Degradable solid mulching film special for tobacco and preparation method of degradable solid mulching film

The invention discloses a degradable solid mulching film special for tobacco and a preparation method of the degradable solid mulching film. The degradable solid mulching film comprises the raw material components of humic acid, a binding, an activator, a cross-linking agent, glazed hollow beads and a soluble fertilizer. The preparation method comprises the following steps that: the humic acid is activated and modified by the activator to obtain a modified mixture; the cross-linking agent and the binding are added into the obtained modified mixture and the mixture is heated and stirred for cross-linking reaction; after the cross-linking reaction is completed, the glazed hollow beads and the soluble fertilizer are added into the reaction mixture and the mixture is stirred evenly to obtain raw powder; water is added into the raw powder and the mixture is stirred until the mixture is in gluey thick state and poured into a die; and after natural drying, the degradable solid mulching film is obtained. The preparation method has the advantages of simplicity, rapidness and low cost and is applicable to industrial production. The prepared degradable solid mulching film has heat preservation and water retention functions of the traditional mulching film, also has the function of improving soil, particularly has good degradability and more than 80% can be degraded in the growth period of tobacco. The materials after degradation can promote the middle-to-late growth of the tobacco and have the effects of enhancing the disease resistance of tobacco and improving the quality of tobacco leaves.