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Kumamoto Grower: Wild-Grass Compost Cut Tomato Wilt

Teruhiko Sawamura, Higo Ayumi no Kai Co., Ltd. (有限会社肥後あゆみの会), organic tomato farm, Shiranui, Uki City, Kumamoto · Japan

Spoken in Japanese. Translated to English and checked line by line.

Teruhiko Sawamura grows organic greenhouse tomatoes in Shiranui, Kumamoto, using natural farming he learned from Master Cho. He builds soil with riverbank reeds and grasses aged three years into low-nitrogen compost, plus home-made bokashi made on a clay floor, and sprays a home-made plant extract with brown rice vinegar and seawater. He reports much less bacterial wilt, organic tomatoes shipped in the scarce autumn season from ten years of his own saved seed, and support from the Kumamoto governor after the 2016 earthquake. It is a farm report with photos; no trial data were shown.

What they found

The question

Main claim: building soil with long-aged wild-grass compost and home-made bokashi lets a Kumamoto greenhouse farm grow tomatoes organically, with far less soil-borne disease.

How they tested it

Higo Ayumi no Kai, Shiranui Town, Uki City, Kumamoto Prefecture, on the south coast of the Uto Peninsula, mild climate. Two field sites, one near the sea and one near the mountains. Greenhouse tomatoes (including mini tomatoes) are the main crop; onions grown from sets come before the tomatoes in the greenhouse; also rice. Farm history from the slides: began farming in 1980 after Kumamoto Prefectural Agricultural College with 40 a of connected greenhouses (melon and tomato); took over the farm in 1986; from 1988 duck-rice farming without herbicide or chemical fertilizer, then deep-water weed control from 1994; organic JAS for paddy in 1998, open-field vegetables in 1999 and greenhouse vegetables in 2001; group founded 1996, company 2001; bokashi workshops through JA from 2006; organic-JAS processing kitchen (Tenshin Kōbō) in 2015. Farm area, yields of tomato, and any comparison with conventional growing were not given.

What was compared
  • Wild-grass compost — Reeds, silver grass and other wild grasses from riverbanks, cut twice a year (spring and autumn) by the national government and given to him free as waste. Aged about three years; by the second year it is close to soil. Low in nitrogen.
  • Bokashi fertilizer — About 40% rice bran and 40% red soil; the other 20% from shrimp and crab powder, guano phosphate, fish meal, bone meal, oyster-shell lime and rapeseed oil cake. Made on a clay-soil floor (he says concrete lowers microbial activity), turned several times over about 25–30 days, heating to about 65 °C; nitrogen adjusted with fish meal and oil cake (slide).
  • Activated liquid (a plant extract much like Food, FPJ) — Extracts of bamboo shoots, seaweed, Japanese parsley (dropwort), mugwort and akebi taken out with brown sugar, mixed with brown rice vinegar (Cleanser) and seawater (Minerals), sprayed on the crops regularly. No dilution or frequency given.
  • Organic-approved products — Sticky traps, a biological insecticide for whitefly (BotaniGard on the slide), a BT product for caterpillars (XenTari), sulfur flowable for powdery mildew and mites, and other listed products (Gottsu A, Sun Crystal, Botokiller, Soft Silica, bumblebees).
  • Greenhouse set-up — Insect nets on sides, ends and vents, moth-repelling lamps; buried pipes to drain the high water table; well water and drip irrigation; wood-chip boiler for winter heat.
Results
  1. Bacterial wilt of tomato dropped a great deal

    Said after switching to wild-grass compost and bokashi only; the slide reads 'growing with only wild-grass compost and bokashi fertilizer, tomato bacterial wilt also…' (rest hidden). No counts or percentages given. He named the wilt types as 'J1, J3'.

    ▶ 16:59 Said and shown on the slides

  2. White roots and more vigor with low-nitrogen compost

    Slide: applying low-nitrogen compost gave more white roots and vigorous crops, less soil disease, and natural taste and aroma. He showed roots growing into the compost 'white, without a single sign of damage'. Observation only.

    ▶ 7:16 Said and shown on the slides

  3. Organic tomatoes shipped September to November, the scarcest season

    He credits ten years of saving his own seed. The interpreter said August to October.

    ▶ 18:16 As spoken

  4. Rice yield 7 bales of brown rice per 10 a without fertilizer

    Slide only: paddy fed with groundwater only, with Chinese milk vetch (renge) and no fertilizer; medaka fish, rice-paddy shrimp, diving beetles, water fleas and giant water bugs appear. 7 bales/10 a is about 420 kg/10 a (4.2 t/ha). He said snails eat the weeds so no weeding is needed.

    ▶ 14:59 From the slides

  5. The April 2016 earthquake broke everything

    Said right after describing the extract liquid; what exactly broke is not clear in the audio (likely his storage containers).

    ▶ 11:37 As spoken

  6. Kumamoto governor backing; first organic shipping center due this month

    After the earthquake the prefectural governor agreed to support spreading their farming; the first organic produce shipping center in his area was to be completed in October 2016 (the interpreter said it was already complete).

    ▶ 22:26 As spoken

Hold it loosely
  • A farmer's report, not a trial: no control, no measurements, no statistics.
  • The drop in bacterial wilt is his observation; no numbers, years or comparison were given, and the slide text is partly hidden.
  • Compost, bokashi, extract, nets, drainage and organic-approved pesticides were all used together, so no single practice can be credited.
  • Rates and dilutions for the extract spray and the compost were not given.
  • The rice yield is from a slide only and was not discussed.
For your farm
  • Grass cut by road and river crews can be free compost material; aged about three years it becomes soil-like and low in nitrogen.
  • A bokashi of about 40% rice bran, 40% red soil and 20% fish, shellfish and plant meals, turned for 25–30 days, is the recipe he uses.
  • Making compost and bokashi on a soil or clay floor, not concrete, keeps microbes active, in his experience.
  • Saving your own seed for years can help a crop fit a hard season; his tomatoes ship in the scarce autumn months.
  • In flooded rice, snails can do the weeding.

Next to Master Cho's teaching

  • Goes further

    Make bokashi on a soil floor, not concrete Cho's livestock teaching says do not use concrete floors and keep the floor in touch with the soil so microbes can thrive; Sawamura applies the same idea to where he makes bokashi.

    cho-livestock-guide-translation

  • Agrees

    Compost ready in 25–30 days; move away from nitrogen Cho describes rapidly maturing compost from local materials in 20–30 days and says farmers must move away from nitrogen-based fertilizer.

    Cho, Janong Natural Farming (2010 draft), p. 65

  • Agrees

    Low-nitrogen feeding for strong roots Cho warns that rich base manure makes crops lazy and that withholding fertilizer pushes main roots, side roots and root hairs, matching the white-root effect Sawamura reports.

    Cho, Janong Natural Farming (2003), p. 71

  • Agrees

    Mugwort and dropwort extract with brown rice vinegar and seawater Cho's basic spray combines Food (FPJ) made from mugwort and dropwort with brown rice vinegar and fermented seawater, close to Sawamura's activated liquid.

    Cho - DVD rips/NATURAL_FARMING_4 @ 0:12:36 (translated)

  • Agrees

    Saving his own seed for ten years Cho teaches that seed raised under hard local conditions has better adaptability and vitality than overprotected seed.

    Cho, Cho Han-Kyu's Natural Farming (Theory), p. 40

“The roots of this plant growing into the compost are white, without a single sign of damage.”

▶ 7:16

“With this wild-grass compost and bokashi fertilizer, bacterial wilt has dropped a great deal.”

▶ 16:59

“What matters most now, I believe, is how we raise the next generation.”

▶ 20:58

In this talk

  1. 0:00Title, the 2016 earthquake, where he farms
  2. 1:39Shiranui and the tomato greenhouses
  3. 3:02Organic certification and the company
  4. 3:53Spreading Cho's natural farming in Japan
  5. 4:20Three-year wild-grass compost
  6. 6:03Free grass from riverbank mowing
  7. 7:16White roots in the compost
  8. 8:05Bokashi materials and ratio
  9. 9:35Clay floor, not concrete
  10. 10:45Home-made plant extract spray
  11. 12:28Organic-approved pest and disease products
  12. 14:04Insect nets and drainage
  13. 14:59Rice: snails eat the weeds
  14. 15:33Onions before tomatoes
  15. 16:16Bacterial wilt dropped
  16. 17:15Organic tomatoes in the off-season, own seed
  17. 18:40Wood-chip heating and processing
  18. 19:31Visitors, consumers and young farmers
  19. 22:09Kumamoto support after the earthquake

Transcript

English translation, checked against the Japanese as spoken. Click any time to play from there.