Abstract: In order to explore the relationship between barley yield and soil available nutrients N, P, K and obtain better Soil nutrient management, samples of soil in the plow layer (0-20cm) and barley during mature period (July and August) were collected from 8 counties in central Tibet(also named YijiangLianghe region) The content of available N, P, K and grain yields in the samples of soils and barley plants were analyzed The relationship between barley yield and soil available N, P, K was calculated The results showed that there was a significant positive correlation between barley yield and soil hydrolyzable N (P<0.01), and positive correlation between barley yield and available K (P<0.05) The results indicated that barley yield in central Tibet was depended mainly on hydrolyzable nitrogen in soil As a result, nitrogen was a significant limiting factor for the barley growth Adjusting the components of fertilizer and increasing nitrogen fertilizer could improve effectively soil nitrogen and barley yield The research results could provide references for soil nutrition management and barley yield improvement in central Tibet

Key words: Barley, Yield, Hydrolyzable N, Available P, Available K, Correlation analysis