Korean Natural Farming (KNF) — Complete Guide

Korean Natural Farming (KNF) was developed by Cho Han-Kyu in South Korea in the 1960s. Its core principle is deceptively simple: collect the indigenous microorganisms already adapted to your specific soil and environment, cultivate them, and apply them back. All inputs are made from local, cheap materials.

KNF is now practiced on thousands of farms across Japan, Korea, India, USA, and Hawaii. It is fully compatible with NPOP organic certification.

The Core Philosophy

KNF differs from most organic systems in one fundamental way: instead of importing microbial strains or commercial biofertilizers, KNF starts by capturing the microorganisms already living in your local forest floor. These organisms are perfectly adapted to your climate, soil chemistry, and crop environment — no commercial product can replicate this local specificity.

The system has five core inputs. Each addresses a different aspect of plant nutrition:

1. IMO (Indigenous Microorganisms) — soil biology
2. FAA (Fish Amino Acid) — nitrogen + amino acids
3. FPJ (Fermented Plant Juice) — growth hormones
4. OHN (Oriental Herbal Nutrient) — immune system + growth
5. WCA (Water-Soluble Calcium) — cell walls + fruit sizing

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IMO — Indigenous Microorganisms

The Concept

Every forest floor has a thriving microorganism community — bacteria, fungi, actinomycetes — perfectly adapted to local conditions. KNF captures these organisms and multiplies them for farm use.

Collection: Making IMO-1

Materials:

• Cooked rice (unsalted, cooled to room temperature) — 500g
• Wooden or bamboo box (15cm × 20cm × 5cm) — no metal
• A mature forest — old growth preferred, any natural forest works

Procedure:

1. Fill the wooden box with cooked rice to about 3cm depth
2. Cover loosely with paper (not plastic — needs to breathe)
3. Secure with rubber band or string
4. Take to a forest and place on the forest floor, under leaf litter
5. Cover lightly with fallen leaves
6. Collect after 5-7 days in warm weather, 7-10 days in cool weather

What you are looking for: White, fluffy mycelium covering the rice surface. This is good. You want white or light-coloured mycelium — not black, green, or blue mould (discard if you see these colours).

Why it works: The forest floor is the richest microbial environment available. The cooked rice provides a sterile, neutral medium that these organisms colonize rapidly. The species you collect are the dominant organisms of your specific location.

IMO-2: Activating Your Collection

Materials:

• IMO-1 (your rice collection)
• Brown sugar or jaggery (same weight as IMO-1)

Procedure:

1. Mix IMO-1 and jaggery 1:1 by weight in a glass jar
2. Fill jar to 70% — leave room for expansion
3. Cover with cloth, secure with rubber band (not airtight)
4. Store in cool, dark place for 5-7 days
5. Stir gently daily
6. Ready when it smells pleasant and fermented (not rotten)

Result: IMO-2 is a wet, concentrated microbial culture. Can be stored 6-12 months.

IMO-3 and IMO-4: Field Application

IMO-3 (for large-scale production):

• Mix IMO-2 with rice bran, wheat bran, or crushed grain at 1:50 ratio
• Add enough water to create crumbly consistency (60% moisture)
• Ferment 3-5 days under a tarp (needs some warmth)
• Ready when white mycelium visible throughout

IMO-4 (field-ready):

• Mix IMO-3 with good garden soil and compost
• Apply to field soil 7-14 days before planting

Application rate: IMO-4 at 100-200 kg/ha or IMO-2 directly at 1 litre diluted in 200 litres water, apply to field.

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FAA — Fish Amino Acid

Covered in the Indian Fertilizers section. The KNF version and the traditional Indian fish amino acid are identical in principle and nearly identical in preparation. See the dedicated FAA article.

Key KNF refinement: Cho Han-Kyu specifies small, oily fish (sardines, anchovies) as superior to white fish for amino acid content. In India, small coastal fish (Netholi/Kilakka in Tamil Nadu, Anchovies) are the best IMO-grade material.

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FPJ — Fermented Plant Juice

What It Is

FPJ captures the natural growth hormones and enzymes present in rapidly-growing plant tissue. When actively growing tissue (new shoot tips, flower buds, vine tendrils) is preserved in sugar, the cellular contents — including auxins, cytokinins, and gibberellins — are extracted and preserved.

Preparation

Best plant materials for FPJ:

• Shoot tips of any vigorously growing plants
• New bamboo shoots (excellent)
• Germinating seeds (sprouted wheat, corn)
• Flower buds (especially legume flowers)
• Growing vine tips (cucumber, bitter gourd tips)

Materials:

• Fresh, actively growing plant material
• Brown sugar or jaggery: 2/3 the weight of plant material (not 1:1 — less sugar here)

Procedure:

1. Collect plant material early morning before the sun dries the dew (highest growth hormone content at this time)
2. Chop coarsely — no need to crush
3. Layer with sugar in a glass container: plant material → sugar → plant material → sugar
4. Cover with cloth (not airtight)
5. Press down with a weight
6. Ferment 5-7 days at room temperature
7. Liquid accumulates at the bottom — drain and filter
8. Store in dark bottles

What FPJ contains: Auxins (root growth), cytokinins (cell division, leaf expansion), gibberellins (stem elongation, flowering), along with natural sugars and enzymes.

Application

Vegetative growth: 1-2 mL FPJ per litre water, foliar spray every 7-10 days Flowering initiation: 2 mL/L at the transition to reproductive stage Fruit development: 1 mL/L

Which FPJ to use:

• Bamboo shoot FPJ → rapid vegetative growth
• Legume flower FPJ → flowering and fruiting
• Grain sprout FPJ → general growth enhancement

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OHN — Oriental Herbal Nutrient

OHN is a fermented extract of pungent, aromatic herbs traditionally used in Asian medicine. It stimulates plant immune response and provides growth-promoting compounds.

Traditional Recipe

Ingredients:

• Garlic: 1 part
• Ginger: 1 part
• Angelica (or any bitter root herb): 1 part
• Cinnamon: 1 part
• Turmeric (Indian addition): 1 part
• Alcohol (rice wine, country liquor) or brown sugar

Procedure:

1. Grate/slice all ingredients finely
2. Pack into separate jars with brown sugar (1:1) OR steep in alcohol (traditional)
3. Ferment each separately for 7 days
4. Combine equal parts of each extract
5. Store indefinitely

India-specific simplification: Use garlic + ginger + turmeric + neem leaf + tulsi. All locally available, all potent, all effective.

Why It Works

Garlic (allicin), ginger (gingerols), turmeric (curcumin), and neem (azadirachtin/nimbin) are all known antimicrobial and growth-promoting compounds. Applied to plants, they stimulate the plant's systemic acquired resistance (SAR) — essentially priming the immune system.

Application: 1-2 mL per litre water as foliar spray. Weekly preventive application. Most effective when used before disease pressure, not after.

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WCA — Water-Soluble Calcium

What It Is

WCA provides soluble calcium that the plant can directly absorb and use for cell wall construction, fruit sizing, and signal transduction.

Preparation

From eggshells (easiest):

1. Collect eggshells, bake in oven at 200°C for 15-20 minutes (becomes white calcium oxide)
2. Cool completely
3. Dissolve in 10 parts brown rice vinegar (or any food-grade vinegar)
4. Vigorous bubbling = calcium acetate forming
5. Let settle and clarify 7 days
6. Filter and store — good indefinitely

From seashells or coral (alternative): Same process — burn, dissolve in vinegar.

Why Vinegar?

Calcium carbonate (CaCO3) is insoluble in water — plants cannot absorb it. Dissolving in acetic acid (vinegar) converts it to calcium acetate — water-soluble and directly plant-available.

Application

Foliar spray: 1-2 mL per litre water at fruit-setting stage Against blossom end rot: 2 mL/L weekly during fruiting Cell wall strengthening: 1 mL/L weekly during vegetative growth

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KNF Application Schedule for Indian Conditions

Growth Stage	Inputs	Rate
Land prep (2 weeks before sowing)	IMO-4	100-200 kg/ha
Seed treatment	FAA + IMO-2	2 mL FAA + 1 mL IMO per L water; soak
Germination-establishment	FPJ (grain sprout)	1 mL/L foliar, every 7 days
Vegetative	FPJ + IMO-2	1 mL FPJ + 1 mL IMO per L, foliar
Pre-flowering	OHN + FPJ (flower bud)	2 mL OHN + 2 mL FPJ per L
Flowering	FAA + OHN	1 mL each per L
Fruit set	WCA + FAA	2 mL WCA + 1 mL FAA per L
Maturation	WCA	2 mL/L weekly

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KNF vs Jeevamrutham — A Comparison

Aspect	KNF	Jeevamrutham (ZBNF)
Core philosophy	Indigenous microorganism culture	Cow-derived microbial inoculant
Local adaptation	Highest (captures local forest organisms)	High (cow manure has local microbes)
Input cost	Near zero	Near zero
Preparation complexity	Higher (multiple inputs, stages)	Simpler
Input range	5 specialised inputs	2 core inputs
India suitability	Excellent	Excellent
Best combined use	IMO with Jeevamrutham — synergistic	—

The ideal approach for advanced Indian organic farmers: Use Jeevamrutham as the primary microbial base (simpler, proven, widely tested in India) and layer KNF's FPJ and FAA for targeted growth stage support. The two systems are fully compatible.