不同时期硒肥喷施浓度对马铃薯产量及品质的影响OA

In this study,the potato variety'Qingshu-9'was used as the material,and different con-centrations of water-soluble inorganic selenium fertilizer(S1:3.0 g/L,S2:4.5 g/L,S3:6.0 g/L and S4:7.5 g/L)were applied as foliar sprays at the seedling stage(M)and tuber expansion stage(P),and water was sprayed as the control(CK)to explore their effects on tuber selenium accumulation,yield and quality.The results showed that spraying selenium fertilizer at P stage could significantly in-crease the yield by 9.53％compared with at M stage,and the yield increase effect was the best when the concentration of selenium fertilizer was 6.3 g/L.Spraying at the P stage could significantly in-crease the selenium content of tubers,up to 109.74 μg/kg(spraying concentration 10.29 g/L);spra-ying at P stage could also simultaneously optimize the nutritional quality of tubers.The contents of vi-tamin C,crude protein and starch in 6.0 g/L selenium fertilizer treatment were significantly increased by 16.06％,12.54％and 11.37％compared with CK(P＜0.05),while reducing sugar content de-creased.In summary,spraying 6.0-6.3 g/L selenium fertilizer at the tuber bulking stage enhances yield,selenium content,and nutritional quality.