A pot experiment was conducted to evaluate the effect of biochar( Produced from corn stover) at ap-plication rates of 0,1%,5%,10%(w/w)and different nitrogen levels of 0,400,800 kg/ha and their interactions on early seedling growth and related physiological characteristics of sorghum ( Sorghum bicolor( L. ) Moench) . The ex-perimental results showed that the growth of seedlings in the low EC soil was better than the high EC soil as a whole. 1% biochar was superior to the control for the seedling growth;however,5% and 10% biochar had inhibitory effect on sorghum seedling growth. There was no significant difference between two levels of 0,400,800 kg/ha level produced inhibition on the seedling growth. The effects of biochar application rates,N application levels and their in-teraction on seedling dry weight in both low EC and high EC soils were significant. The trend of influence of differ-ent treatments on sorghum seedling chlorophyll was consistent with the sorghum growth parameters change;the influ-ence of different treatments on the plant reducing sugar was mixed. Nitrate content of sorghum was significantly posi-tively related to the level of nitrogen fertilizer and negatively correlated with biochar dosage. This study indicated that low biochar application rate(1%) could stimulate seed germination and early seedling growth,higher biochar application rate(5% and 10%) and higher N application level(800 kg/ha) could inhibit seedling growth. Nitrate content in seedlings was decline with biochar rate increase,and increase with N level enhance.%采用盆栽试验,研究了不同生物炭用量(0,1%,5%,10%(w/w)和不同氮肥水平(0,400,800 kg/hm2)及其交互效应对高粱( Sorghum bicolor( L.) Moench)苗期生长及有关生理特性的影响。结果表明,EC值低的土壤植株生长状况整体要优于EC值高的土壤；1%生物炭对作物生长略优于0处理,而5%和10%生物炭对高粱苗期生长具有抑制作用；不施氮肥与施400 kg/hm2氮肥间无显著差异,800 kg/hm2氮肥水平对植株生长产生抑制效应；生物炭用量、施氮量及其交互效应对2种土壤植株干质量均有显著影响；叶绿素的表现与其生长状况表现基本一致；还原糖含量受生物炭和氮肥影响表现不一；硝酸盐含量与氮肥水平呈显著正相关,与生物炭用量呈负相关。研究表明,低量生物炭(1%)有利于高粱种子发芽和幼苗生长,高量生物炭(5%和10%)和高氮水平(800 kg/hm2)在一定程度上抑制了高粱幼苗的生长；植株硝酸盐含量随生物炭施用量增加而相应减少,随氮肥水平提高而相应增加。
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