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生物固氮是土壤氮素养分的主要来源,是弥补氮肥不足的重要措施。联合固氮是继自生固氮、共生固氮之后,70年代发现的新的固氮领域。其特征是某些固氮微生物与禾本科植物根系联合共生,但在形态上没有形成特异的共生构造,联合固氮为禾本科植物氮素来源开辟了新的途径。据巴西、美国、印度、以色列、埃及等国家试验,玉米、高粱、谷子、小麦等作物接种固氮螺菌(A—spirlum),植株干物
Biological nitrogen fixation is the main source of soil nitrogen nutrients, is an important measure to make up for lack of nitrogen fertilizer. Combined nitrogen fixation is a new field of nitrogen fixation discovered in the 1970s, following autotrophic nitrogen fixation and symbiotic nitrogen fixation. It is characterized by the symbiosis of some nitrogen-fixing microorganisms with the root system of gramineous plants, but no specific symbiotic structure is formed in the morphology. Combined nitrogen fixation opens up a new way for the nitrogen sources of gramineous plants. According to the national trials of Brazil, the United States, India, Israel and Egypt, corn, sorghum, millet, wheat and other crops were inoculated with A-spirlum,