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紫云英是我国水稻地区的主要绿肥,也是发展牧畜业的优良饲料。研究提高紫云英产量和固氮量是提高农业生产一项重要措施。影响紫云英产量和固氮量因素很多,主要是紫云英品种和它共生的根瘤菌。此外环境条件如气候、土壤、肥料等也要影响紫云英和根瘤菌的生长。根据一些研究报导,豆科植物的固氮量与共生的根瘤菌中固氮酶的活性有一定的关系。如在不同时期测定根瘤中固氮酶的活性,还可以推算出固氮量。因此选择固
Astragalus is the main green manure in China’s rice region and is also an excellent feed for the development of animal husbandry. Research to improve the yield and nitrogen fixation is an important measure to improve agricultural production. There are many factors influencing the yield and nitrogen fixation of Astragalus sinicus, mainly the varieties of Astragalus sinicus and its symbiotic rhizobia. In addition, environmental conditions such as climate, soil, fertilizers, etc. also affect the growth of Astragalus and Rhizobia. According to some reports, the amount of nitrogen fixation in legumes is related to the activity of nitrogenase in symbiotic rhizobia. For example, the activity of nitrogenase in nodules can be determined at different periods, and the amount of nitrogen fixation can also be deduced. So choose solid