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RICE RATOONING IN MADAGASCAR 133Table 1. Main and ratoon crop yields and green straw yields of six rice varieties atLac Alaotra, Madagascar (adapted from Dobos [3]).Variety Yield Ratoon crop Duration of Yield ofyield ratoon crop green straw(t/ha)(t/ha) (d) (t/ha)Kaoshung 21Nahda-11No. 1300 (1 cal)No. 1300/Taichung-150No. 1300/ShineilR356-1-46B-4-6-185.63.92.42.92.53.2– 81 3.42.294 1.61.21.699942.22.01.794 2.05.099 3.0Table 2. Ratooning ability of three rice varieties grown in varyaloha (Apr-Feb)season around Antananarivo (average of 10 hills in farmer's field).Variety Tillers (no.) Ratoons (no.)Rojofotsy (local)Rojofotsy mixtureNo. 1300 (japonica type)10.56.819.48.03.820.1Table 3. Local varieties mentioned as good for ratooning in different regions.Variety Region Culture typeRojofotsyMangakelyBotohavanaChianung-8TsipalaKalilaAndramotaMampanaTsimatahotrosaEengizaAntananarivoAntananarivoAntananarivoAntananarivoMarovoayMarovoayMarovoayMananjary (East coast)Mananjary (East coast)Mananjary (East coast)VaryalohaVaryalohaVaryalohaVakiambiatyJebyJebyJebyHosyJebyJebyplateau. Not all areas in the high plateau can grow a ratoon crop, but somemid-altitude (800-1,200 m) valleys can grow ratoon crops as fodder for animals.Varieties mentioned in Tables 1 and 2 can be used with proper managementpractices.Varieties for Marovoay region should have deepwater tolerance and goodratooning ability for the jeby season culture. Some local varieties such as Tsipala,Kalila, and Andramota can be used and some new tropical varieties such as IR44,TNAU 13613, CR 156-5021-207, and IET 3600 can be tested. Some of these varietiesare mentioned in Table 2.Varieties for the east coast need special consideration because rainfall is highertoward the north than the southeast. The temperature is most ideal for ricecultivation. In some areas a ratoon crop could produce as much as the main cropwith fertilizer management and varietal selection. Varieties should have strongdormancy, and disease and insect resistance. The east coast is known for pests and
134 RICE RATOONINGiron toxicity. As mentioned earlier, Denton (2) observed some local varieties beinggrown in ratoon cropping in Madagascar. There is need to survey these areas ingreater detail. Some of the local varieties mentioned in Table 3 can be used withnewly introduced varieties and supplemented by the following varieties — CICA-4,IR2061-462-2, IR2061-632-3-1, Intan, Labelle, IR4722-36-1, Milbuen 5, andIR2058-78-1-3-2-3.REFERENCES CITED1. Arraudeau M., and R. Dechanet. 1960-61, 1962-63, 1963-64. Rapport de Campagne, Institut deRecherches Agronomiques Tropicales et des Cultures Vivrieres/Institut de Recherches Agronomiquesde Madagascar station Agronomique de Lac.2. Denton, I.T. 1985. A trip report on the rice and legume germplasm collection in Malagasy DemocraticRepublic, April 15 to May 14, 1985. IRRI-International Board for Plant Genetic Resources Fieldcollector, International Rice Germplasm Center. IRRI P.O. Box 933, Manila, Philippines.3. Dobos, A. 1973. Report Societe Malagasy d’Amenagement du Lac Alaotra ferme experimentele bird,Experimentations agronomiques et difersification des cultures. lnstitut de Recherches AgronomiquesTropicales et des Cultures Vivrieres.
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RICERATOONING1988INTERNATIONAL RICE
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ContentsForewordWelcome 1OverviewRi
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Genetics and varietal improvementIn
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2 RICE RATOONINGthe main crop. Harv
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4 RICE RATOONINGTable 1. Area, prod
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6 RICE RATOONINGTable 2. Rice varie
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8 RICE RATOONING1. Effect of spacin
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10 RICE RATOONINGHowever, no signif
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12 RICE RATOONINGrelating to seed v
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14 RICE RATOONING5. Cultivars that
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Economic perspectivesof rice ratoon
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ECONOMIC PERSPECTIVES OF RICE RATOO
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32 RICE RATOONINGla) Developmental
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34 RICE RATOONINGCutting heightStub
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36 RICE RATOONINGEarly flooding enc
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38 RICE RATOONING2. Factors affecti
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40 RICE RATOONING27. Nair, N.R., an
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42 RICE RATOONING1. Changes in till
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44 RICE RATOONINGTable 2. Character
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46 RICE RATOONING9. International R
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48 RICE RATOONINGplot size is 6 row
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50 RICE RATOONINGimproved ratooning
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52 RICE RATOONINGTable 6. Simple co
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Utilization of rice ratooningby far
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RICE RATOONING IN RIO DE JANEIRO 57
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RICE RATOONING IN RIO DE JANEIRO 59
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Rice ratooningin the Dominican Repu
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RICE RATOONING IN THE DOMINICAN REP
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89111306514772Special points Refere
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72 RICE RATOONINGANDHRA PRADESHBasu
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74 RICE RATOONINGrice observed at t
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76 RICE RATOONINGTAMIL NADUBalasubr
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78 RICE RATOONING19. Reddy, T.G., M
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80 RICE RATOONING1. Rice-growing re
Page 89 and 90: 82 RICE RATOONING2. High cutting he
Page 91 and 92: 84 RICE RATOONINGTable 3. Yield tri
Page 94 and 95: Rice ratoon crop managementin the h
Page 96 and 97: RICE RATOON CROP MANAGEMENT IN KARN
Page 98 and 99: RICE RATOON CROP MANAGEMENT IN KARN
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Page 102: RICE RATOON CROP MANAGEMENT IN KARN
Page 105 and 106: 98 RICE RATOONING1. The Tungabhadra
Page 107 and 108: 100 RICE RATOONINGthe results of po
Page 109 and 110: 102 RICE RATOONINGTable 4. Effect o
Page 112 and 113: Ratoon rice researchin Karnataka, I
Page 114 and 115: RATOON RICE RESEARCH IN KARNATAKA 1
Page 116: RATOON RICE RESEARCH IN KARNATAKA 1
Page 119 and 120: 112 RICE RATOONINGTable 1. Area and
Page 121 and 122: 114 RICE RATOONINGonly 7.5-49.7% of
Page 123 and 124: 116 RICE RATOONINGTable 5. Relation
Page 126 and 127: Scope for rice ratoon croppingin th
Page 128 and 129: RATOON CROPPING IN NORTHEASTERN IND
Page 130 and 131: Scope for rice ratoon croppingin th
Page 132 and 133: RATOON CROPPING IN CENTRAL AND NORT
Page 134 and 135: RATOON CROPPING IN CENTRAL AND NORT
Page 136 and 137: Potential of rice ratooningin Madag
Page 138 and 139: RICE RATOONING IN MADAGASCAR 131a.
Page 142 and 143: Potential for rice ratooningin east
Page 144 and 145: RICE RATOONING IN EASTERN INDIA 137
Page 150 and 151: Ratooning in Bangladesh:prospects a
Page 152 and 153: RATOONING IN BANGLADESH 145RATOON C
Page 154 and 155: RATOONING IN BANGLADESH 147Table 4.
Page 156: RATOONING IN BANGLADESH 149OTHER FA
Page 159 and 160: 152 RICE RATOONINGTable 1. Hybrid s
Page 161 and 162: 154 RICE RATOONINGThe studies sugge
Page 163 and 164: 156 RICE RATOONINGVARIETIES AND CUL
Page 165 and 166: 158 RICE RATOONINGspikelet primordi
Page 167 and 168: 160 RICE RATOONINGTable 5. Effect o
Page 170 and 171: Agronomic principles and practiceso
Page 172 and 173: AGRONOMIC PRINCIPLES AND PRACTICES
Page 184 and 185: Rice ratooning: breeding,agronomic
Page 186 and 187: BREEDING, AGRONOMIC PRACTICES, AND
Page 188 and 189: BREEDING, AGRONOMIC PRACTICES, AND
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BREEDING, AGRONOMIC PRACTICES, AND
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BREEDING, AGRONOMIC PRACTICES, AND
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188 RICE RATOONINGwas the most effe
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190 RICE RATOONINGRESULTSMain crop
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192 RICE RATOONINGRatoon tiller reg
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194 RICE RATOONING9. Rister, M. E.,
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196 RICE RATOONINGExcept for rice w
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198 RICE RATOONINGInsect survivorsh
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200 RICE RATOONING1. Stem borer occ
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202 RICE RATOONING3. Population dyn
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204 RICE RATOONING2, 3). Microvelia
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206 RICE RATOONINGplant chemicals a
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208 RICE RATOONING17. Krishnamurthy
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210 RICE RATOONING1. Yellow dwarf c
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212 RICE RATOONING3. The effect of
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214 RICE RATOONINGAlthough the inte
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216 RICE RATOONINGTable 6. Sheath b
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Yellow dwarf disease in ratoon rice
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YELLOW DWARF DISEASE IN RATOON RICE
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228 RICE RATOONINGTable 1. Estimate
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Main crop a Ratoon crop b53.956.155
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Disease and insect pestsand their c
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DISEASE AND INSECT PESTS IN RICE RA
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DISEASE AND INSECT PESTS IN RICE RA
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Inheritance of ratooning abilityin
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INHERITANCE OF RATOONING ABILITY IN
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248 RICE RATOONINGShould the season
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250 RICE RATOONINGYield and yield-c
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252 RICE RATOONINGMain-crop photosy
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254 RICE RATOONINGShort-termGiven t
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Commercial ratoon rice productionin
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COMMERCIAL RATOON RICE PRODUCTION I
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0.180.200.490.250.160.270.390.350.3
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268 RICE RATOONING1. Path analysis
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270 RICE RATOONINGRecommendationsVa
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ParticipantsT. AhmedRice Experiment
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Varietal indexA200, 221Achra 108/1,
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VARIETAL INDEX 277IR2061-465-1, 12I
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VARIETAL INDEX 279RU7502006, 49, 51
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RICE RATOONING - IRRI books - International Rice Research Institute

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