|Author:||Al-Kaisi, M. M. ; Yin, X. H.|
|Book Group Author:||NA|
Improper N and irrigation management are major factors contributing to water quality and shortage problems in the Great Plains. This study was conducted on the Irrigation Research Farm in Yuma, Colorado, USA, during 1998-2000 to establish an accurate irrigation and N management system for maize (Zea mays) production in the Great Plains aimed at high yield and water use efficiency (WUE) simultaneously. A field experiment was conducted on a centre-pivot-irrigated, well-drained Haxtun sandy loam soil (fine-loamy, mixed, superactive, mesic Pachic Argiustolls) by using a randomized complete block split-split plot design, with irrigation rates (0.60, 0.80, and 1.00 of the estimated evapotranspiration (ET)), N fertility rates (30, 140, 250, and 360 kg ha-1, including N from soil, fertilizer, and irrigation water), and plant populations (57 000, 69 000, and 81 000 plants ha-1) as the main-plot, split-plot, and split-split plot treatments, respectively. A combination of 0.80 ET to 1.00 ET, 140-250 kg N ha-1, and 57 000 to 69 000 plants ha-1 population provided optimum maize yield. Irrigation treatment 0.80 ET, accompanied by 140-250 kg N ha-1, and 57 000 to 69 000 plants ha-1 population was the best management system for optimum WUE. No significant differences in water extraction from the soil profile for the entire season and soil moisture content at harvest between the 0.80 ET and 1.00 ET irrigation treatments were additional indications that 0.80 ET is superior to 1.00 ET. To preserve the Ogallala Aquifer, the best management system aimed at optimum WUE should be used for maize production in the Great Plains region.
|Pages:||1475 - 1482|
application rates, crop yield, irrigation, maize, nitrogen,nitrogen fertilizers, plant water relations, water use, water useefficiency, Colorado, Great Plains States of USA, USA, Zea mays, Zea,Poaceae, Cyperales, monocotyledons, angiosperms, Spermatophyta, plants,eukaryotes, Mountain States of USA, Western States of USA, USA, NorthAmerica, America, Developed Countries, OECD Countries, Great PlainsStates of USA, corn, United States of America, watering, Field Crops(FF005) (New March 2000), Plant Physiology and Biochemistry (FF060),Plant Water Relations (FF062), Plant Production (FF100), Fertilizers andother Amendments (JJ700), Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management]