不同熟期大豆品种吸收和利用氮肥的差异

盆栽条件下，应用（１５）Ｎ示踪技术，研究了不同施Ｎ水平（每公斤土施用０．１克、０．２克氮）下，不同熟期大豆品种吸收、利用氮肥的差异。结果表明，植株全氮积累量：中晚熟品种＞早中熟品种＞早熟品种；施氮对增加各品种植株氮的积累有明显影响，其大小顺序为早中熟品种＞早熟品种＞中晚熟品种，而且增产作用显著，增产率分别为Ｎ１：２４．１％－４０．７％和Ｎ２１８．５％－６１．９％；植株中肥料氮占总氮的比例分别为２３．５％－４３．６％和５０．５％－６８．２％．其大小依次为早熟品种＞早中熟品种＞中晚熟品种；至成熟期，６８．８％－８１．８％肥料Ｎ转移到籽粒中，早熟和早中熟品种高于中晚品种．

DEFFERENCES OF ABSORPTION AND UTILIZATION OF NITROGEN AMONG SOYBEAN CULTIVARS

With the use of 15N tracing technique, a pot experiment on the differences of absorption and utilization of nitrogen among different maturation types of soybean cultivars was conducted under the application of 0.1g or 0.2g nitrogen each 1 kilogram soil. The results showed as follows: amounts of N accumulation in soybean plants were medium-late>early-medium>early cultivars. The application of N not only influenced the N acumulation of varieties(early-medium>early>medium-late cultivars),also increased remarkably the yield with 24.1%-40.7% (N1) and 18.5-61.9% (N2). Of the total N in plant, 23.5%-43.6% (N1) and 50.5%-68.2% (N2) came from fertilizer with the range of early >early-medium>medium-late cultivars. 68.8%-81.8% of fertilizer N absorbed transferred to seeds.