采用循环营养液培养法,研究安徽省23个玉米主推品种苗期吸收与积累氮素的差异。结果表明,在常氮(5 mmol/L)和高氮(45 mmol/L)水平下,玉米茎叶干重、总干重、叶面积、茎叶氮累积量和整株氮累积量的变异系数分别在0.34~0.58和0.35~0.51;其中,常氮和高氮条件下茎叶干重、总干重、叶面积、茎叶氮累积量和整株氮累积量呈极显著正相关(P<0.01),其相关系数分别在0.529~0.998和0.821~0.995。以玉米茎叶干重、总干重、叶面积、茎叶氮累积量和整株氮累积量为玉米苗期氮高效评价指标,玉米苗期氮效率综合值在常氮和高氮水平下分别在0.199~1.113和0.216~1.128,其中,浚单20在常氮和高氮条件下的氮效率综合值均大于0.90,且聚类分析中均在第一类群,为氮高效品种。 Cyclic nutrient solution culture method was used to study the differences of nitrogen absorption and accumulation of 23 main maize varieties in Anhui Province. The results showed that the variation of dry weight, total dry weight, leaf area, accumulation of total nitrogen and total nitrogen in stems and leaves of maize under 5 mmol / L and 45 mmol / L nitrogen stress The coefficients were 0.34 ~ 0.58 and 0.35 ~ 0.51, respectively. Among them, dry weight, total dry weight, leaf area, accumulation of nitrogen and total nitrogen of plant stems and leaves were significantly and positively correlated with nitrogen and nitrogen (P <0.01). The correlation coefficients were 0.529 ~ 0.998 and 0.821 ~ 0.995, respectively. The dry matter weight, total dry weight, leaf area, nitrogen and nitrogen accumulation of whole plant and shoot of corn were used to evaluate the nitrogen efficiency of maize seedling. The integrated value of nitrogen efficiency at maize seedling was respectively at the level of normal nitrogen and high nitrogen 0.199 ~ 1.113 and 0.216 ~ 1.128. Among them, the integrated nitrogen efficiency of Xundan 20 was higher than 0.90 under the conditions of normal nitrogen and high nitrogen, and the first group in cluster analysis was nitrogen efficient variety.