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| Effects of supplemental irrigation and different nitrogen and phosphorus rates on yield and water use efficiency of <i>Triticum aestivum</i> L. on Loess Tableland |
| Zhang Yiwang1,2,Liu Wenzhao1 |
| 1.Institute of Soil and Water Conversation,CAS&MWR,Northwest Sci-Tech University of Agriculture and Forestry,712100,Yangling,Shaanxi;2.Graduate School of the Chinese Academy of Sciences,100049,Beijing: China |
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Abstract Effects of supplemental irrigation and different nitrogen and phosphorus rates on crop yield,soil water content,and water use efficiency of Triticum aestivum L.were studied by using a randomized complete block split plot design.Results indicated that soil water consumption depth increased along with wheat growing stages,which went down to 1.2 and 2.2 m during pre-wintering stage and booting stage respectively.Soil water content for different treatments had no significant difference in initial stages,however,after booting stage,soil water content for the treatments of different nitrogen and phosphorus rates were significantly lower than that for non-fertilization application.Soil water content for rain-fed and supplemental irrigation treatments had no significant difference.Both supplemental irrigation and different nitrogen and phosphorus rates treatments increased crop yields and significantly increased soil water consumption.Supplemental irrigation increased crop yields,but had no significant difference than rain-fed treatment,however,the nitrogen and phosphorus application treatment increased crop yields from 134% to 240% more than non-fertilization application treatment.Application of different nitrogen and phosphorus ratessignificantly increased water use efficiency of Triticum aestivum L..Howerver,supplemental irrigation decreased water use efficiency from 3% to 30%,which had no significant difference statistically.The different nitrogen and phosphorus rates treatments significantly improved crop yield compared with supplemental irrigation.Supplemental irrigation and the treatment of high nitrogen and high phosphorus rate significantly increased crop yield and gave higher water use efficiency.
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Received: 18 March 2009
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