In order to solve the adverse effects of application of traditional chemical fertilizers on the environment and the low efficiency of selenium absorption in crops, in this study, 6 application rates of photocarbon core fertilizer(0(CK), 600(G1), 750(G2), 900(G3), 1 050(G4), and 1 200(G5) kg/ha) were set in the experiment, the ability of a new organic fertilizer, photocarbon core fertilizer, to improve the nutrients of naturally selenium-rich soil and enhance the absorption and transport of selenium in highland barley was evaluated without the addition of exogenous selenium, so as to provide a theoretical basis for the efficient use of natural selenium-rich resources to produce green and safe selenium-rich agricultural products. The results showed that application of appropriate photocarbon core fertilizer could increase the contents of soil organic matter, total nitrogen, total phosphorus, total potassium, and available nutrients, the soil integrated fertility index(IFI) under G3 treatment reached the highest value of 1.88, and there was no significant difference in soil pH among all treatments. Application of photocarbon core fertilizer could significantly increase the contents of total selenium and available selenium in soil, and promote the activation of selenium in soil. Organic matter and alkali-hydrolyzed nitrogen were extremely significantly positively correlated with available selenium content. Application of photocarbon core fertilizer could increase the selenium content of highland barley organs,the content was in the order of root > leaf > stem > grain, the proportion of organic selenium in grain increased to 67.9%. The bioconcentration factor(BCF) value of selenium in all organs was in the order of root > leaf > stem > grain, and the leaf/stem value of TF was greater than 1, indicating that selenium was more easily transferred from stem to leaf, but there was no significant difference among the treatments, revealing that photocarbon core fertilizer had no significant effect on the transfer of selenium from leaf to grain. In conclusion, the best effect was achieved when the basal application rate of photocarbon core fertilizer was 900 kg/ha(G3), which could be used as a cultivation management measure in naturally selenium-rich soil.
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