|Author:||Du, TaiSheng ; Kang, ShaoZhong ; Zhang, JianHua ; Li,FuSheng|
|Book Group Author:||NA|
A field experiment was carried out over 2 years to investigate the effect of partial root-zone irrigation applied using drip irrigation on the water use and yield of cotton (Gossypium hirsutum) in oasis fields of arid north-west China. Two irrigation treatments, i.e., conventional drip irrigation (CDI, both sides of plant row watered) or alternate drip irrigation (ADI, both sides of plant row alternatively watered) were applied under plastic mulch. Three irrigation levels (i.e., 15, 22.5, 30 mm during 2004 and 12, 18, 24 mm during 2005) were applied at each irrigation. Monitoring of soil water contents in the ADI treatment indicated a change in root-zone uptake in response to the irrigation method, although there existed some lateral soil water movement from the wetted side to the dry side after each watering. Stomatal conductance in ADI was lower than that of CDI when compared at the same irrigation level. Reduced stomatal conductance and water loss resulted in higher water use efficiency (WUE) in the ADI treatment. About 31-33% less total irrigation water was applied using the ADI method when compared to that of the CDI treatment with a similar seed cotton yield. ADI also yielded 11% more pre-frost seed cotton than CDI in 2005, indicating a better lint quality and higher price. These results suggest that ADI should be a useful water-saving irrigation method in arid oasis fields where cotton production is heavily dependent on irrigation and water resources are scarce.
|Pages:||147 - 159|
cotton, crop yield, growth, leaf conductance, mulching,plant water relations, soil water content, soil water movement, stomatalmovement, uptake, water use, water use efficiency, Gossypium, Gossypiumhirsutum, Gossypium, Malvaceae, Malvales, dicotyledons, angiosperms,Spermatophyta, plants, eukaryotes, Horticultural Crops (FF003) (NewMarch 2000), Plant Physiology and Biochemistry (FF060), Plant WaterRelations (FF062), Plant Production (FF100), Soil Physics (JJ300), SoilWater Management (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management]