High-energy composite peptide selenoprotein nutrient solutions, preparation methods and applications thereof enable crops to access selenoprotein nutrients. The nutrient solution includes selenium-containing materials, proteins, minerals, vitamins and natural energy ores, etc. Through protein enzymatic treatment, synthesis of peptide selenoprotein complex, energy treatment, complexation reaction and fortification, etc., the high-energy composite peptide selenoprotein nutrient solution is prepared, and can be widely used in the development of various kinds of selenium-rich agricultural products (including various kinds of grain crops, vegetables, fruits, fungi, wild plants, sea foods, animal meats, herbs, etc.). The mother liquor of high-energy composite peptide selenoprotein nutrient solution is diluted with water by 6000 to 8000 times; in the different growing period of crops, irrigate and spray the nutrient solution to the roots and foliages of crops, generally spraying 3-6 times, to get the selenium-rich agricultural products that can meet the standards.

High-energy composite peptide selenoprotein nutrient solutions, preparation methods and applications thereof enable crops to access selenoprotein nutrients. The nutrient solution includes selenium-containing materials, proteins, minerals, vitamins and natural energy ores, etc. Through protein enzymatic treatment, synthesis of peptide selenoprotein complex, energy treatment, complexation reaction and fortification, etc., the high-energy composite peptide selenoprotein nutrient solution is prepared, and can be widely used in the development of various kinds of selenium-rich agricultural products (including various kinds of grain crops, vegetables, fruits, fungi, wild plants, sea foods, animal meats, herbs, etc.). The mother liquor of high-energy composite peptide selenoprotein nutrient solution is diluted with water by 6000 to 8000 times; in the different growing period of crops, irrigate and spray the nutrient solution to the roots and foliages of crops, generally spraying 3-6 times, to get the selenium-rich agricultural products that can meet the standards.

A nematicidal fertilizer composition comprising one or more amino acids and one or more micronutrient compounds. A method of controlling nematodes at a locus is also provided. The method comprises applying to the locus one or more amino acids and one or more micronutrient compounds.

A nematicidal fertilizer composition comprising one or more amino acids and one or more micronutrient compounds. A method of controlling nematodes at a locus is also provided. The method comprises applying to the locus one or more amino acids and one or more micronutrient compounds.

The invention encompasses resinate formulations comprising an agricultural active ingredient and an ion exchange resin, wherein the agricultural active ingredient is imbibed upon the ion exchange resin; and methods of treating an agricultural surface. The invention also encompasses methods of manufacturing an agricultural formulation comprising a resinate, comprising: providing an agricultural active ingredient and an ion exchange resin; and mixing the agricultural active ingredient and the ion exchange resin to imbibe the agricultural active ingredient upon the ion exchange resin, thereby forming the resinate.

A controlled-release fertilizer includes oxidized glutathione and a release control agent, and a method produces the controlled-release fertilizer.

A plant metabolism promoting composition for promoting metabolic processes in plants includes an L-amino acid, or a salt or a derivative thereof, having a chemical formula of HO.sub.2CCH(NH.sub.2)CH.sub.2CH.sub.2CONHR, wherein R is an alkyl or an alkenyl. An amount of the composition applied to one or both of a seed and a plant is sufficient to augment one or more of: i. growth of a plant growing from the seed or growth of the plant, ii. health of a plant growing from the seed or health of the plant, iii. quality of yield from a plant growing from the seed or quality of yield from the plant, and iv. quantity of yield from a plant growing from the seed or quantity of yield from the plant.

A method for producing an amino acid liquid fertilizer from waste feathers includes: acquiring an enzymatic hydrolysate by performing enzymolysis on feather powder with a complex enzyme; adding acid protease to the enzymatic hydrolysate for enzymolysis; and acquiring the amino acid liquid fertilizer by performing enzyme inactivation on a filtrate acquired by performing filtering after enzymolysis is completed, wherein the complex enzyme includes keratinase and amino acid peptidase. By adopting this method, the enzymolysis rate of the feathers reaches 80% or above and the prepared amino acid liquid fertilizer contains various kinds of amino acids (17 amino acids); and the content of the amino acid can reach 10.12% (by mass fraction) or above and the content of small peptide reaches 9.39% (by mass fraction), which reach the Chinese standard of the amino acid liquid fertilizers without concentration. Thus, the environmental-friendly amino acid liquid fertilizer can be prepared.

A method for producing an amino acid liquid fertilizer from waste feathers includes: acquiring an enzymatic hydrolysate by performing enzymolysis on feather powder with a complex enzyme; adding acid protease to the enzymatic hydrolysate for enzymolysis; and acquiring the amino acid liquid fertilizer by performing enzyme inactivation on a filtrate acquired by performing filtering after enzymolysis is completed, wherein the complex enzyme includes keratinase and amino acid peptidase. By adopting this method, the enzymolysis rate of the feathers reaches 80% or above and the prepared amino acid liquid fertilizer contains various kinds of amino acids (17 amino acids); and the content of the amino acid can reach 10.12% (by mass fraction) or above and the content of small peptide reaches 9.39% (by mass fraction), which reach the Chinese standard of the amino acid liquid fertilizers without concentration. Thus, the environmental-friendly amino acid liquid fertilizer can be prepared.

The present application provides an application of quercetin in a plant senescence accelerator, which belongs to the field of plant senescence accelerators and its application, and can prepare a plant senescence accelerator by using quercetin and apply the accelerator in practical production to accelerate the senescence process of plant particularly crop leaves. The quercetin plant senescence accelerator is prepared by mixing a quercetin mother solution with a 1/2 MS solution of 2-(N-morpholino)ethanesulfonic. In the present application, by adopting directly spraying method, the senescence process of plant leaves can be accelerated, and will not cause additional adverse reactions to plants.