Effects of water-retaining agent on soil moisture,photosynthesis characteristics of Triticum aestivum L.
YANG Yong-Hui-；Tun-Pu-Te-；Wu-Ji-Cheng-；Huang-Tie-Bin-；Feng-Gao-；Guan-Xiu-Juan-；He-Fang
1.College of Resource and Environmental Sciences,Northwest A & F University,712100,Yangling,Shaanxi;2.Institute of Plant nutrition & Resource Environment,Henan Academy of Agricultural Sciences,450002,Zhengzhou;3.Institute of Soil and Water Conservation,Chinese Academy of Sciences & Ministry of Water Resources,712100,Yangling,Shaanxi;4.China University of Mining & Technology-Beijing,100083,Beijing: China
Abstract：In order to investigate the characteristics of soil moisture,leaf relative water content(LEWC) and photosynthesis of Triticum aestivum L.in different growth stages,the field trial,which researched the effect of water-retaining agent(WRA)(0,30,60,90kg/hm2) on soil moisture,leaf relative water content and photosynthetic characteristics,was carried out.The results indicated that 1) soil moisture in 0-20cm deep soil increased obviously from returning green stage to booting stage with the increase of the WRA.Meanwhile,the WRA added soil moisture in 20-40cm deep soil in different growth stages of Triticum aestivum L.and soil moisture were as follows: 60kg/hm2 > 90kg/hm2 > 30kg/hm2 > CK(0kg/hm2).2) LEWC indicated that at jointing stage,LEWC decreased with the increase of the WRA but evidently higher than CK,while was were no difference between 90kg/hm2 and 30kg/hm2 of the WRA.At booting stage,LEWC of 90kg/hm2 was highest compared with other treatments and that of CK was lowest.At grain-filling stage,there was no difference remarkably between the treatments of the WRA but evidently higher than CK.3) Photosynthetic characteristics of Triticum aestivum L.in different growth stages were as follows: photosynthetic rate,transpiration rate and leaf water use efficiency were relatively highest under the 60kg/hm2 of water-retaining agent compared with other treatments of the WRA,while that of 30kg/hm2 and 90kg/hm2 were different but higher than CK.In all,the WRA significantly increased soil moisture,leaf water potential,photosynthetic rate,transpiration rate and leaf water use efficiency and its suitable or recommended dosage was 60kg/hm2.
2010, Vol. 8 
