|Author:||Abdullah, K. ; Ismail, T. G. ; Yusuf, U. ; Belgin, C.|
|Book Group Author:||NA|
The effects of mulch (clear polyethylene) and irrigation water application (1.0, 0.75, 0.50, 0.25 and 0 times the soil water depletion) on soil evaporation and lettuce transpiration, evapotranspiration and yield were studied in a glasshouse pot experiment from 10 August to 2 October 2001. Water losses by evaporation and/or transpiration were measured daily by weighing the pots. Irrigation water was applied twice a week. The water quantities were regulated by weight. Increasing the amount of irrigation water significantly increased crop evapotranspiration (mean 45%) in the open soil surface (OSS) treatments and transpiration (mean 26%) in the covered soil surface (CSS) treatments. In CSS treatments, evapotranspiration was significantly reduced, while transpiration was significantly increased compared with OSS treatments. Covering the soil surface reduced the amount of irrigation water required by the lettuce crop by approximately 60% for all irrigation treatments compared with the amount of irrigation water added in the OSS treatments, because wet soil surface evaporation was eliminated. The contribution of soil evaporation to total evapotranspiration and evaporation-transpiration ratio varied from a minimum of 40 and 66% at the highest water level to a maximum of 49 and 94% at the lowest water level, respectively. Lettuce yield was significantly higher in CSS treatments than in OSS treatments. Especially at low water levels, lettuce yield was higher in CSS than in OSS treatment. Water use efficiency in CSS and OSS treatments was highest for the highest water level, and irrigation water use efficiency was highest for the lower water level in CSS treatments and for the intermediate water level in OSS treatments.
|Pages:||751 - 755|
|Journal:||Journal of Biological Sciences|
crop yield, evapotranspiration, irrigation, lettuces,mulching, plant water relations, plastic film, soil water balance,transpiration, water use efficiency, Lactuca sativa, Lactuca,Asteraceae, Asterales, dicotyledons, angiosperms, Spermatophyta, plants,eukaryotes, watering, Horticultural Crops (FF003) (New March 2000),Plant Water Relations (FF062), Plant Production (FF100), Soil Physics(JJ300), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management], Soil Management(JJ900)