Starch-based composite seed coating agent and preparation method thereof

Abstract

The invention discloses a starch-based composite seed coating agent and a preparation method thereof and aims to solve the problems that common starch is poor in film formation property and easily lost through dissolution when being applied to a film forming agent; the requirements on the film formation property and the cohesiveness cannot be satisfied simultaneously when certain high-molecular film forming substance is used independently. The composite seed coating agent is divided into an inner layer and an outer layer, wherein the inner layer takes etherified starch as a base material, contains a bactericide, an insecticide, a plant growth inhibitor, a fertilizer and the like, and can be used for preventing diseases and insect pests of seeds to a certain extent; the outer layer takes the starch base a substrate; graft copolymerization of an acrylic acid monomer is triggered by free radicals to prepare a film layer and a water retaining layer; the film layer and the water retaining layer are good in cohesiveness and film formation property, can be used for protecting components of the inner layer from loss and also have water retention property and moisture retention property, so that the germination rate and planting percent of the seeds are increased. The starch-based composite seed coating agent disclosed by the invention is broad-spectrum and suitable for seed coatings of crops such as vegetables, flowers and grains.

Description

technical field

[0001] The invention belongs to the field of agriculture, and in particular relates to a seed coating agent and a preparation method thereof. Background technique

[0002] Seed coating refers to a "coat" that covers the outside of the seed with a layer of water-containing medicament and growth-promoting substances. Seed coating agents are different from previous seed soaking and seed dressing agents. Seed soaking and chemical seed dressing, the chemical on the surface of the seed will dissolve in water after sowing into the soil, and the drug effect will decrease or disappear soon. The seed coating agent can immediately form a solidified film on the seeds. After the seeds are put into the soil, they will swell with water and the seed coating will not be dissolved. With the germination, germination, emergence and growth of the seeds, the active ingredients on the seed coating will be gradually released. , and is absorbed by the root system to conduct various...

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