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RICE RATOONING IN MADAGASCAR 131a. Asara, grown during December to May when rainfall is high and manyareas are flooded. Although altitude is low (20 m) and temperatures arefavorable, main constraint is water management.b. Atriatry, grown between February and August. The ratoon crop couldsuffer from drought.c. Jeby, grown between April and October. With appropriate varieties, aratoon crop which can mature before heavy rain comes could be grown.With varietal selection for deep water tolerance and tiller regeneration1. Rainfall distribution and temperature range in several major rice-producing areas ofMadagascar.
132 RICE RATOONINGability, a ratoon crop is possible during this season. Average maximum andminimum temperatures throughout the year remain between 24.3 and29.3 °C.2. High plateau. This is a large area of about 300,000 ha. Some intermediatehill valleys can grow a ratoon crop of rice, especially in an area around the nationalcapital, where they grow a first crop called varyaloha (April-February). Anadditional ratoon crop could be possible with Taiwanese and japonica type varieties.The main problem is excessive water accumulation in low-lying areas and lowtemperatures. In some valleys in the high plateau, especially in the Manjakandrianaarea, farmers demand ratooning varieties for animal feed. Lowland fields are mostlymonocropped because of poor drainage. It seems that the demand for palatable riceratoon fodder is growing and this can be met to a certain extent by selecting vigorousratooning types. In this area temperature is not enough for panicle formationbecause the rice crop is harvested during April and temperature goes down fastbeginning in May.Animal population in Madagascar is around 10 million, mostly zebu (cattle).Only with the varyaloha crop which is harvested during February is a ratoon croppossible because the temperature is right for panicle maturity. Average maximumand minimum temperatures range between 14.9 and 21.1 °C and reasonablevegetative growth of ratoons can be maintained.3. East Coast. The East Coast is blessed with good temperature and heavyrainfall. Annual rainfall is about 3,500 mm in 241 d per year and it graduallydecreases toward the south; in Manankara it is about 2,700 mm. Average maximumand minimum monthly temperatures range between 21.6 and 26.3 °C. Farmers growexcellent crop of vary-tavy (slash-and-burn upland) where there is no moisturestress. The area under different systems of culture is about 250,000 ha. This includesa vatomandry or rainy-season crop grown between December and May and adry-season crop hosy grown between June and November in Manankara andMananjary region in the east-south coast. In Manankara, Soanierana-Ivongo,Sainte-Marie, Ivoloina, Brick-a-ville, and Mahanoro in the Tamatave region, twocrops of lowland rice are grown. They are the rainy-season crop called asarake,grown between October and April, and ririnina, grown between May andNovember. Often, the second-season crop or the dry-season crop of some varieties isleft for ratooning. The east coast region can indeed be a good crop growing area withappropriate varieties and management practices. The east coast is also dotted byslash-and-burn (vary-tavy) upland rice; generally small hillocks (shifting cultivation)are used where water does not accumulate. Conventional upland rice is also grownon level surfaces.POSSIBLE VARIETIESVarietal requirements for the high plateau, the west coast, and the east coast differbecause of different ecological conditions in the regions. Cold-tolerant, shortduration,blast-resistant varieties with good ratooning ability are needed for the high
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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
Page 87 and 88: 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 140 and 141: RICE RATOONING IN MADAGASCAR 133Tab
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
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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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