淹水大豆的生长与固氮研究

试验于1989年7月至10月在泰国清迈大学农学院多熟制研究中心的农业试验场进行。在淹水栽培与常规栽培条件下,对二个大豆品种SJ5和NW1的生长与产量、根瘤生长与固氮率和固氮量及其对增施每公顷50kg氮素肥料的反应进行测定。结果表明,淹水能促进根瘤生长,增加固氮率、比常规栽培法多固定氮素44％以上。但是淹水栽培法对干物质和产量的增加并不显著。增施氮肥能防止淹水初期的植株落黄现象,但抑制根瘤生长和固氮。

THE RESEARCH ON SOYBEAN CROWTH AND NITROGEN FIXATION UNDER WATER SATURATED SOIL CULTURE

Two soybean vaireties, SJ5 and NW1, were cultivated under water saturated soil culture (SSC) method and conventional irrigation (CI) method in the experimental farm, Multiple Cropping Center of Ching Mai University. Thailand , from July to October in 1989. Soybean growth, yield, nodulation and nitrogen fixation affected by the application of 50 kg N/ha and non - application of N under SSC were measured and compared. The results show that SSC increased nodulation and nitrogen fixation. The amount of nitrogen fixed in SSC increased 44% over that of CI. However, there were no significant effect of SSC on the increase of dry matter and yield. The application of nitrogen fertilizer prevented plant nitrogen shortage after water was imposed, but it suppressed nodulation and nitrogen fixation.