http:/www.paper.edu.cn - 1 -1 1 2112 11300252110161 2email:guochen_lihotmail.com - 1 1992122247/1931200332003 World Water Development Report143020252/32 2140 6003203016175070008000800090004,5 2 12001018301620020657 http:/www.paper.edu.cn - 2 - 1999CO290%80 3 (090cm)6080 3.1 http:/www.paper.edu.cn - 3 -Cohen S5Jones H G678 RGB9 3.2 1 1941Kramer P J1961Kramer1011,12 3.3 Gs CO2feed-forward mannerfeedback manner113early warning systemSchulze14Negev111GsGs15 3.4 Pn http:/www.paper.edu.cn - 4 -Pn11PnPn46%55%55%64%64%65%16 3.5 ET 99%CWSICrop Water Stress IndexFAO1718 1GsPnET 3.6 1920 3.7 Namken L N21 (1969)cburney T22 (1984) 3.8 Idso231981CWSIIdsoTc- TaV PDLower baselineTc-TaTc-TaIdsoUp baselineJackson241982http:/www.paper.edu.cn - 5 -IdsoMoran251994WDI Water Def icit Index261986 JacksonCWSI27(1997) 282002 CWSICWSI 3.9 291993199530 4 CWSIhttp:/www.paper.edu.cn - 6 -311998Kurata, K.321990Center, B.331997Al-Faraj, A.342000-CWSI-CWSICWSI 1 http:/www.un.org/depts/dhl/dhlchi/water. 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Trans. ASAE, 1997, 40(3): 815821. 34 Al-Faraj, A., Meyer, G.E., Schade, G.E., Horst, G.L. Dynamic analysis of moisture stress in tall fescue using canopy temperature, irradiation and vapor deficitJ. Trans. ASAE, 2000.43 (1): 101109. Present Situation and Development of Technology of Agricultural Water-saving Li Guochen1,2, Ma Chenglin1, Yu Haiye1, Liu Dehui1,Wang Rui1 1.College of Biological and Agricultural Engineering, Jilin University, Changchun 130025; 2.College of Engineering, Shenyang Agricultural University, Shenyang 110161 1. Abstract Technology of water-saving has been an important method of decreasing crop producing cost and improving benefit. This paper presented the water resource pressuring situation, analyzed three main section in water-saving, and particularly discussed the method of diagnosing crop water stress. Leaf water potential, stomatal conduction and leaf transpiration are the standard of diagnosing crop water stress, but can not realtime controlling irrigation. Furtheremore, the paper discussed that the trend of the technology for detecting plant water stress and measurement of decision-making for irrigation. Keywords: water-saving; water stress; present situation. 1968CAD/CAM - This document was created with Win2PDF available at http:/www.daneprairie.com.The unregistered version of Win2PDF is for evaluation or non-commercial use only.