|Author:||Fan, TingLu ; Stewart, B. A. ; Payne, W. A. ; Wang, Yong ; Song, ShangYou ; Luo, JunJie ; Robinson, C. A.|
|Book Group Author:||NA|
Two experiments were conducted in Gansu, China, during 3 consecutive cropping seasons (1996-98) to evaluate the benefits of supplemental irrigation from harvested water. Twelve to 48 mm of irrigation was applied at growth stages of maize (Zea mays) and winter wheat (Triticum aestivum cv. Changwu 134) grown on soil covered with white plastic. Additional 7-year (1997-2003) wheat and 4-year (1999-2002) maize experiments focused on the use of plastic for efficient water use. Irrigation increased grain yield, water use efficiency (WUE), and irrigation water use efficiency (IWUE) for all years. The IWUEs from the combined use of the plastic and 12 mm of irrigation were 6.36 kg m-3 for wheat at the jointing stage and 18.05 kg m-3 for maize at the V15 stage in a dry year, with IWUE being greater by 2- to 6-fold than WUE. Relative to control conditions, plastic applied at sowing increased WUE from 0.77 to 0.98 kg m-3 for wheat and from 1.52 to 1.94 kg m-3 for maize, but the greatest available soil water (ASW) and WUE were achieved when plastic was applied during fallow period before sowing. Grain yield-evapotranspiration relationships were linear with regression coefficients of 1.15 kg m-3 for wheat and 4.56 kg m-3 for maize. Most data points from plastic plots were above the regression line, while most from the control plots were below the line, indicating increased WUE by the plastic. The ASW at sowing was more important for wheat than maize because sufficient rainfall normally occurs during maize season, while the latter portion of wheat season is usually dry.
|Pages:||177 - 188|
crop yield, evapotranspiration, irrigation, maize, mulching,plant water relations, plastic film, plastics, soil water, water useefficiency, wheat, winter wheat, China, Gansu, Triticum, Triticumaestivum, Zea mays, Triticum, Poaceae, Cyperales, monocotyledons,angiosperms, Spermatophyta, plants, eukaryotes, Zea, East Asia, Asia,Developing Countries, North Western China, China, corn, Kansu, soilmoisture, watering, Field Crops (FF005) (New March 2000), Plant WaterRelations (FF062), Plant Production (FF100), Soil Physics (JJ300), SoilWater Management (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management], Soil Management (JJ900)