Abstract: In order to identify the relationship of Fertilizer and Irrigation on oat production in dry area． adopt the split-plot design，Study of different treatment combinations of water and phosphorus to photosynthetic characteristics of oats and water use efficiency and the impact of changes in field． The results showed that; water chlorophyll content among treatments significant differences in the jointing stage， the rest period is not obvious， the time difference between the gradient of fertilizer significantly． Plant WUE significantly with the moisture gradient， the gradient did not change significantly with the fertilizer， the net photosynthetic rate increased with the increase of moisture gradient． Transpiration rate increased with the increase of moisture gradient increased，W₂P₂handle the largest WUE，W₂P₁the second． Feng Yu season phosphorus fertilizer on growth of oat plants on the role of photosynthetic efficiency significantly． WUE benefits to water two most prominent low-level WUE than high P treatment． Significant difference between different treatments，biomass W1P3 ，W₂P₄，W₃P₄deal with the highest yield，W₃P₄W₂P₄The yield increased 5% more than W1P4 by 29%． Grain yield W₁P₂，W₂P₂，W₃P₂handling the highest yield，W₃P₂W₂P₂The yield increased 6% more than W₁P₂51． 8% increase． Biological and grain yield at the maximum of three water treatments，P fertilizer 90 kg /ha and 30 kg /ha department appears．

Key words: Oats, Coupling, Photosynthetic characteristics, WUE, Yield

CLC Number: 

• S143． 1

• S512． 6