Cultivation method of organic selenium-enriched mulberry

The invention belongs to the fruit tree cultivation field and particularly relates to a cultivation method of organic selenium-enriched mulberry. The cultivation method of the selenium-enriched mulberry comprises applying nano selenium fertilizer in different growing periods of mulberry trees, wherein the fertilizer applying periods can be divided into three phases of phase one, applying the nano selenium fertilizer to the mulberry trees at 30-50 grams per tree in the growing period of the mulberry trees in March; phase two, applying the nano selenium fertilizer to the mulberry trees at 50-60 grams per tree in late April; phase tree, after mulberry harvest, applying the nano selenium fertilizer to the mulberry trees at 50-60 grams per tree in the periods from early June to late August and from late August to early October. According to the cultivation method of the organic selenium-enriched mulberry, by applying the nano selenium fertilizer in different growing periods of the mulberry trees, most of harvested mulberry products have a selenium content of between 28.85 micrograms per hundred grams and 48.74 micrograms per hundred grams and the ratio of organic selenium is more than 80%.