduce measured PE of bluegrass 23.2 pct below bluegrass in non‐uniform surroundings which were not watered. Measured PE exceeded evapotranspiration computed by the Thornthwaite empirical formula by 10 to 70 pct and appeared more closely associated with amount of rainfall than with mean temperature. Water use by sweet corn was found to be 22.2 pct higher than use by bluegrass. Although the surrounding area of celery was watered each day, PE was 11.0 pct greater than that of bluegrass, the surrounding area of which was not watered. When compared with PE of bluegrass which received daily irrigation of surroundings, water use by celery was 36.8 pct greater.

Onion (Allium cepa L.) and Drought: Current Situation and Perspectives

“…Onions have shallow, fasciculated roots that are slightly branched and extend 0.20–0.25 m deep into the soil [ 23 , 24 ]. This limited root depth restricts water uptake in deep soils [ 25 ], thereby increasing their susceptibility to drought [ 26 ]. The flowers exhibit trimeric symmetry, with three sepals and three petals.…”

Review of cool‐season turfgrass water use and requirements: I. Evapotranspiration and responses to deficit irrigation

“…The Penman-Monteith equation was updated and simplified by FAO (Allen et al 1998) and ASCE (Allen et al 2005) by utilizing some assumed constant parameters for mown turfgrass resulting in the FAO-56 Penman-Monteith equation and ASCE Penman-Monteith equation, respectively. Despite Penman's early discovery, it was not until the late 1970s and early 1980s that turfgrass ET research in cool-season grasses became more widely studied (Biran et al, 1981;Drinkwater & Janes, 1957;Feldhake et al, 1983;Kneebone & Pepper, 1982;Marsh et al, 1980;O'Neil & Carrow, 1982;Tovey et al, 1969). Howard Latimer Penman (1909Penman ( -1984 was a physicist at the Rothamsted Experimental Station (McCulloch, 1985).…”

An Analysis of Actual Evapotranspiration

“…The possible effects of local advection have to be taken into account when comparing calculated evapotranspiration and measured data from lysimeter investigations, if the surroundings have a shortness of water. Experiments with Blue Grass, reported by DRINKWATER and JANES (1957) show a decrease of 23.2% in evapotranspiration from frequently irrigated lysimeters when the direct surroundings were as well supplied with water. LEMON a.o.…”