苗床施硒方式对水稻生长发育及籽粒富硒的影响OA北大核心CSTPCD

To study the effects of one-time application of slow-release selenium fertilizer in seedling on rice growth and grain selenium enrichment,and to explore a new simplified application method of selenium(Se)fertilizer.Nanjing 46 Ja-ponica rice was applied with a new type of coated slow-release Se fertilizer at seedling stage.The seedling quality,yield and grain selenium content were determined in the treatments of two Se fertilizer application methods(substrate soil mixed with Se fertilizer and substrate block spreading Se fertilizer),four Se fertilizer concentration levels(15,30,45,60 kg·hm-2)and no Se fertilizer control(CK).The results showed that:compared with CK,the seedling formation rate decreased with the in-crease of Se fertilizer application concentration,and the seedling formation rate of substrate block cultivation was signifi-cantly higher than that of substrate soil cultivation.After the application of Se fertilizer,the consolidation force decreased with the decrease of seedling formation rate,and the quality of other seedlings increased with the increase of Se fertilizer concentration.The accumulation of Se in seedlings under the two seedling rearing methods was significantly increased compared with CK,and the accumulation of Se in seedlings treated with 60 kg·hm-2 was 67.53％and 84.49％higher than that treated with 15 kg·hm-2.Compared with CK,the leakage rate of seedlings treated with Se fertilizer increased,and the yield decreased by 1.06％-16.27％and 1.35％-3.35％,respectively.Compared with CK,the content of Se in grains of two kinds of seedlings treated with Se fertilizer increased by 46.63％to 223.71％and 62.38％to 249.89％,re-spectively,and the maximum values were 127.09 and 139.50 μg·kg-1,respectively.Under the same concentration of Se fertilizer,the content of Se in grain of substrate block seedling rearing was higher than that of substrate soil seedling rearing.In this experiment,the application of Se fertilizer under the substrate block can achieve the enrichment of Se in the grain with ensured the normal seedling growth and stable yield,which is a feasible way to simplify the application of Se at seedling stage.