Effects Of Wide-precision Planting And Deficit Irrigation On Water Use Efficiency Of Winter Wheat

In order to response to the crisis of water resources and better develop water-savingplanting pattern in North China Plain, in2010-2011and2011-2012winter wheat growingseasons,2kinds of planting patterns, i.e., wide-precision planting andconventional-cultivation planting, and3different irrigation treatments, i.e., irrigated60.0mmeach at jointing and heading stages, irrigated60.0mm only at jointing stage, andnon-irrigation in the whole growing season were conducted, to study the effect ofwide-precision planting pattern and deficit irrigation on population dynamic, leaf area index(LAI), photosynthetic rate, intercellular CO2concentration, dry matter accumulation,photosynthetically active radiation (PAR) capture ratio, evapotranspiration of field, water useefficiency of different level and grain yield of winter wheat. The results indicated that:Deficit irrigation and wide-precision planting had a significant influence on yield ofwinter wheat. The demise of wide-precision planting tillers was lower than that ofconventional-planting pattern. At milking stage, the wide-precision planting irrigated60.0mm each at jointing and heading stages significantly (LSD, P<0.05) increased the amount ofdry matter accumulation. Compared with the conventional-cultivation planting, thewide-precision planting irrigated60mm each at jointing and heading stages had the highestgrain yield, which can be attributed to increase spike numbers. The LAI of the wide-precisionplanting increased within a certain range, improved photosynthesis of winter wheat. The PARcapture ratios on the height of40and60cm above the groundsurface of wide-precisionplanting were all higher than those of the conventional-cultivation planting. Then it has agreat potential to improve the final yield of winter wheat.Without regard to irrigation, there was no significant difference between wide-precisionplanting and conventional-cultivation planting on total evapotranspiration of winter wheatfield in the whole growth period. They were almost the same. But the space consumption ofsoil moisture was different between each other. Wide-precision planting can be preferablyabsorb and utilize deep layer soil moisture than conventional-cultivation planting. Theirconsumption of soil water in the growing stage was not significantly (LSD, P<0.05) differentbetween each other.Wide-precision planting pattern has increased the water use efficiency of leaf level, group production level and final yield level in varying degrees. Therefore, wide-precisionplanting pattern has more conducive to improving the moisture efficiency of the winter wheatin conditions of sufficient water.In summary, the results indicate that the wide-precision planting irrigated60mm each atjointing and heading stages of winter wheat should be extended in North China Plain whicharea lack of water resource.