RICE RATOONING - IRRI books - International Rice Research Institute

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SCREENING FOR RATOONING ABILITY IN KARNATAKA 267Table 2. Correlation coefficients among main crop characteristics with ratoonyield.Days to Main crop Ratoon cropTillers/plant 50% yieldyieldflowering (ha)(ha)Tillers/plantDays to 50% floweringMain crop yieldRatoon crop yield1.00 0.111.000.350.341.000.300.46*0.58**1.00r = main crop flowering duration/ratoon flowering duration = 0.14.Table 3. Correlation coefficients among ratoon characters with ratoon yield.Days to50%floweringRegenerated Ratoon Panicles/ 1000- Ratoontillers ht Plant grain yieldwtDays to 50% floweringRegenerated tillersRatoon heightPanicles/plant1000-grain weight0.46* 0.330.230.050.340.060.310.010.24-0.55**0.38*0.88**0.38*0.290.35*The ratoon crop stand was impressive in cultivar BPT-2685, which had darkgreen leaves, probably due to high N content. We did not observe any significantassociation between days to flowering in the main crop and in the ratoon crop. Mostdry matter in the ratoon crop accumulated in shoots, but ratooning ability wasdependent upon higher root weight and volume. This supports the conclusion ofChauhan et al (1) that IR44 ratoon tillers are dependent on the main crop rootsystem until at least 21 d after harvest.Grain filling was excellent in many cultivars and ratoon stands of manygenotypes were as good as the main crop stand. Genotypes such as BPT-2226,BPT-2685, IET-7431, and KMS-5914 had superior ratoon crop stands. Many ofthem are late maturing and can be exploited for ratooning.In the main crop, a large variability was observed in tillers/plant, days toflowering, and yield. In the ratoon crop, variability was observed in number ofregenerated tillers, root and shoot weights, days to flowering, yield, 1000-grainweight, and germination percentage,There was 40-50% reduction in days to 50% flowering of the ratoon cropcompared to the main crop. Similarly, ratoon crop yields ranged from 3.17 to71.24% of the main crop yields. The harvest index ranged from 0.16 to 0.49 in theratoon crop, which is indicative of biomass production along with its compartmentalizationbetween grain and straw (Table 1).Correlation coefficients between grain yields of main and ratoon crops werehighly significant (Table 2) ( r =0.58). However, the main crop flowering duration didnot affect ratoon flowering duration. Among the ratoon characters, number ofregenerated tillers had the highest association with ratoon yield ( r =0.88) (Table 3).The path analyses revealed that main crop yield and number of regeneratedtillers had higher direct effect on ratoon crop yields (Fig. 1, 2).
268 RICE RATOONING1. Path analysis showing influence of some main-crop characters on ratoon yield.FUTURE RESEARCH NEEDSWe have compared the grain quality of the ratoon crop with that of the main crop.We have also compared the quality of the ratooning genotypes. Percentage ofbroken rice was higher in the ratoon crop grains. The cooking quality of the ratoonrice was on par with that of the main crop. If ratooning is to be accepted in theTungabhadra River Project, the ratoon crop must have comparable grain yields andquality to the present cultivars.We have only limited genetic stock for ratoon evaluation, but we hope toinclude more genotypes in the future. Breeding programs to evolve genotypes forthis agroecological zone should also include evaluation for ratooning ability.Genetic divergence studies utilizing ratooning-related parameters have beeninitiated to identify genotypes with diverse backgrounds, and many crosses betweenthese genotypes will be evaluated.CONCLUSIONSBecause of the dwindling reservoir capacity to sustain a second rice crop duringsummer months, great potential exists for rice ratooning in the Tungabhadra RiverProject. Genotypes with economic ratoon yields must be identified if ratooning is to
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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
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82 RICE RATOONING2. High cutting he
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84 RICE RATOONINGTable 3. Yield tri
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Rice ratoon crop managementin the h
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RICE RATOON CROP MANAGEMENT IN KARN
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23123722821721922222421423122421722
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98 RICE RATOONING1. The Tungabhadra
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100 RICE RATOONINGthe results of po
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102 RICE RATOONINGTable 4. Effect o
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Ratoon rice researchin Karnataka, I
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RATOON RICE RESEARCH IN KARNATAKA 1
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RATOON RICE RESEARCH IN KARNATAKA 1
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112 RICE RATOONINGTable 1. Area and
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114 RICE RATOONINGonly 7.5-49.7% of
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116 RICE RATOONINGTable 5. Relation
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Scope for rice ratoon croppingin th
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RATOON CROPPING IN NORTHEASTERN IND
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Scope for rice ratoon croppingin th
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RATOON CROPPING IN CENTRAL AND NORT
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RATOON CROPPING IN CENTRAL AND NORT
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Potential of rice ratooningin Madag
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RICE RATOONING IN MADAGASCAR 131a.
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RICE RATOONING IN MADAGASCAR 133Tab
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Potential for rice ratooningin east
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RICE RATOONING IN EASTERN INDIA 137
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Ratooning in Bangladesh:prospects a
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RATOONING IN BANGLADESH 145RATOON C
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RATOONING IN BANGLADESH 147Table 4.
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RATOONING IN BANGLADESH 149OTHER FA
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152 RICE RATOONINGTable 1. Hybrid s
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154 RICE RATOONINGThe studies sugge
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156 RICE RATOONINGVARIETIES AND CUL
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158 RICE RATOONINGspikelet primordi
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160 RICE RATOONINGTable 5. Effect o
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Agronomic principles and practiceso
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AGRONOMIC PRINCIPLES AND PRACTICES
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Rice ratooning: breeding,agronomic
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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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Page 226 and 227: Yellow dwarf disease in ratoon rice
Page 228 and 229: YELLOW DWARF DISEASE IN RATOON RICE
Page 230 and 231: YELLOW DWARF DISEASE IN RATOON RICE
Page 232: YELLOW DWARF DISEASE IN RATOON RICE
Page 235 and 236: 228 RICE RATOONINGTable 1. Estimate
Page 237 and 238: Main crop a Ratoon crop b53.956.155
Page 240 and 241: Disease and insect pestsand their c
Page 242 and 243: DISEASE AND INSECT PESTS IN RICE RA
Page 244 and 245: DISEASE AND INSECT PESTS IN RICE RA
Page 246 and 247: Inheritance of ratooning abilityin
Page 248 and 249: INHERITANCE OF RATOONING ABILITY IN
Page 250 and 251: INHERITANCE OF RATOONING ABILITY IN
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Page 255 and 256: 248 RICE RATOONINGShould the season
Page 257 and 258: 250 RICE RATOONINGYield and yield-c
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Page 264 and 265: Commercial ratoon rice productionin
Page 266 and 267: COMMERCIAL RATOON RICE PRODUCTION I
Page 268 and 269: COMMERCIAL RATOON RICE PRODUCTION I
Page 270: COMMERCIAL RATOON RICE PRODUCTION I
Page 273: 0.180.200.490.250.160.270.390.350.3
Page 277 and 278: 270 RICE RATOONINGRecommendationsVa
Page 280 and 281: ParticipantsT. AhmedRice Experiment
Page 282 and 283: Varietal indexA200, 221Achra 108/1,
Page 284 and 285: VARIETAL INDEX 277IR2061-465-1, 12I
Page 286: VARIETAL INDEX 279RU7502006, 49, 51
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