To explore the mutagenic effect of 60Co-γ rays on Chinese milk vetch and clarify the suitable irradiation dose for its utilization and growth,Chinese milk vetch plants were treated with different 60Co-γ-ray irradiation doses[0 (CK),300,500,and 700 Gy]to observe and compare the nutrient absorption characteristics,germination rate,and field growth conditions. The results showed that radiation treatment improves the N content during the flowering period,and Chinese milk vetch treated with 500 Gy had the highest N content. Under equal N input,compared with CK treatment,the incorporation amounts under 500 Gy treatment can be reduced by 2063 kg·hm−2,which is convenient for mechanical flipping operations. Compared with CK treatment,the number of seedlings produced by radiation treatment and many indicators of a tall plant height showed a downward trend. Fresh grass yield and seed yield were significantly reduced under treatment with a high irradiation dose of 700 Gy (P<0.05). The indicators of 500 Gy treatment were the closest to those of CK treatment,and the difference was relatively small. in summary,irradiation of Chinese milk vetch with 500 Gy 60Co-γ rays improved the nitrogen content per unit mass,which was convenient for light and simple overturning and utilization during the flowering period.
万方数据