Abstract:

By searching for research papers published on China National Knowledge Infrastructure (CNKI) using keywords, based on monoculture of highland barley in the field, clear experimental sites, control and experimental groups with a repetition rate of ≥2 times, and clear records of fertilization types, seeding rate, years, altitude, annual average temperature, and annual precipitation standards, the articles were screened and the required data were extracted. Finally, 47 yield data containing 415 groups of highland barley fertilization and non-fertilization treatment conditions were adopted, and the effect size of fertilization on highland barley yield were determined using Meta-analysis method. The effects of experimental locations, sowing amounts, altitude, annual average temperature, and annual precipitation on heterogeneity of effect size were also studied to explore the effects of fertilization on highland barley yield in different environments. The results showed that fertilization increased the yield of highland barley in western China by 52.20%. Single application of nitrogen fertilizer, phosphorus fertilizer, and organic fertilizer increased the yield of highland barley by 29.69%, 34.99%, and 55.27%, respectively. The combined application of nitrogen phosphorus, nitrogen potassium, phosphorus potassium, and nitrogen phosphorus potassium, as well as the application of chemical fertilizers and organic fertilizers, increased the yield of highland barley by 58.41%, 69.89%, 25.86%, 60.00%, and 63.23%, respectively. According to heterogeneity testing, there was significant heterogeneity in the yield of highland barley. Without excluding the collinearity of factors, the experimental location, seeding rate, altitude, annual average temperature, and annual precipitation accounted for 18.98%, 15.13%, 24.86%, 28.14%, and 26.31% of the overall heterogeneity, respectively. Different experimental sites correspond to different environmental conditions, and reasonable fertilization and appropriate sowing rates are beneficial for increasing yield of highland barley.

Key words:

Highland barley, Fertilization, Yield,  , Meta-analysis, Heterogeneity