Fish protein, amino acids, humic acid, seaweed extract, complex sodium · naphthylacetic acid, microbial agents - full guide to differences, effects, and combinations

These six types of agricultural inputs belong to three core categories: organic nutrition, plant growth regulation, and microbial function. The core raw materials, mechanisms of action, functional focus, and usage scenarios vary greatly. Among them, fish protein, amino acids, humic acid, and seaweed essence belong to nutrient/biological stimulation fertilizers (supplementing nutrition and regulating growth), sodium naphthalene acetic acid is an artificially synthesized plant growth regulator (purely regulating growth), and microbial agents are microbial improvement preparations (improving soil and promoting microbial ecology).

1、 Fish protein (fish protein fertilizer, containing fish protein peptides/amino acids)

Core positioning: Fully nutritious organic water-soluble fertilizer, belonging to the "upgraded version" of amino acids, with more comprehensive nutrition.
Raw materials: deep sea fish/freshwater fish (such as cod and sardine), made by enzymolysis, fermentation or high-temperature hydrolysis, without chemical addition.
Core ingredients: small molecule fish protein peptides, free amino acids (18 types), trace elements such as calcium, magnesium, zinc, and iron, vitamins, fish protein polysaccharides, and a small amount of natural active substances.
Core functions:
① Comprehensively supplement crop nutrition and promote robust plant growth;
② Improve soil particle structure, increase soil organic matter, and enhance soil fertility;
③ Enhance crop stress resistance (cold resistance, drought resistance, resistance to minor diseases);
④ Promote fruit expansion, increase sweetness, improve taste and marketability.
Key features: Comprehensive nutrition, mild and slow fertilizer efficiency, not just amino acid supplementation, combining "nutrient supplementation+soil improvement+quality enhancement", suitable for long-term use, no residue.
Suitable scenarios for tomatoes: basal fertilizer combination, seedling growth promotion, and fruit quality improvement, especially suitable for land with poor soil quality and poor fruit quality.
2、 Amino acid (amino acid water-soluble fertilizer, divided into compound/single)

Core positioning: Quick acting small molecule nutrient fertilizer, a "basic nutrient unit" that crops can directly absorb.
Raw materials: Plant derived (soybean meal, rapeseed meal) or animal derived (hair, bone meal, fish waste), enzymatically hydrolyzed to produce compound amino acids (containing multiple amino acids, commonly used) and single amino acids (such as glycine, proline, targeted).
Core components: Free small molecule amino acids (core), small amounts of trace elements (mostly chelated and easily absorbed).
Core functions:
① Directly absorbed by crop roots and leaves, quickly replenishing nitrogen (amino acid containing nitrogen), alleviating nutrient deficiency yellowing;
② Promote the synthesis of enzymes in the body and accelerate metabolism;
③ Chelate trace elements in soil to improve fertilizer efficiency;
④ Mild improvement in stress resistance (rapid nutrient supplementation under adversity).
Key features: quick acting, highly targeted, only supplementing amino acid core nutrients, without the core function of improving soil, short duration of fertilizer effect.
Applicable scenarios for tomatoes: slow seedling growth during the seedling stage, flower preservation during the flowering period, rapid recovery from adversity (low temperature/drought), and emergency fertilization in case of nutrient deficiency and yellowing.
3、 Humic acid (humic acid fertilizer, with humic acid as the core active ingredient)

Core positioning: Soil conditioning fertilizer, with soil improvement as the core and nutrition as a supplement.
Raw materials: peat, brown coal, weathered coal, extracted and made into humic acid (with the highest activity), brown humic acid, and black humic acid. Potassium humate (water-soluble) is the most commonly used agricultural material.
Core components: humic acid (mainly humic acid), potassium element, and a small amount of functional groups (carboxyl, hydroxyl).
Core functions:
① Improving soil (core): breaking soil compaction, promoting the formation of aggregate structure, retaining water and nutrients, and alleviating soil salinization/acidification;
② Promote root growth (stimulate root division);
③ Dissolve phosphorus, potassium and nitrogen fixation, improve fertilizer utilization efficiency (reduce fertilizer loss);
④ Mild growth promotion enhances stress resistance.
Key features: soil improvement as the main approach, supplemented by nutrition. Huangsu acid is water-soluble and highly active, making it a commonly used ingredient in eggplant and fruit crops. Using it alone does not have a significant nutritional effect.
Tomato application scenarios: soil compaction, salinization (greenhouse intercropping plot) improvement, root promotion during seedling stage, combined with chemical fertilizer to improve fertilizer efficiency
4、 Seaweed Essence (Seaweed Extract Fertilizer, Core Biostimulant)

Core positioning: Biological stimulating fertilizer, with "regulating growth and enhancing stress resistance" as the core, supplemented with a small amount of nutrients.
Raw materials: Natural seaweed (kelp, kelp, macroalgae, kelp has the highest activity), made by enzymatic hydrolysis, wall breaking, and low-temperature extraction (to avoid damaging the active substances).
Core ingredients: seaweed polysaccharides, mannitol, betaine, natural plant hormones (auxin, cytokinin, gibberellin, trace), small amounts of amino acids and minerals.
Core functions:
① Strong root promotion (thickening of main roots and increasing of lateral roots, core advantage);
② Enhance crop stress resistance (cold resistance, drought resistance, salt alkali resistance, resistance to minor diseases, commonly used for tomato cold resistance/fruit cracking resistance);
③ Protecting flowers and fruits, promoting even fruit enlargement, and improving fruit shape;
④ Mild supplementation of nutrients activates plant physiological activity.
Key features: Strong activity, minimal dosage, no residue, belonging to the category of "biostimulants", not pure fertilizers, without the core function of improving soil, doubling the effect when used in combination with other fertilizers.
Applicable scenarios for tomatoes: promoting root growth during the seedling stage (preventing root rot, slowing down seedlings quickly), preserving flowers during the flowering period, preventing fruit cracking during the fruit expansion period, cold resistance during winter/early spring, and using microbial agents in continuous cropping plots.
5、 Sodium nitrate and naphthylacetic acid (compound growth regulator of sodium nitrate and naphthylacetic acid)

Core positioning: Artificially synthesized plant growth regulators, pure regulation of crop growth, without any nutritional components.
Raw materials: chemically synthesized, it is a compound preparation of sodium nitrophenol and sodium naphthylacetate (a classic compound in agricultural inputs, synergistically enhancing).
Core ingredients: Sodium nitrophenol (promotes cell division and fertilizer efficiency), Sodium naphthylacetate (promotes rooting, both main and lateral roots).
Core functions:
① Rooting promotion (the rooting effect after compounding is much stronger than that of single naphthylacetic acid);
② Promote cell division and elongation, preserve flowers and fruits, and prevent flower and fruit drop;
③ Activate plant activity, improve fertilizer utilization efficiency, and alleviate pesticide/fertilizer damage;
④ Mild prevention of premature aging.
Key features: quick acting, minimal dosage (ppm level), pure regulation without nutrients, excessive use can easily lead to excessive plant growth and fruit deformities, and cannot replace fertilizers.
Applicable scenarios for tomatoes: promoting root growth during seedling stage (increasing survival rate), delaying seedling growth after transplantation, preserving flowers and fruits during flowering period, and recovering from minor pesticide/fertilizer damage.
6、 Microbial agents (agricultural beneficial microbial preparations)

Core positioning: Soil microecological improver, with "live beneficial bacteria" as the core, to improve soil, inhibit bacteria, and promote absorption.
Raw materials: artificially cultivated beneficial microbial strains (core)+organic matter carriers (wheat bran, soybean meal, peat, for bacterial reproduction), commonly used strains: Bacillus subtilis, Trichoderma harzianum, Bacillus gelatinosus, Bacillus amyloliquefaciens, rhizobia (the top 4 commonly used types of eggplants)
Core components: active beneficial microorganisms (with effective viable cell count (cfu) as the core indicator, such as 2 billion cfu/g), organic matter carriers, and no fertilizers/nutrients.
Core functions:
① Improving soil microecology (core): Beneficial bacteria colonize and occupy soil ecological niches, inhibiting soil borne pathogens (such as tomato wilt and bacterial wilt), and reducing soil borne diseases;
② Dissolve phosphorus, potassium, and nitrogen, decompose organic matter in the soil, and convert it into nutrients that crops can absorb;
③ Promote root growth and improve crop's ability to absorb water and fertilizer;
④ Long term use to improve soil compaction and reduce obstacles to crop rotation.
Key characteristics: slow efficiency, need to colonize, avoid fungicides, beneficial bacteria require suitable soil environment (temperature, humidity, organic matter) to reproduce, use alone has no quick acting nutritional effect, and cannot be used together with high concentration fungicides/fertilizers.
Applicable scenarios for tomatoes: greenhouse intercropping plots (to prevent bacterial wilt and wilt), soil compaction improvement, base fertilizer combination, root dipping during transplanting, and long-term soil fertility enhancement.

7、 Classic pairing suggestions for planting tomatoes (on-demand combination)

1. Promoting roots and slowing down seedlings during the seedling stage: Seaweed extract+sodium complex/naphthylacetic acid (dipping roots/flushing application), quickly promoting roots and improving survival rate;
2. Prevention of soil borne diseases in continuous cropping plots: Microbial agents (Bacillus subtilis+Trichoderma harzianum)+humic acid (humic acid), humic acid provides a colonization environment for the agents, synergistically improves soil and inhibits bacteria;
3. Fruit expansion and quality improvement: fish protein+seaweed extract (applied by flushing/foliar spraying), supplementing nutrients+promoting fruit expansion+preventing fruit cracking, enhancing fruit sweetness and shape;
4. Adversity recovery (low temperature/drought/pesticide damage): amino acids+complex sodium/naphthylacetic acid (foliar spray), quickly replenish nutrients+activate plants, alleviate stress damage;
5. Daily fertilization and soil improvement: fish protein+humic acid+microbial agents (base fertilizer/flushing), the three work together to supplement nutrition+improve soil+regulate microecology, fundamentally solving the problem of crop rotation.