Effects Of Edible Fugus Residue On Rice Grain Yield And Soil Fertility Under Reduction Of Chemical Fertilizer Application

Rice-edible fungus rotation system is a new agricultural regime and rapidlydeveloping. After rice harvest, the paddy field is arranged for edible fungus (black fungus,Auricularia auricula judae) cultivation, which uses mulberry sticks as the majorcomponent for culture medium. And the large amount of the residue, a waste after theedible fungus cultivation, can be returned to rice field for rice growth. The fungus residuewould cause serious environmental pollution and resource waste if it is not treatedproperly or reutilized. The residue is rich in nutrients and organic matter, which can be ahigh quality organic fertilizer. In present study, field experiments were conducted toexamine the rice yield response and to analyze the ecological, economic and socialbenefits of the rice-edible fungus rotation system while with fungus residue return to therice field. Conclusions are as follows:(1) Combined application of fungus residue and chemical fertilizers in ationincreased rice yield, but single residue application wass insufficient to meet rice growingdemand for nutrients so that resulted in grain yield reduction.(2) Residue application could significantly increase soil organic matter content andsoil labile organic carbon as well. Moreover, long-term residue application also reducedthe soil bulk density: it dropped from1.3g/cm3to1.1g/cm3after three consecutive yearsof the residue return.(3) Under the rice-edible fungus rotation system, the increase of farmers’ incomewas mainly attributed to the lowered cost of production and fruitful yield of black fungus.Proper recycle of the residue waste to the rice filed is not only an ideal measure to avoidits pollution to the environment and to save consumption of the chemical fertilizers, butmay also improve rice yield and soil sustainable use.