|Author:||Li, ZiZhen ; Li, WeiDe ; Li, WenLong|
|Book Group Author:||NA|
Based on a field study on the semi-arid Loess Plateau of China, the strategies of limited irrigation in farmland in dry-period of normal-precipitation years are studied, and the effects on water use and grain yield of spring wheat of dry-period irrigation and fertilizer application when sowing are examined. The study includes four treatments: (1) with 90 mm dry-period irrigation but without fertilizer application (W); (2) with fertilizer application but without dry-period irrigation (F); (3) with 90 mm dry-period irrigation plus fertilizer application (WF); (4) without dry-period irrigation and fertilizer application (CK). The results indicate that dry-period irrigation resulted in larger and deeper root systems and larger leaf area index (LAI) compared with the non-irrigated treatments. The root/shoot ratio (R/S) in the irrigated treatments was significantly higher than in the non-irrigated treatments. The grain yields in F, W and WF are 1509, 2712 and 3291 kg ha-1, respectively, which are 13.7, 104.3 and 147.9% higher than that (1328 kg ha-1) of CK, and at the same time the grain yields in W and WF are also significantly higher than in F. Water use efficiencies (WUE) in terms of grain yield are 5.70 and 6.91 kg ha-1 mm-1 in W and WF, respectively, being 65.7 and 101.1% higher than that (3.44 kg ha-1 mm-1) of CK. The highest WUE and grain yield consistently occurred in WF, suggesting that the combination of dry-period irrigation and fertilizer application has a beneficial effect on improving WUE and grain yield of spring wheat.
|Pages:||133 - 143|
|Journal:||Agricultural Water Management|
biomass production, crop yield, irrigation, leaf area index,plant water relations, root shoot ratio, root systems, semiarid zones,soil water content, spatial distribution, water use efficiency, wheat,China, Gansu, Triticum, Triticum aestivum, Poaceae, Cyperales,monocotyledons, angiosperms, Spermatophyta, plants, eukaryotes,Triticum, East Asia, Asia, Developing Countries, North Western China,China, Kansu, LAI, watering, Field Crops (FF005) (New March 2000), PlantPhysiology and Biochemistry (FF060), Plant Water Relations (FF062),Plant Production (FF100), Soil Physics (JJ300), Fertilizers and otherAmendments (JJ700), Soil Water Management (Irrigation and Drainage)(JJ800) (Revised June 2002) [formerly Soil Water Management]