采用营养液培养方法,研究了不同形态氮素供应（尿素、硝态氮、铵态氮、硝酸铵）对玉米幼苗生物量和氮素累积的影响。结果表明，登海605和鲁单981地上部植株干重均表现为：硝酸钙>硝酸铵>尿素>硫酸铵。两品种根系干重在硝酸钙、硝酸铵和尿素处理下均无显著差异，但均高于硫酸铵处理下的根系干重。相反，两个品种地上部植株氮浓度和叶片SPAD值均表现为：硝酸钙 (NH4)2SO4. The root dry weight of the two maize hybrid lines was significantly lower with the threatment of (NH4)2SO4 supply compared with the other three N forms,where the root dry weight was not significantly different. The shoot N concentration and leaf SPAD values of the two maize hybrid lines were in the order: Ca (NO3)2 < NH4NO3 < Urea-N < (NH4)2SO4. The shoot N accumulation of Denghai 605 tended to decrease with the treatment orders of Ca (NO3)2, NH4NO3, Urea-N and (NH4)2SO4 while that of Ludan981 was not affced by different N forms. These results suggested that compared with the other three N forms, the treatment of NO3-N supply signficantly incresed the internal N efficency and further improved the dry weight accumulation, but resulted in a N dilution effect of maize seedlings.
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