【摘要】 <正> 自从Dobereiner(1976)报道了带脂螺菌(Spirillum lipoferum)与玉米根系具有联合固氮作用以来,引起了国内外科学者广泛的注意。它的发现为非豆科作物固氮提出了一条新的途径。黑龙江省是全国主要春麦区,研究和探讨春小麦在黑龙江省土壤-气候条件下的联合固氮作用,对小麦施肥和育种都具有重要意义。1979年更多还原

【Abstract】 The results of investigation of associated nitrogen-fixing activity of spring wheat root system in 1979—1983 are as follows:a)The nitrogen-fixing activities of root system varied with different cultivars by 250—450 times. The content of soil organic mutter can increase the nitrogen-fixing activity of root systems. There was significant difference in nitrogen-fixing activities during the heading and flowering stages. Through sexual crossing, the nitrogen-fixing activities of some parents can be increased by 8—10 times. Hence, the nitrogen-fixing activities of root systems of parents and their progenios should be determined in the crossbreeding in order to select a high yielding combination of spring wheat and nitrogen-fixing bacteria.b)Azotobacter, Enterobacter and Micrococus are the major bacteria in the spring wheat root systems with nitrogen-fixing ability, the highest nitrogenase activity being with the first two. Generally, higher nitrogenase activity in associated nitrogen-fixing bacteria can be obtained from cultivars with higher nitrogenase activity in root systems.c)Under the climatic conditions of Heilongjiang Province the associated nitrogen fixation capacity of spring wheat is 0.7—1.4 jin N/mu/year.更多还原