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The experiment studied the effect of Arbuscular mycorrhizal fungi (AMF) function in the grasses and legumes mixture. A mixed sowing experiment of Medicago varia Martin. cv. Caoyuan No.3 and Agropyron mongolicum Keng. cv. Mengnong No. 1 was carried out on four years grassland. The paper researched AMF infection, soil nitrogen and phosphorus nutrients situation. The results showed that the total yield of mixed sowing was 24.3% higher than that of monoculture alfalfa and 46.9% higher than that of monoculture ice grass, and the plant height of mixed sowing ice grass was higher than that of monoculture ice grass. The pH value of rhizosphere soil of mixed grassland was significantly lower than that of non-rhizosphere soil. The vesicle infection rate of mixed sowing ice grass was significantly higher than that of monoculture ice grass. The total nitrogen of mixed sowing soil was higher than that of alfalfa monoculture or ice grass monoculture. The available P content in rhizosphere soil was higher than that in non-rhizosphere soil. The experiment indicates that the soil yield can be increased with the increase of Arbuscular fungi infection rate, the increase of nitrogen and phosphorus content in rhizosphere soil, and the decrease of soil pH value. [ABSTRACT FROM AUTHOR]

The experiment was to investigate the effect of arbuscular mycorrhizal fungus (AMF) inoculation under mixed saline alkali on the root configuration of alfalfa. In the experiment, Rhizophagus intraradices in AMF were inoculated with Medicago sativa variety WL168HQ, so that the two formed a plant-mycorrhizal joint repair system. Based on different salinity-alkali gradients, greenhouse potting experiments were carried out to study alfalfa root configurations with and without AMF inoculation under these conditions. The results showed that the total root length, bifurcation number, root tip number, surface area and volume of alfalfa after AMF inoculation were increased compared with the control group under the saline-free alkali (CK) treatment, and the total root length and bifurcation number were significantly different, while the average root diameter of alfalfa unvaccinated with AMF increased by 44.53% compared with the inoculation treatment. Salt stress, AMF and salt stress had significant effects on all root indexes of alfalfa, and the effect of salt stress on the average diameter, number of bifurcations, surface area and volume of alfalfa roots were more significant after inoculation with AMF under mixed saline conditions than on alkali stress. The experiment indicates that AMF vaccination is beneficial to the growth of alfalfa roots, helps alfalfa resist and adapt to salinity stress, thereby improving alfalfa quality and improving and treating land with mild saline. [ABSTRACT FROM AUTHOR]