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Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec32.121.7155.06.4147.0Table 2. Effects of sources of nitrogen and different insecticides on ratoon crop of Sona Mahsuri, Tungabhadra River Project.10.07.711.720.920.017.313.311.410.916.914.517.54.59.432.120.895.67.8139.52.154.722.712.111.250.932.721.271.501.321.801.210.220.5230.618.022.09.2129.00.920.901.232.22r.921.931.681.170.742.021.471.350.460.7429.315.34.38.7124.00.440.490.490.440.410.440.500.410.400.520.450.450.050.09Table 1. Weather parameters in the Tungabhadra River Project area.Maximum temp (°C)Minimum temp (°C)Av rainfall (mm)Av sunshine hoursPotential evapotranspiration30.2 16.0 1.8 9.9 136.4 33.7 18.6 4.3 10.6 154.0 37.0 31.8 4.4 10.4 186.0 38.8 24.4 13.9 10.2 204.0 42.3 24.7 33.9 9.5 218.8 35.123.189.26.2192.032.622.2121.84.5173.632.221.7118.25.1181.2Postharvest observationsRegenerated Stem1 mo of ratooning 2 mo after ratooningTreatment tillers girth Shoot Root Shoot Root Plant Tillers/ Panicles/ % sterility Yield Harvest(no.) (cm) wt/plant wt/plant wt/plant wt/plant ht plant plant (t/ha) index(g) (g) (g) (g) (cm)N 0 I 0N 0 l 1N 0 I 2N 0 l 1N 1 l 1N 1 l 2N 2 I 0N 2 l 1N 2 l 2N 3 I 0N 3 I 1N 3 I 2SE±CD (0.05)10.99.412.822.322.118.014.012.614.617.720.823.31.254.260.360.390.340.400.370.350.330.320.350.340.380.370.010.025.38.38.511.215.812.811.513.914.410.18.210.52.25.754.14.64.010.512.014.210.210.414.810.38.39.01.463.466.63.28.811.315.813.77.07.28.68.011.111.81.83.51.51.20.82.54.52.52.12.01.82.32.83.60.421.6043.947.749.063.964.360.050.448.848.356.653.356.84.27.812.711.314.720.126.324.017.414.213.320.723.619.86.70.98
100 RICE RATOONINGthe results of pot experiments because in all the treatments, Azolla was applied to themain crop. We stopped applying Azolla to the ratoon crops with zero N and50 kg N/ha treatments. During the autumn-winter months when the main crop wasgrown, the temperatures were favorable for the multiplication and development ofAzolla. Probably, the decomposition of Azolla resulted in green and vigorousratoon plants in all the pots. Even in those pots where Azolla was maintained in theratoon crop, the multiplication of Azolla slowed in March when the temperaturesstarted rising. Hence, application of Azolla to the ratoon crop in this region may notbe beneficial.We did field insecticidal trials with a ratoon crop of Sona Mahsuri. We usedfour fertilizer treatments and two insecticides with a control. The treatments aresummarized in Appendix 1.Azolla could not be uniformly maintained in the field because of fluctuatingwater level and snail damage. The higher temperatures during the ratoon cropseason may also be the reason for its poorer development and multiplicationparticularly in March-April. Soil salinity (pH = 8.3) may be another reason. The 50kg N/ha treatment gave the most regenerated tillers/plant and the highest ratoonyields. The ratoon tillers were vigorous and green, and exhibited delayed flowering.Tillering was poor in the control and better in plots treated with Azolla only(Table 2).Applying Azolla immediately after ratooning may not benefit the ratoon cropbecause Azolla N is not available to the plants until the Azolla decomposes. In thepot experiment, Azolla N was continuously available to the ratoon crop treated withAzolla only. This partially explains inconsistencies between pot and field experiments,but more experiments are required for conclusive results.Insecticide - nitrogen source interactionThere was no significant interaction between nitrogen source and insecticideapplication in relation to ratoon growth and development because there was no pestpressure in either crop. In the summer crop of Sona Mahsuri grown in farmers’fields, we observed BPH incidence. The canopy of the ratoon Sona Mahsuri crop inour experiment was not as thick as the farmers’ crop.There was significant variation in number of regenerated tillers, shoot androot weight, panicles/plant, and yield. Mineral nitrogen at 50 kg/ha gave the highestmean yield, 2.02 t/ha, in Sona Mahsuri (Table 2).Application of chemical herbicidesIn one herbicide experiment, chemical weedicides were applied to main and ratooncrops of Tellahamsa. Six weedicides were used at three concentrations, along withan unweeded check plot. The other two treatments were hand weeding twice duringthe crop growth and maintaining the plot weed-free. The treatment was repeated 1wk after ratooning (Appendix 2). Rice seedlings germinated from the fallen grainsand competed with the ratoon crop as weeds. Hand weeding was the most effectiveweed control method in the main and ratoon crops. Among weedicides, however,pendimethalin at all three concentrations checked weeds in both crops. Ratoon
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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
Page 55 and 56: 48 RICE RATOONINGplot size is 6 row
Page 57 and 58: 50 RICE RATOONINGimproved ratooning
Page 59 and 60: 52 RICE RATOONINGTable 6. Simple co
Page 62 and 63: Utilization of rice ratooningby far
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Page 68 and 69: Rice ratooningin the Dominican Repu
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Page 77 and 78: 89111306514772Special points Refere
Page 79 and 80: 72 RICE RATOONINGANDHRA PRADESHBasu
Page 81 and 82: 74 RICE RATOONINGrice observed at t
Page 83 and 84: 76 RICE RATOONINGTAMIL NADUBalasubr
Page 85 and 86: 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: 98 RICE RATOONING1. The Tungabhadra
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 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.
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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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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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