Deficit irrigation approach for improving irrigation efficiency of maize: a field experiment in Syria.

Book Title: NA
Year Published: 2008
Month Published: NA
Author: Shamaa, A. T. ; Al-Darir, A. N. ; Billib, M. ; Bardowicks, K. ; Panda, S. N.
Book Group Author: NA

A field experiment was conducted at the agricultural research station in Aleppo (Syria) to determine actual evapotranspiration, water use efficiencies, and yield attributes of maize grown in autumn 2003 under normal and deficit irrigation treatments, which is based on maintaining soil moisture status in the root-zone at field capacity. Randomized block design with three replications was adopted in the present study. The experiment includes five irrigation treatments: one normal and other four under deficit irrigations at vegetative, flowering, grain formation, and ripening stage. Under deficit irrigation treatments, two irrigations were cancelled in alternate week at each growth stage in comparison to the number of irrigation applied under normal irrigation. The quantity of water required for each irrigation was calculated so as to compensate the moisture deficit (measured by neutron probe) in a dynamic root-zone depth during all the growth stages. Standard agricultural package of practices were adopted for the cultivation of maize. Actual evapotranspiration was determined using water balance approach in the root-zone at a particular stage. Despite of low depth of irrigation applied in deficit irrigation treatment in flowering and ripening stages, maize produced a relative yield of 93-94%, which was comparable to that produced in the normal irrigation condition (8310 kg/ha). The results of grain yield indicate a non-existence of any LSD between the normal and two deficit irrigation phases during flowering and ripening stages. The present study recommends reduction of two irrigations in flowering and ripening stages of maize, which has negligible impact on yield reduction in comparison to normal irrigation. There is an increase in irrigation water use efficiency in deficit irrigation treatments in flowering and ripening stages of maize. Higher crop water use efficiencies were noticed at the rate of 1.45-1.48 kg/m3 for the treatments under normal and deficit irrigations in flowering and ripening stages.

Pages: 143 - 154
Volume: 43
Number: 2
Journal: Zeitschrift für Bewässerungswirtschaft
Journal ISO: NA
Organization: NA
Publisher: NA
ISSN: 0049-8602

crop growth stage, crop yield, efficiency,evapotranspiration, field capacity, flowering, irrigation, irrigationscheduling, maize, plant water relations, ripening, soil water content,water deficit, water use efficiency, Syria, Zea mays, West Asia, Asia,Mediterranean Region, Middle East, Developing Countries, ThresholdCountries, Zea, Poaceae, Cyperales, monocotyledons, angiosperms,Spermatophyta, plants, eukaryotes, anthesis, corn, watering, Field Crops(FF005) (New March 2000), Plant Physiology and Biochemistry (FF060),Plant Water Relations (FF062), Plant Production (FF100), Plant CroppingSystems (FF150)

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