Animal Source Amino Acids VS Plant Source Amino Acids

Amino acid fertilizers are functional fertilizers made from animal and plant proteins. Through chemical hydrolysis, enzymatic hydrolysis, or microbial fermentation, large protein molecules are broken down into small amino acids and oligopeptides that can be directly absorbed and utilized by plants. Their core value lies not only in supplementing nitrogen nutrition but also in acting as a highly effective biostimulant. Classified by raw material source, amino acid fertilizers mainly include animal-derived amino acid fertilizers, plant-derived amino acid fertilizers, and microbial/fermentation-based amino acid fertilizers. Today, we will mainly discuss the two most important types: animal-derived amino acid fertilizers and plant-derived amino acid fertilizers.

What are the advantages of animal-derived amino acids for plants?

Animal-derived amino acids (such as those extracted from fishmeal, bone meal, feather meal, and blood) are typically applied in agriculture as “amino acid fertilizers” or “amino acid foliar fertilizers.” Their advantages for plants stem primarily from their unique form and comprehensive functions, offering distinct benefits compared to chemical nitrogen fertilizers.

The following are their main advantages:

1. Direct Absorption and Rapid Effect

No Conversion Required: Chemical nitrogen fertilizers (such as urea and ammonium nitrogen) require conversion into nitrates or amino acids by soil microorganisms or the plant itself before they can be utilized by plants. Animal-derived amino acids, however, are already small-molecule peptides or free amino acids, which can be directly absorbed by plant leaves and roots very quickly, especially when plants are weak, have damaged roots, or are under environmental stress (such as low temperatures).

Energy Saving Effect: Plants do not need to expend a large amount of energy on conversion, essentially receiving “nutrition right to their mouths,” allowing them to use more energy for growth and resistance to adversity.

2. Enhanced Stress Resistance

Strengthened Resistance: Some amino acids (such as proline and glycine) are precursors or signaling substances for plant stress resistance. Exogenous supplementation helps plants better cope with stresses such as drought, salinity, low temperature, high temperature, and pesticide damage.

Chelation Carrier Role: Amino acids are excellent natural chelating agents, capable of binding with micronutrients (calcium, magnesium, iron, zinc, etc.) to form stable “amino acid-micronutrient” chelates. This form of micronutrient is more easily absorbed and transported by plants, effectively preventing and correcting nutrient deficiencies.

3. Improving Crop Quality

Enhancing Flavor and Nutrition: Amino acids are the foundation for protein and flavor synthesis. Supplementing with exogenous amino acids helps increase the sugar, vitamin, and protein content in fruits, improving taste, color, and aroma.

Reducing Nitrate Accumulation: By directly providing organic nitrogen, it reduces the excessive absorption of nitrates from the soil by plants, thereby lowering the nitrate content in vegetables (especially leafy greens), making the product safer and healthier.

4. Promoting Soil Health and Ecological Balance

Enriching Soil: Animal-derived amino acids are organic matter that promotes the reproduction of beneficial microorganisms in the soil, improving the soil microecology.

Reduced Burden: Compared to the direct use of unfermented animal manure, amino acid fertilizers extracted through industrial hydrolysis are more thoroughly harmless, avoiding the risks of parasites, pathogens, and antibiotic residues, and reducing the possibility of root burn.

5. Multifunctional Physiological Regulatory Roles

Precursors of Endogenous Hormones: Some amino acids are precursors to plant endogenous hormones. For example:

• Tryptophan → Can be converted into auxin (IAA), promoting root growth and cell division.

• Methionine → A precursor to ethylene and abscisic acid synthesis, involved in fruit ripening and stress resistance responses.

• Arginine, Glutamic Acid → Affect flowering and fruit setting.

Enhanced Photosynthesis: Glycine, glutamic acid, etc., can increase chlorophyll content and improve photosynthetic efficiency.

Comparison with Plant-Derived Amino Acid Fertilizers

Animal-derived amino acids (especially hydrolyzed animal protein) generally have a more comprehensive range of amino acids (containing all 18 protein amino acids), particularly high levels of proline, glycine, and hydroxyproline, which have strong physiological regulatory functions in plants. Plant-derived amino acids (such as those extracted from soybeans and seaweed) may have advantages in certain specific amino acids or natural active substances (such as alginic acid). Both have their advantages, but animal-derived amino acids often excel in providing comprehensive and balanced amino acid nutrition.

Characteristic Dimensions	Animal Source Amino Acid Fertilizer	Plant SourceAmino Acid Fertilizer
Main Raw Materials	Animal hair (feathers), hides, bones, blood, fish protein, etc.	Plant residues such as soybean meal, corn steep liquor, and sesame cake.
Production Process	Typically uses strong acid/alkali hydrolysis or enzymatic hydrolysis. The process requires high precision to break down tough keratin (such as feathers).	Mostly uses enzymatic hydrolysis or microbial fermentation under relatively mild conditions.
Amino Acid Characteristics	Complete range, containing all 18 protein amino acids.High in proline, glycine, hydroxyproline, and cysteine.	Relatively concentrated in types, with high content of glutamic acid, aspartic acid, and arginine.
Core Functional Advantages	1. Strong stress regulation function (due to rich proline, etc.). 2. Promotes root development (high in tryptophan). 3. Strong ability to chelate trace elements.	1. Promotes photosynthesis and growth (high in glutamic acid). 2. High safety and good biocompatibility. 3. Contains natural plant active substances (alginic acid, etc.).
Main Efficacy Focus	“Stress Resistance” + “Repair” + “Quality Improvement” (Protecting flowers and fruits, resisting cold and drought, restoring tree vigor)	“Growth Promotion” + “Greening” + “Safety” (Promoting growth in seedlings, thickening and greening leaves, short safe period)
Potential Disadvantages	1. Diverse raw material sources; inferior products may contain heavy metals/salts. 2. Potentially strong odor. 3. Usually higher cost.	1. The amino acid profile of a single plant source may not be comprehensive enough. 2. Incomplete fermentation may contain plant toxins. 3. Relatively weak ability to alleviate extreme stress.
Typical Examples/Applications	Fish protein fertilizer, hydrolyzed amino acids from animal hair.	Soybean meal amino acid fertilizer.

1. Differences in Raw Materials and Components: The Root of Functional Focus

Animal-derived: Raw materials are rich in animal protein, and their amino acid composition is highly correlated with the precursors of plant endogenous hormone synthesis.

• Tryptophan → Precursor to auxin (IAA), powerfully promotes root growth.
• Proline/Glycine → Key substances for plant stress resistance, regulate cell osmotic pressure, and enhance drought, cold, and salt tolerance.
• Sulfur-containing amino acids (cysteine, etc.) → Participate in protein synthesis, beneficial to fruit flavor and quality.

Plant-derived: Raw materials originate from plant tissues, and their amino acid profile is closer to the plant’s own needs.

• Glutamic acid/Aspartic acid → Participate in chlorophyll synthesis and nitrogen metabolism, rapidly improve green color, and enhance photosynthesis.
• Unique substances from seaweed: In addition to amino acids, they are rich in seaweed polysaccharides, betaine, and natural growth hormones (such as cytokinins). These are powerful biostimulants that can comprehensively regulate plant growth and improve immunity.

2. Focus of Effect: When to Use Which? Situations where animal-derived amino acids are preferred

• During stress management: After frost damage, drought, waterlogging, or pesticide damage, they are used to quickly repair damaged cells and restore tree vigor.

• Critical growth turning points: During flower bud differentiation and fruit expansion/coloring stages, their regulatory and nutritional functions are utilized to protect flowers and fruits, improve quality, and increase sweetness.

• Root system maintenance period: After planting or when the root system is weak, they stimulate the sprouting of new roots.

Situations where plant-derived amino acids are preferred:

• Vegetative growth period: During the seedling stage and early seedling growth, when rapid expansion of leaf area is needed to promote stem and leaf growth.

• When rapid foliage replenishment is needed: When leaves are yellowing and photosynthetic efficiency is low, they provide rapid relief.

Below is Dora AminoPro85, an animal-derived amino acid product launched by our Dora team, which has received widespread acclaim.