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Agriculture in Japan
MutsuyasuIto*
Higashi-Koigakubo,Kokubunji,Tokyo,Japan
The land in Japan has distinctive characteristics which make it suitable for plant production, being
influencedbyfavorableecologicalconditions.Becauseofthis,intensiveagriculturewithpaddyrice
has been the basis of most economic activity over the last 2,000 years, and the people stayed
predominantlyagriculturaluntilrecently.However,Japanhassincebeentransformedintoaheavily
industrialized society with a remarkably rapid growth of its economy after the Second World War.
NowtheJapanesehavealmostabandonedtheirtraditionalfoodculture,whichdependsonriceplus
other supplemental grain foods, diverse vegetables, mountain plants, and sea products. They have
instead been paying large amounts ofmoney in order to incorporate Westernized fatty and protein-
richfoodsfromallovertheworldintotheircuisine.Riceconsumptionhasdecreaseddramaticallyin
the last half century, and the daily intake of nutritious foods such as meat, milk, and other dairy
productshasincreasedremarkably,leadingtoahighdemandforluxuryfoods.WithintheJapanese
agriculturalsector,onlyriceisproducedtothelevelofnationalself-sufficiency,whileonly50%of
the products derived from animals – themselves raised by concentrates (feed grains) which are
nearly 100 % imported – is supplied domestically (Table 1).
Theearlypostwarefforttoincreasetheproductionoffoodtomeetnationalrequirementsactually
ledtoaseriousproblemfromaround1960,whentheJapaneseeconomyasawholebegantoboom
andagriculturebegantodecline.Ricecultivationnarrowlysurviveswithincreasedabandonmentof
agricultural fields and deterioration of sub-natural environments which the Japanese people had
createdoverthepast2,000years.ThepresentsituationwithJapaneseagricultureisthedegradation
oftherich,greennatureofthecountrythatpeoplehadlongadmiredasMizuho-no-kuni(thelandof
vigorously growing rice plants).
Influential Trends of Geography and Climate in Japanese Islands for
Farming
Japan is a typical island country expanding along the far eastern edge of the temperate Asian
continent.TheJapanesearchipelagocoversavastseaareaincluding6,852islandsthatextendfrom
subtropical Ishigaki (24(cid:1)N, 124(cid:1)E) to the northernmost point of Hokkaidō at Wakkanai (46(cid:1)N,
(cid:1)
142 E). It shows diverse landscapes and meteorological conditions, but most of the area has a
temperate, oceanic climate. The total land area is less than 380,000 km2 (only one-thirtieth of the
territory of China), and the four main islands of Hokkaidō, Honshū, Shikoku, and Kyūshū are
dominatedbysteepmountainsthatoftenreachto1,000morevenmoreabovesealevel.Becauseof
mountainous nature of the islands, the amount of flat land suitable for cultivating crops is less than
15 % of the total area of land (Table 2).
MutsuyasuItoretired.
*Email:[email protected]
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Table1 Domesticsupply,importation,anddomesticdemandofvariousfoodstuffsinJapana
(A)2012a (B)1962a
Domestic Imported Self- Domestic Imported Self- Increasingratioof
supply (in1,000 sufficiency supply (in1,000 sufficiency demandin1962–2012
Products (in1,000t) t) (%) (in1,000t) t) (%) (A/B)
Rice 8,692 848 91.1 13,009 182 98.6 0.72
Wheat 858 6,578 11.5 1,631 2,490 39.6 1.80
Barley 172 1,896 8.3 1,726 0 100.0 1.20
Soybean 236 2,727 8.0 336 1,284 20.7 1.83
Vegetables 11,974 3,302 78.4 12,245 16 99.9 1.25
Fruits 3,027 5,007 37.7 3,387 245 93.3 2.21
Milk 7,608 4,191 64.5 2,526 357 87.6 4.09
Beefb 514 722 41.6 153 4 97.5 7.87
Porkb 1,295 1,141 53.2 322 0 100.0 7.57
Broilerc 1,457 736 66.4 155 0 100.0 14.15
Hen’s 2,507 123 95.3 981 0 100.0 2.68
eggd
aDemandandsupplytableofagriculturalproducts;MinistryofAgriculture,ForestryandFishery,Japan
bIncarcassweight
cInfreshbodyweight
dInsoldamount
Table2 Anabstractoflandsize,vegetation,andagriculturallanduseinJapan
Item Area(km2) Ratio(%)
(A)TotallandsizeofJapana 377,960 100.0
Hokkaidō 83,457 22.1
Honshūd 231,121 61.1
Shikoku 18,793 5.0
Kyūshū 42,194 11.2
Okinawa(RyūkyūIslands) 2,277 0.6
(B)Totalarablelandsb 45,490 12.0
Thoseusedforpaddyriceb 24,690 6.5
(C)Forestsb 244,616 64.7
(D)Grasslandsc 22,337 5.9
aStatisticsJapan(2014)
bAgriculturalstatistics(2013)
cMostlyseminaturalgrasslands.Greencensus,Japan(1983)
dIngeneral,Honshū(=MainProvince)isgeographicallydividedintofiveregions,i.e.,Tōhoku,Kantō,Chūbu,Kinki,
andChūgoku(seeFig.1)
In spite of its more or less cold winter, Japan benefits from a longer warm season and yearlong
rainfallmostlyabove1,000mmperyear(Fig.1),bothofwhichareindeedusefulforhigh-yielding
crop cultivation, particularly for paddy rice. However, the climatic condition also accelerates
harmful weed generation that disturbs pure stand formation of cultivated crops. The generally
warm, moist climate (almost similar to tropical forests during summer seasons), which provides
highorganicproduce,hasledtovegetationwithforestsspreadingthroughoutthearchipelago.These
geographical features present Japanese farmers with a difficulty in scale economy of their farming
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Fig. 1 Regions and climates of Japanese Archipelago – seasonal changes of mean air temperature ((cid:1)C, –●–) and
precipitation((cid:3)10mm, )invariouslocationsfromHokkaidōtoOkinawa.Averageofpast30yearsfrom1981to
2010wasshown(StatisticsofJapan2014,MinistryofInternalAffairsandCommunications).Monthsbelow0(cid:1)Cwere
excludedinthecaseofSapporo(OutlinemapisdeliveredfromthewebsiteofCraftMAP.http://www.craftmap.box-i.
net/)
andforcethemtodocontinualhardworkinalmostalltheseasonstoimproveyieldpotentialperunit
area.
Delayed Start of Paddy Rice Agriculture and Its Remarkable Growth from
the Very Beginning
Inspiteofitsrichpotentialforcropproduction,theactualstartofpaddyricecultivationdidnotoccur
untilseveralthousandyearsafteritsoriginintheYangtzeRiverbasininthenearbyAsiancontinent.
Around 2,400 years ago, when the Jōmon Period (ca. 10, 000 BCE – 400 BCE; this period was
dominatedbyhuntingandgatheringcharacterizedwithstraw-ropepatterned[=jōmon]pottery)was
declining, the arrival of new immigrants from the continent brought techniques for paddy rice
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Fig.2 YoshinogariArcheologicalSiteinSagaPrefecture,NorthKyūshū.Thesitewasfirstexcavatedaround1990,and
a wide area of state-like settlements that developed in the Yayoi Period became apparent through a series of
investigations
cultivation with theirowncultivars. As theYayoi Period(ca. 400BCE–ca.300CE,so-called from
theplaceinTōkyōwherethenewtypepotterieswerefirstunearthed)started,itreplacedthelifestyle
basedonhuntingandgatheringwithonebasedonthecultivationofricesupplementedwithvarious
crops. Because irrigation techniques had been rather primitive and not as sophisticated as in China
when the rice culture was introduced, swampy areas along mountain streams and basins were
primarily used for cultivation. Indeed, wooden farm implements such as hoes and spades were
alreadyverypopularforworkingwithimprovedjaponica-typericevarietiestogetherwithpreparing
and transplanting skills of rice seedlings (a lot of transplanted rice stubbles were traced at various
archeological sites of the Yayoi Period). It looks as if Japanese agriculture had been consistently
staying at an intensive and labor-consuming nature since its origin.
Soon after the introduction of paddy rice in northern Kyūshū around the fourth or fifth century
BCE, paddy rice production and its associated technology began to spread eastward into Shikoku
Island and Kinki region (the southern Honshū near present Ōsaka) where the Yamato Court later
gainedsupremacyoverallofJapan.Atleast2,000yearsago,theyarrivedintheKantoregion(areas
around today’s Tōkyō) and subsequently moved toward north into the Tōhoku (northern Honshū)
region. Large Yayoi remains of paddy fields discovered at Taruyanagi in Aomori Prefecture at the
northernmostendofHonshū(42(cid:1)N)demonstratethatthediffusionofricecultivationwasveryrapid
andtookonlyseveralhundredyearsatmost,despitealargedistanceanddifferentclimatesbetween
northern Kyūshū and northernmost Honshū. Through experiments, Sato (1992) has endeavored to
showthatdomesticallyimprovedthermosensitivecultivars,whichripenedquickerandearlier,were
probably responsible for this rapid progress of rice cultivation in cooler areas.
Development of Farming System in Ancient and Medieval Ages
Althoughthetracesofuplandriceandothermiscellaneousgraincultivationweredetectedinvarious
archeologicalsitesoflateJōmonPeriods,thebeginningoftheYayoiPeriodshouldbethoughtofas
the real dawn of agriculture in Japan. Because of the surplus production of introduced paddy rice
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agriculture, it soon brought about social arrangements with class distinctions. Remains at the
Yoshinogari archeological site in northern Kyūshū demonstrate that the agrarian society of that
time tightly created the construction of circular trenches protecting against their enemies and had a
state-like political structure inwhichsocialstratification becameclearlyvisible (Fig.2).AChinese
historybookinthesecondcenturyCEnotedlong-lastingdisturbancesamongtinytribalcountriesin
western Japan struggling for supremacy among their districts.
A much higher technology for agriculture developed in the subsequent Kofun Period
(ca.300–700CE;Kofunreferstoancienttombmoundspreparedforcentralandlocalrulers).Social
and technological progress came with the introduction of advanced iron implements (those hoes,
plows, and spades led to deeper soil tillage), maintained waterways, reservoirs, canals, and the
orderly planting of rice, all of which resulted in higher yields and the further expansion of arable
land.Thesedevelopmentswereprobablyaccompaniedbyachangefromusingstoneknivestoclip
off the progressively developed panicles of genetically diverse rice population to using sickles to
harvest the aboveground parts of genetically identical crops with their heads attached.
Through these developments, the Yamato Court finally held supremacy over rival countries and
wasabletocarryoutsocial,economic,andpoliticalreformsknownastheTaikaReform(Taikaisthe
name of the era between 645 and 650 CE, which was first recorded in Japan) that promoted a
centralized state similar to that in the ancient empire of China. In 701, the legal system, known as
Ritsuryō (Criminal and Civil Laws), was established to govern the whole country except for
Hokkaidō(which was notyet Japanese territory). Underthe Ritsuryōsystem, canal improvements,
reclamation ofnewpaddy fields,andrezoning ofregular-sizefields wereall plannedbythecentral
government in an effort to significantly increase agricultural production. However, the Japanese
people did not develop customs for raising livestock and poultry for consumption because Bud-
dhismbecametheofficialreligionintheeighthcentury.Sincethen,theydependedgreatlyonriceas
their main food and supplemented it with various other grains and plants with the occasional
addition of fishes. These characteristics of farming and cuisine that date back to the period of
consolidatingcentralpowerinthearchipelagocontinuedoverthecenturiesuntilthebeginningofthe
modern age.
Although the best yields of rice in the Nara Period (710–794) were supposed to be less than
1,000kg per hectare (Furushima 1947; just one-sixth of thepresent yield in Japan), that figure was
surprisingly high when compared to yields of wheat in England during the same period (Evans
1975).Theintroductionofricewasalsoadvantageousforefficientfoodsupplyatthetimebecauseit
required basically no fallowing of fields when they were regularly fertilized and properly
maintained. Thus the paddy rice farming which originated at early Yayoi Period led to a steady
increaseofpopulationsize,inparallelwithsteadydevelopmentofcultivationtechniquesandfurther
expansion of paddy rice fields. In the Nara Period, the official record noted more than five million
citizensinJapaneseterritory(Kitō2000;cf.,about70,000peoplewereestimatedtoliveinthelatest
Jōmon Period [Habu 2004]).
GovernmentalpowerundertheRitsuryōsystem,however,begantocollapseinthemiddleofthe
Heian Period (794–1192), as private territories of powerful aristocrats, temples, shrines, and clans
emerged as shōen (manors). As central rule became weaker and weaker because of the social
changes in the late Heian Period, officials in district branches and wealthy farmers began to arm
themselves, and their influential leaders formed bands of warriors known as samurai. After a long
struggle between samurai bands in various areas, the remaining two most powerful bands – Genji
andHeishi–foughtfornationalsupremacyinthetwelfthcentury.ThewarfinishedwiththeGenjiin
powerandthebeginningoftheKamakuraPeriod(1192–1333)inwhichJapanbecametoberuledby
asamuraigovernment(thefirstshogunate).Inthisfeudalperiod,arelationship developedbetween
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lords and vassals from the samurai class, in which the latter usually engaged in agriculture and
managed their farmlands as well as providing military service for wartime.
The establishment of manors and the intensification of agriculture in each locality resulted in a
furtherriseofagriculturaloutputthatledtoasecondboominlandreclamationforpaddyfields,and
surplus agricultural products were gradually commercialized to create markets in various regions.
Attemptsatdouble-croppinginpaddyfieldsfirstemergedintheKamakuraPeriod,probablytrying
to raise additional winter harvests in lean years at the beginning. Later it was established in wider
areas(particularlyinwesternJapan)asapeculiarrotationalcultivationsystemwithriceforthemain
crop plus wheat, barley, or rape for the winter crop, which was not so popular in other East Asian
areas.
Theincreasingeconomicstrengthofvariouslowerclasses,however,weakenedthecentralpower
of the samurai government and drew Japan into a period of civil wars in the latter part of the
Muromachi Period (the reign of second shogunate Muromachi, 1338–1573). Dominant feudal
powers in various regions began fighting each other in an era known as the Sengoku Period
(1467–1598;Sengokureferstowarringstates).Duringthattime,improvingagriculturalproduction
and expanding arable land were the greatest concerns for powerful territorial lords (Sengoku
Daimyō; daimyō originally meant “great paddy-field-owners”) because of the possibility of immi-
nentwarfare.Theytookcarefulcontrolofpaddyfieldsintheirterritoriesandexpandedareasevenin
hilly diluvial plains by using the construction skills they had earned through their preparation for
civil war.
Unique Developmentof FarmingDuring Edo Period in the Premodern Age
Aftertakingovertheentirecountry,HideyoshiToyotomi implementedacadastral survey(Kenchi)
knownasTaikō-Kenchi(HideyoshiwasknownbythetitleofTaikō)from1582to1598.Thesurvey
involved measuring each paddy field, ranking their productivity to assess the tax base, and
registering of individual landowners. It established the Kokudaka (productivity, koku being a unit
of measurement for rice) system in which arable lands were legally graded in terms of average
productivity. This brought an end to the system of direct rule by feudal lords and determined land
tenureship for small-scale farmers based on nuclear families. Ieyasu Tokugawa defeated the
Toyotomi family in the Battle of Sekigahara (1600) and completed the process of unifying Japan
byestablishinganewshogunate.UndertheTokugawafamily,JapanintheEdoPeriod(1603–1868)
flourishedintheSakoku(seclusionfromothercountries)policy,andeachofthesurvivingSengoku
Daimyō was regulated by the Shōgun (military general) Government established in Edo (present-
day Tōkyō).
Because the daimyō could no longer acquire more territory because of the strict Tokugawa
regulations, the only way that they could expand their power was to reclaim land or to improve
theirfieldstogetbetteryields(mainlyofrice).Thisledtoimprovedirrigationsystemswithinthebig
river basins and diluvial tablelands that could not previously be well controlled and utilized; they
also improved technology for crop cultivation. The average rice yield was recorded as nearly
2,000 kg per hectare in the later period. Hence, political stability and technical innovations in
agriculture brought another population burst in this premodern age, resulting in the dramatic
increase in a shorter period from ca. 10 million people counted in late Sengoku to more than
30millioninthemiddleofEdoPeriod(Kitō2000).However,thisincreasesoonreachedtheceiling
in social stagnation.
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Despite the overall developments in agriculture, however, the farmers who got their own lands
throughtheTaikō-Kenchiwerestrictlyrestrictedtomoveoreventochooseanotherlivelihoodunder
the tightened feudal system. Furthermore, a great deal of their harvested rice was collected by the
daimyō as a tax (nengu) which left the farmers with relatively little rice and therefore, a spartan
existence, particularly in earlier Edo Period. Under such a severe regime, and because of it, many
farmers made remarkable improvements in technology for raising field crops other than rice,
especially for those which were cultivated on upland. Winter harvests from double-cropped paddy
fields were also valuable fruits for farmers as they were often excluded from the nengu.
Theuseofhumanmanureasafertilizerwasanimportantdevelopmentatthistime;itwasusedfor
higher production in intensively managed paddy and upland fields. In fact, all of human feces and
urine were carefully collected andstoredforfermentation by eachfarmer.FromEdoorsomeother
big citiesasŌsaka and Kyōto,most ofthe “nightsoil”was transported tonearby ruralareas where
cash crop cultivation was flourishing. It may be said that the Edo people who lived more than
200 years ago had almost completed the thorough use of resources and the technological improve-
ments in recycling that are informative even for today’s societies.
In the Edo Period, many books called nōsho (writings on agriculture) were written in various
areas, and some of them were published in xylography and distributed widely. Publications to
describe agricultural technology and various local cultivars contributed to further technological
improvementsandexaminationoftraditionalcultivars.Amongothers,themostnotableworkinthe
firsthalfofEdoPeriodwasNōgyōZensho(CompleteWritingsonAgriculture,1697)bythelordless
samuraiYasusadaMiyazaki(1623–1697)innorthernKyūshū.Thisbookprovidedpracticalinstruc-
tionsbasedontheauthor’scomprehensiveknowledgeacquiredovertheyears,whilethebasicstyle
of the book followed the famous Chinese Nóngzhèng Quánshū (Complete Book on the Adminis-
trationofFarming,1639)whichwaswrittenbyXúGuāngqǐlateintheMingDynasty.Miyazakihad
longregrettedthatthelifeoffarmersrequiredhardlaborandlowincomesbecauseoftheirpaucityof
knowledge about the principles of agriculture (Fig. 3), so he published information about the
available scientific principles and technology that was easily put to use anywhere in the country.
In a sense, an original agricultural science, rooted in the traditional culture of Japan, came into
existence by this work. His book greatly influenced agriculture throughout the Edo Period, and it
was reprinted repeatedly over 150 years, almost until the end of Edo Period.
TheTokugawashogunate builtmanyroadswhichoriginated inEdoorŌsakaintheseventeenth
century. Various sea routes for shipping were also established, so an integrated system of transpor-
tation throughout all of Japan was progressively built with progressive development of a market
economyinthelatter EdoPeriod.Inthissituation,NagatsuneŌkura(1768–1860),oneofthemost
famous scholars of agriculture late in the Edo Period, wrote many volumes on agriculture and
particularly made efforts to publish various textbooks about cash crops. He also prepared manuals
on agricultural equipment and wrote about plant protection. The application ofthis knowledge and
thosetechniquesresultedintheprosperouscultivationofrapeseed,cotton,andotherindustrialcrops
in the Kinki region and the rise of the processing industry near Ōsaka that increased the amount of
merchandise available for distribution.
Despitetheremarkablegrowthinproductivity,farmingthroughouttheEdoPeriodstilldepended
onhumanpower,andthemeritofscalewashardlyfound.Althoughplowingwithdraftanimalswas
practiced to some degree in and around the Kinki region, it did not spread throughout the country,
partly because the traditional long-soled plows they used were less efficient than hoes for deep
tillage in paddy fields to get a higher yield with a higher level of fertilizer use. Hence, the labor-
intensive cultivation continued to dominate and relied on specialized hoes and spades just handled
by man power. In his nōsho (An Investigation of Usefulness of Various Agricultural Tools),
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Fig.3 AricecultivationcalendarinEdoPeriod,startingwiththefieldpreparationinspringandendingwiththeharvest
processing in autumn (cited from the website of National Diet Library, Tokyo). The illustration was shown at the
introductionofMiyazaki’sfamousbook–NōgyoZensho.Farmershadtoworkveryhardforthecareofgrowthand
maturationofpaddyriceplantsfromearlyspringtothemiddleofautumnwithoutanyvacantdays.(a)Preparingrice
seedlingsandpaddyfields.(b)Carryingseedlingsfortransplant.(c)Transplantingseedlings.(d)Takingcareofgrowing
riceplants.(e)Harvestingrice.(f)Processingharvestedrice
NagatsuneŌkuraillustratedadiverserangeofhoesmodifiedforvariouspurposesorsoilconditions
(Fig. 4). The intensive farming system without any convenient machinery had lasted until quite
recently, just supplemented by step-by-step fine tuning of hand-operated tools.
AnotherexampleofprosperousdevelopmentofJapanesefarmingwasfoundinsericultureinthe
late Edo Period. A lot of novel techniques were invented by farmers in various places of silk
production (a nōsho on sericulture written by devoted sericulturist Morikuni Uegaki (1753–1808)
waseventranslatedintoFrenchin1848whenthecountrywasnotopenedtotheWestyet).Instances
included thermal management of silkworm development and crossbreeding of various productive
strains; both of these scientific technologies were not well distributed yet in Western countries of
thosedays.Thesetechnologiesdevelopedduringthepremodernagelatercontributedtothefurther
development of sericulture and silk-spinning industries in following Meiji Period.
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Fig. 4 Various kind of hoes illustrated in Nōgu Benri Ron (An Investigation on Usefulness of Various Agricultural
Tools)writtenbyNagatsuneŌkuralateintheEdoPeriod(citedfromthewebsiteofNationalDietLibrary,Tokyo).He
made a detailed investigation on the variation of different kind of hoes that were carefully modified for various
cultivatingpurposesinvariousdistricts.Top:acomparisonofdifferentformsofhiraguwa(plowinghoes).Bottom:a
comparisonofthesizeandformofeachpartofbitchuguwa(cultivationhoes)
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Modernization in Japanese Agriculture After the Meiji Restoration
In the second half of the nineteenth century, Japan decided to open itself to international relations
after a 200-year-long Sakoku. The Tokugawa regime lost its ability to govern effectively, and the
feudal system finally came to an end in 1868. The new government under the restored emperor
declared the beginning of the Meiji Period (1868–1912) and began to modernize Japan along
contemporary Western lines. As Japan had almost no particular source of revenue except for
agricultureatthattimeandsince80%ofthepopulationbelongedtotheagrarianclass,thecollection
of land taxes was of great concern to the new government. Introducing Western agricultural
technology (Taisei nōgaku) was therefore an urgent project for the government, which wanted to
increase the wealth and military strength of the country in order to catch up with European powers
and the United States in a short amount of time.
However, the modernization of Japanese agriculture at the outset was not as successful as it was
with industrialization, because the earliest foreign experts invited into the country simply tried to
bringtheirownstyleofagriculturewithoutanymodificationanddidnotconsiderthedifferentstate
ofaffairsthatexistedbetweenJapanandtheirhomelands.However,afewEuropeanscientistsuseda
different approach to developing Japanese agriculture by evaluating traditional technology and
knowledge. For instance, Max Fesca from Germany made a huge scientific effort at analyzing
traditional Japanese techniques of cultivation, applying Western technology to suit the needs of
Japaneseagriculture,anddevelopingnewtechnologyforpracticalcultivation.Rōnō(rōnōrefersto
farmerswithoutstandingfarmingknowledge),whohadfullymasteredtheknowledgeandskillsof
traditionalagriculturethathadalreadybeensystematizedintheEdoPeriod,alsoplayedanimportant
role in the modernization of traditional agricultural technology and its extension throughout the
country in the late nineteenth century.
In the early twentieth century, Japan had nearly completed establishing a public system of
education and scientific research based on Western models with a modernized governing system.
AscentralizedpowerbecamestrongerthroughandaftertheFirstWorldWar,variousresearchresults
achievedatinstitutesanduniversitiescontributedtotheremarkableincreaseinagriculturalproduc-
tion from 1920 to 1940. Large-scale land innovation and wide distribution of chemical fertilizers
alsoacceleratedtheprogress.StudiesonthegenomeofwheatstrainsbyHitoshiKihara,theautumn
deterioration of paddy soils by Matsusaburō Shioiri, and the selection of the famous Nōrin
No. 10 wheat variety (Nōrin is the abbreviation for the Ministry of Agriculture and Forestry) were
all world-renown accomplishments prior to the Second World War.
Through repeated crossing with various native cultivars from Mexico, for instance, the Nōrin
No.10laterobtainedhigh-yieldingdwarfcultivars,whichincreasedwheatproductionindeveloping
countriesdramaticallythroughthe“GreenRevolution.”Alsopursuedwastheconceptof“synchro-
nism in tillering and tiller development in rice, wheat, and barley crops” established by Tsukuda
Katayama, which led to precise technology for monitoring the growth and improving the yield of
rice and other grain crops (Fig. 5). In Western countries, phyllochron (leaf appearance interval)
studieswereinitiatedinthelast40yearstotakeprecisecontrolofthegrowthofimprovedwheatand
other crops. In fact, Katayama and his students completed the principle of phyllochronic develop-
ment of grain crops more than 60 years ago, although the original studies, written mostly in
Japanese, were hardly read by Western researchers.
ThescientificachievementsmadebeforetheSecondWorldWarprincipallycontributedtohigher
productivity(approachingtothelevelof4,000kgperhectareincaseofrice);however,thefarming
system still remained unchanged in a traditional, labor-intensive state for individual farmers and
villages.
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