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Accueil du site → Doctorat → États-Unis → 1987 → EVAPOTRANSPIRATION AND WATER MANAGEMENT OF TURF CANOPIES IN A SEMI-ARID ENVIRONMENT

Colorado State University (1987)

EVAPOTRANSPIRATION AND WATER MANAGEMENT OF TURF CANOPIES IN A SEMI-ARID ENVIRONMENT

FRY, JACK DOUGLAS

Titre : EVAPOTRANSPIRATION AND WATER MANAGEMENT OF TURF CANOPIES IN A SEMI-ARID ENVIRONMENT

Auteur : FRY, JACK DOUGLAS

Université de soutenance : Colorado State University

Grade : Doctor of Philosophy (PhD) 1987

Résumé
Several investigations were undertaken to better define water requirements of turf canopies in an area of limited precipitation. Potential evapotranspiration (ET) was determined using lysimeters in the field in three studies. When evaluated under putting green conditions, annual bluegrass (Poa annua L.) had a significantly lower water use rate (4.6 mm day$\sp-1$) than creeping bentgrass (Agrostis palustris Huds.) (4.9 mm day$\sp-1$) during the summer of 1986, but not 1985. Furthermore, both species had lower water use rates in 1986 when cut at 0.6 cm (4.6 mm day$\sp-1$) compared to 1.2 cm (4.9 mm day$\sp-1$). When ET rates of several turf weeds and groundcovers were evaluated using lysimeters in the field, white clover (Trifolium repens L.), a C$\sb3$ dicot, had the highest mean water use rate of all species (6.6 mm day$\sp-1).$ Dichondra (Dichondra repens J.R. Forst. and G. Forst.) a C$\sb4$ dicot, and barnyardgrass (Echinochloa crusgalli (L.) Beauv.), a C$\sb4$ monocot had the lowest ET rates (4.2 and 4.4 mm day$\sp-1$, respectively). ’Merion’ Kentucky bluegrass (Poa pratensis L.), yellow foxtail (Setaria glauca (L.) Beauv.), and crabgrass (Digitaria ischaemum (Schreb.) Muhl.) exhibited intermediate ET rates. Potential ET rates of ’Merion’ Kentucky bluegrass and ’Rebel’ tall fescue (Festuca arundinacea Schreb.) were determined during establishment using lysimeters. Over two summers, the mean ET rate for these two species was 5.2 and 5.3 mm day$\sp-1$, respectively. In 1985, tall fescue began using significantly more water than Kentucky bluegrass twenty days after seeding. Tall fescue, irrigated at 50 and 100% of potential ET of a mature turf, did not achieve satisfactory establishment at the former irrigation level. Preplant soil incorporation of a hydrophilic polymer was ineffective in enhancing tall fescue establishment during drought. Mature ’Reliant’ hard fescue (Festuca ovina var. duriuscula (L.) Koch.) and ’Rebel’ tall fescue were evaluated in field plots under irrigation levels of 50, 75, and 100% of potential ET, applied on 2, 4, 7, or 14 day intervals. Hard fescue had the best quality when irrigated at 75 or 100% of potential ET on 2 or 4 day intervals. Acceptable tall fescue quality resulted when turf was watered once weekly at 50% of potential ET.

Mots clés : Plant propagation, Biological sciences

Accès au document : Proquest Dissertations & Theses

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