A preparing method of a selenium fertilizer for root fertilization of yellow peach

A preparing method of a selenium fertilizer for root fertilization of yellow peach is provided. The method includes weighing corn straw, crushing the corn straw, then fully mixing the corn straw with animal manure, a sodium selenite solution having a concentration of 2%, vinasse and calcium hydrophosphate according to a weight ratio of 1:1:0.05:0.5:0.01, adding the mixed manure-straw mixture into a biogas digester, fermenting the mixture for 25-40 days, taking the fermented material out after fermentation, spreading and airing the fermented material in a shady and cool place for 2-3 days, and crushing the fermented material again. Yellow peach trees are fertilized with the fermented fertilizer in the beginning of May and the middle of August every year separately, wherein 3-10 kg of the fertilizer is applied for each tree in the beginning of May and 5-15 kg of the fertilizer is applied for each tree in the middle of August. The problem that yields and quality of yellow peach at present should be improved and