|Author:||Colaizzi, P. D. ; Schneider, A. D. ; Evett, S. R. ; Howell, T. A.|
|Book Group Author:||NA|
Subsurface drip irrigation (SDI), low-energy precision application (LEPA), and spray irrigation can be very efficient by minimizing water losses, but relative performance may vary for different irrigation system capacities, soils, crops, and climates. A three-year study was conducted at Bushland, Texas, in the Southern High Plains to compare SDI, LEPA, and spray irrigation for grain sorghum on a slowly permeable Pullman clay loam soil. Performance measures were grain yield, seed mass, soil water depletion, seasonal water use, water use efficiency (WUE), and irrigation water use efficiency (IWUE). Each irrigation method was compared at five irrigation levels: 0%, 25%, 50%, 75%, and 100% of crop evapotranspiration. The irrigation levels simulated varying well capacities typically found in the region and dryland conditions. In all three years, SDI had greater yield, WUE, and IWUE than other irrigation methods at the 50% irrigation level and especially at the 25% level, whereas spray outperformed SDI and LEPA at the 75% and 100% levels. Differences in seed mass, soil water depletion, and seasonal water use were usually insignificant at the 25% and 50% levels and inconsistent at the 75% and 100% levels. Performance was most sensitive to irrigation level, then year, and then irrigation method, although relative rankings of performance for each irrigation method within an irrigation level were consistent across years. For this climate and soil, SDI offers the greatest potential yield, WUE, and IWUE for grain sorghum when irrigation capacities are very low.
|Pages:||1477 - 1492|
|Journal:||Transactions of the ASAE|
application rates, clay loam soils, crop yield,evapotranspiration, Mollisols, plant water relations, precisionagriculture, seasonal variation, seeds, soil types, soil water content,sprinkler irrigation, subsurface irrigation, trickle irrigation, wateruse, water use efficiency, Texas, USA, Sorghum bicolor, Sorghum,Poaceae, Cyperales, monocotyledons, angiosperms, Spermatophyta, plants,eukaryotes, Southern Plains States of USA, West South Central States ofUSA, Southern States of USA, USA, North America, America, DevelopedCountries, OECD Countries, Great Plains States of USA, Gulf States ofUSA, precision farming, seasonal changes, seasonal fluctuations, sitespecific crop management, spray irrigation, United States of America,Forage and Fodder Crops (FF007) (New March 2000), Plant Water Relations(FF062), Plant Production (FF100), Soil Physics (JJ300), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management]