Preparation Method for Humic Acid Type Fruit Bagging-free Film Agent and Application thereof

A humic acid type fruit bagging-free film agent, comprising:

• an agent A and an agent B, wherein the agent A is configured to be sprayed onto a fruit surface, and then the agent B is configured to be sprayed immediately after the agent A is sprayed to form a humic acid type fruit bagging-free film on the fruit surface;
• wherein the agent A is prepared by the following steps:
• (1) dissolving sodium alginate into water, stifling evenly, then adding TWEEN-20 and SPAN-20, and stifling for mixing to form a sodium alginate solution;
• wherein a mass ratio of the sodium alginate:
• the water:
• the TWEEN-20:
• the SPAN-20 is (5˜8):
• (60˜65):
• (0.5˜0.8):
• (0.5˜0.8);
• (2) dissolving humic acid potassium into water completely, adding glycerin, then mixing completely and evenly to form a humic acid potassium solution;
• wherein a mass ratio of the humic acid potassium:
• the water:
• the glycerin is (0.3˜0.5):
• (35˜40):
• (1˜1.2);
• and
• (3) stifling the sodium alginate solution prepared by the step (1) and the humic acid potassium solution prepared by the step (2) fully until they become a homogeneous system, thereby forming the agent A;
• wherein a volume ratio of the sodium alginate solution prepared in the step (1) to the humic acid potassium solution prepared in the step (2) is 1:1;
• wherein the agent B is a calcium chloride solution.