Study On The Effects Of Sod-culture And AMF To Early Pear

The genus Pyrus , a member of the Pomoideae of Rosaceae. Pyrus is native to Europe, Asia, and Africa. It is distributed widely in China. The yield of pear in our country is about 1, 0120, 000 tons in 2004, which amounts to 50 percent of the whole world yield. The industry of pear plays an important role in the rural economics. But the problem of low yield, low quality and low efficiency have not been solved for a long time.Mycorrhizae are symbiotic association between plant roots and certain soil fungi. Absolutely major plants can form the mycorrhiza structure in the natural condition. The AMF can promote the absorption of nutrient, accelerate nutrient cycling in the ecosystem, and protect host plants against environmental stress to promote the growth of plants. The Pyrus plants have AMF, but the rate of infection is very low. Sod-culture can promote AMF forming and improve the rate of AMF infection to the roots. In the production of early pear, the utilization of AMF can improve the physical and chemical quality of soil, enhance the utilization ratio of fertilizer, increase the quality of fruits, decrease the cost of production and optimize pear industry.In order to protect environment, save labour and produce fruits without pollution, many countries have widely used sod-culture cultivation in the orchard cultivation system in the early time and have done a series of researches. However these researches mainly focus on the static state of the environmental control. It is rarely reported on the relationship between AMF and other biome. Sod-culture can promote AMF formation and enhance its infection rate. It is rarely reported on the researches that AMF affects the growth of early pear in the system of sod-culture and that sod-culture and AMF affect the growth of early pear. The experiments were carried out to study the efficiency of sod-culture and AMF infecting to early pear, the results indicated as follows:Experiment 1 Study on the effects of sod-culture on the environments of early pear orchardBy field experiment, the effects of seeding Trifolium repen L. and Lotus corniculatus L.