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E-mail address: xiongyc@lzu.edu. cn (Y.-F. Wang). 0981-9428/$-see front matter©2006 ... adding 10%PEG which is equivalent to an osmotic potential of-0.40 MPa, into the full ...

... Xu Education Ministry Key Laboratory of Arid and Grassland Ecology, School of Life Science, Lanzhou University, Gansu Province, 730000, Lanzhou, China E-mail: fmli@lzu.edu.cn ...

The two indices, financial NPV and capital recovery period show that in order to increase crop yield and economic return it is important to make full use of all existing ...