prepare-soil
About
This skill provides a structured method for assessing and improving garden soil through testing, amending, composting, and biodynamic preparations. It guides users through practical steps like jar tests, texture adjustments, and establishing composting systems. Developers can use it to build features for garden planning, soil health analysis, and transitioning to organic or no-till practices.
Quick Install
Claude Code
Recommendednpx skills add pjt222/agent-almanac -a claude-code/plugin add https://github.com/pjt222/agent-almanacgit clone https://github.com/pjt222/agent-almanac.git ~/.claude/skills/prepare-soilCopy and paste this command in Claude Code to install this skill
Documentation
備土
察土情並以改、堆、活活生健活之土。
用時
- 始新畦需察既土
- 水光足而植不繁(土或為因)
- 欲轉慣行為有機或生機之修
- 土已實、貧、或拒水
- 需立堆肥系
- 欲施生機備(500-508)
入
- 必要:可至所察之土(畦、田、容器)
- 可選:當前土試果(pH、N-P-K、有機質 %)
- 可選:園史(前作、所施改、栽年)
- 可選:欲種之作物或植
- 可選:法之偏(有機、生機、樸門)
法
第一步:察土
三田試無需實驗室——皆行之。
Test 1: Jar Test (Texture — Sand/Silt/Clay Ratio)
1. Fill a quart jar 1/3 full with soil from 15cm depth
2. Fill to top with water, add 1 tablespoon dish soap
3. Shake vigorously for 3 minutes, then set on level surface
4. Read layers after settling:
- Sand settles in 1 minute (bottom layer)
- Silt settles in 4-6 hours (middle layer)
- Clay settles in 24-48 hours (top layer)
5. Measure each layer as % of total soil depth
- Ideal garden soil: ~40% sand, ~40% silt, ~20% clay (loam)
Test 2: Spade Test (Structure and Compaction)
1. Push a spade into moist soil to full depth (25cm)
2. Lever up a block of soil and place on a board
3. Observe:
- Crumbles easily → good structure
- Breaks into angular blocks → compacted
- Smears or is sticky → too much clay or waterlogged
- Layers visible → hardpan or plough pan present
4. Smell the soil:
- Sweet, earthy → healthy aerobic biology
- Sour, sulphurous → anaerobic conditions (drainage problem)
Test 3: Earthworm Count (Biological Activity)
1. Dig a 30cm × 30cm × 30cm cube of soil
2. Place on a tarp or board
3. Gently break apart and count earthworms
- 0-5: Poor biology — needs organic matter
- 5-10: Fair — improving but not yet thriving
- 10-20: Good — healthy biological activity
- 20+: Excellent — this soil is alive
得:土質、構、生機之清像。罐試果、構評、蚓計皆有。
敗則:若罐試層難分,重以淨水並更激搖。若蚓計零且土酸臭,土或厭氧——改前必先治排水。
第二步:診斷與謀改
對察立改謀。
Amendment by Soil Type:
┌────────────────┬─────────────────────────┬──────────────────────────────┐
│ Diagnosis │ Symptoms │ Amendment │
├────────────────┼─────────────────────────┼──────────────────────────────┤
│ Heavy clay │ Sticky, slow drainage, │ Gypsum (calcium sulfate) │
│ │ >40% clay in jar test │ 1 kg/m², worked into top │
│ │ │ 15cm. Add coarse compost. │
│ │ │ Plant daikon radish to break │
│ │ │ hardpan biologically. │
├────────────────┼─────────────────────────┼──────────────────────────────┤
│ Sandy │ Drains instantly, won't │ Compost 5-10cm thick, worked │
│ │ hold moisture, <20% │ into top 20cm. Add biochar │
│ │ silt+clay in jar test │ (pre-charged with compost │
│ │ │ tea) for moisture retention. │
├────────────────┼─────────────────────────┼──────────────────────────────┤
│ Depleted │ Pale colour, low worm │ 10cm compost top-dress. │
│ │ count, poor growth │ Cover crop (legume mix) for │
│ │ despite watering │ nitrogen fixation. Foliar │
│ │ │ seaweed spray monthly. │
├────────────────┼─────────────────────────┼──────────────────────────────┤
│ Compacted │ Angular blocks in spade │ Broadfork (not rototiller) │
│ │ test, surface pooling, │ to fracture without │
│ │ hard when dry │ inverting. Deep mulch (15cm │
│ │ │ wood chips on paths). Plant │
│ │ │ deep-rooted comfrey. │
├────────────────┼─────────────────────────┼──────────────────────────────┤
│ Acidic (pH<6) │ Blueberries thrive but │ Wood ash (light application) │
│ │ brassicas struggle │ or dolomite lime. Test pH │
│ │ │ before and after — adjust │
│ │ │ slowly over 2 seasons. │
├────────────────┼─────────────────────────┼──────────────────────────────┤
│ Alkaline (pH>7)│ Iron chlorosis (yellow │ Elemental sulphur or acidic │
│ │ leaves, green veins) │ compost (pine needles, oak │
│ │ │ leaves). Very slow to shift. │
└────────────────┴─────────────────────────┴──────────────────────────────┘
得:合所診土情之具體改謀。
敗則:若諸情疊(如重黏且貧),先治構(gypsum + 寬叉)後生機(堆肥 + 覆作)。一時欲修諸事壓土。
第三步:建堆肥
依可用空間、料、時程擇法。
Composting Methods:
┌────────────────┬──────────────┬──────────────┬─────────────────────────┐
│ Method │ Time to │ Space Needed │ Best For │
│ │ Finished │ │ │
├────────────────┼──────────────┼──────────────┼─────────────────────────┤
│ Hot compost │ 4-8 weeks │ 1m³ minimum │ Large gardens, weed │
│ │ │ │ seed / disease kill │
├────────────────┼──────────────┼──────────────┼─────────────────────────┤
│ Cold compost │ 6-12 months │ Any size │ Low effort, small │
│ │ │ │ quantities │
├────────────────┼──────────────┼──────────────┼─────────────────────────┤
│ Vermicompost │ 3-6 months │ 0.5m² indoor │ Kitchen scraps, indoor │
│ │ │ │ / apartment gardens │
└────────────────┴──────────────┴──────────────┴─────────────────────────┘
Hot Compost Protocol:
1. Build pile in layers — 2 parts brown (carbon) to 1 part green (nitrogen)
- Brown: dried leaves, straw, cardboard, wood chips
- Green: kitchen scraps, fresh grass, manure, coffee grounds
2. Moisten each layer (damp sponge consistency)
3. Pile must be at least 1m × 1m × 1m to reach temperature
4. Internal temperature should reach 55-65°C (130-150°F) within 3-5 days
5. Turn pile when temperature drops below 45°C (every 5-7 days)
6. After 3-4 turns, cure for 2-4 weeks without turning
7. Finished compost: dark, crumbly, smells like forest floor, no recognizable inputs
Never Compost:
- Meat, dairy, oils (attract pests)
- Diseased plant material (unless hot compost reaches 60°C+ for 3 days)
- Treated wood, glossy paper
- Pet waste (pathogen risk)
得:堆肥系已立、首批進中。
敗則:若熱堆不熱:察濕(過乾或過濕)、察 C:N 比(增綠為氮)、察堆大(< 1m³ 不能穩熱)。
第四步:施不耕與覆作
護並建土構而不翻。
No-Till Sheet Mulching (New Bed from Lawn or Weeds):
1. Mow or scythe existing vegetation as low as possible
2. Layer cardboard (overlapping edges) directly on ground — no gaps
3. Wet cardboard thoroughly
4. Add 5cm compost on top of cardboard
5. Add 10-15cm organic mulch (straw, wood chips, leaves)
6. Wait 3-6 months (autumn application → spring planting)
7. Plant through mulch by pulling it aside — do not till
Cover Crop Quick Reference:
┌─────────────────┬────────────────┬───────────────────────────────┐
│ Crop │ Season │ Benefit │
├─────────────────┼────────────────┼───────────────────────────────┤
│ Crimson clover │ Autumn sow │ Nitrogen fixation, bee forage │
│ Winter rye │ Autumn sow │ Biomass, weed suppression │
│ Buckwheat │ Summer sow │ Fast cover, phosphorus mining │
│ Phacelia │ Spring/autumn │ Pollinator magnet, breaks up │
│ │ │ compaction │
│ Daikon radish │ Autumn sow │ Deep root breaks hardpan, │
│ │ │ decomposes in place over │
│ │ │ winter (bio-drill) │
└─────────────────┴────────────────┴───────────────────────────────┘
Terminate cover crops by:
- Crimp and roll (best — leaves roots in place)
- Scythe and lay as mulch
- Never rototill — this destroys the soil structure you're building
得:土終年護、生機未擾、有機質增。
敗則:若覆作未立,察播深(多需表或淺播)與濕。重播或施厚覆為替代地表覆。
第五步:生機備(可選——進階)
為循 Demeter 或生機原則之修者。
Biodynamic Preparations Overview:
┌──────┬───────────────┬──────────────────────┬─────────────────────────┐
│ Prep │ Material │ Application │ Purpose │
├──────┼───────────────┼──────────────────────┼─────────────────────────┤
│ 500 │ Horn manure │ Spray on soil, │ Stimulate soil biology, │
│ │ │ autumn & spring │ root growth, humus │
├──────┼───────────────┼──────────────────────┼─────────────────────────┤
│ 501 │ Horn silica │ Spray on foliage, │ Light metabolism, fruit │
│ │ │ morning, summer │ quality, ripening │
├──────┼───────────────┼──────────────────────┼─────────────────────────┤
│ 502 │ Yarrow │ Added to compost │ Sulphur and potassium │
│ 503 │ Chamomile │ Added to compost │ Calcium, stabilizes N │
│ 504 │ Stinging nettle│ Added to compost │ Iron, stimulates soil │
│ 505 │ Oak bark │ Added to compost │ Calcium, disease resist │
│ 506 │ Dandelion │ Added to compost │ Silica, light forces │
│ 507 │ Valerian │ Sprayed on compost │ Warmth, phosphorus │
├──────┼───────────────┼──────────────────────┼─────────────────────────┤
│ 508 │ Horsetail tea │ Spray on foliage │ Fungal disease prevent │
└──────┴───────────────┴──────────────────────┴─────────────────────────┘
Preparation 500 Application:
1. Stir 100g horn manure in 35 litres warm water
2. Stir dynamically for 1 hour — create vortex, reverse, create vortex
(alternating direction every minute)
3. Apply within 1 hour of stirring
4. Spray in large droplets on soil surface — late afternoon, descending moon
5. Apply autumn (before winter) and early spring (before sowing)
Note: Biodynamic preparations are available from certified suppliers
or local biodynamic farming groups. Making your own requires the
previous season's preparations and specific animal horn sheaths.
得:備於正時與月相施。土生機活見於 1-2 季。
敗則:若備不可得,良堆肥與覆作得 80% 之生機益。備增而非健土管之代。
第六步:癒檢點——改後察
改後六週,重察土。
Post-Amendment Soil Health Check:
1. Repeat the spade test:
- Has structure improved? (Crumbles more easily)
- Are roots penetrating deeper?
- Any remaining hardpan layers?
2. Repeat the earthworm count:
- Has the count increased? (Even 2-3 more is progress)
- Are worms distributed through the depth or just at surface?
3. Drainage test:
- Dig a 30cm hole, fill with water, let drain, refill
- Second fill should drain within 1-4 hours
- <1 hour: very free draining (may need more organic matter)
- >4 hours: still compacted or clay-heavy (continue treatment)
4. Surface observation:
- Fungal threads visible in mulch layer? (Good — decomposition active)
- Green algae on surface? (Too wet or too compacted)
- Mulch layer breaking down? (Biology is working)
Triage:
- All improving → Continue current approach, reassess next season
- Structure improved but worms low → Add more diverse organic matter
- Worms present but drainage poor → Broadfork again, add coarse material
- No improvement → Soil may have contamination — consider lab test for heavy metals
得:3 指標中至少 2 之可量進。
敗則:若 6 週無進,問題或深於表土改可治。考引入土混之高架畦為並策,續多季進地中之土。
驗
- 三田試皆完(罐、鏟、蚓)
- 自試果正診土型
- 改謀合所診情
- 堆肥系已立(熱、冷、或蚓)
- 土終年覆(覆、覆作、或活植)
- 無耕或翻土
- 改後 6 週行癒檢點
- 園誌以試果與所施改更
陷
- 不試而加:隨改費而或惡失衡。常先試
- 耕:覺有效然破土構、殺蚯蚓、引草籽至表。需鬆者用寬叉
- 裸土:露土失濕、構、生機。常覆或種覆作
- 新糞於畦:燒根並引病原。諸糞觸土前堆至少 6 月
- 不試 pH 而灰:過灰致養不可得。唯依實試果調 pH
- 求即效:建土以季年計,非週
參
cultivate-bonsai— 盆景土混(akadama/浮石/熔岩)為專土備plan-garden-calendar— 土改之時合季曆(秋灰、春堆肥)read-garden— 土觀為園察協之部heal— 改後察循癒分類模式forage-plants— 明土植關係助察野植棲make-fire— 火之木灰為傳統土改(鉀 + 灰)
GitHub Repository
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