RICE RATOONING - IRRI books - International Rice Research Institute

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133232424733-67–564513-46––––Both MC and RCwere fertilized.Fertilizer to RCincreased onlystraw yield withoutsignificant increasein grain yield.No cultural managementof fertilizerapplication – onlySupplemental irrigation provided. Inanother experimentRC responded tofertilizer application.Ratoon cropping issuitable for lowlandareas where flood orsudden water stagnationhampersfresh planting duringwet season.(5)(5)(5)(5)(15)(4)(8)(8)(8)(8)(6)(6)(6)(6)Tamil NaduCoimbatore1968ADT 27––423.80.5CoimbatoreCoimbatoreCoimbatoreCoimbatore1968196819681969CO 32IR8JSIR8–––1 46–––69434043474.74.43.13.01.51.41.31.4Uttar PradeshWest BengalKarimganjKalyanlKalyanlKalyanlKalyanl––1980-811980-811980-81(14 genotypes)(9 genotypes)IET 3629IET 4555(6 genotypes)114-124–14014013040-5460-70959510131-43–6868782.6-4.1–4.84.73.1-4.51.3-2.10.2-0.52.72.10.4-1.8ChinsurahChinsurahChinsurahChinsurah1981-821981-821981-821981-82SR26BFR13ATilakkachariAchra 108/1––––––––––––––––2.53.05.04.8aMC = main crop, ratoon crop.
72 <strong>RICE</strong> <strong>RATOONING</strong>ANDHRA PRADESHBasumathi, Jeerige sanna, Sugadas, and Kakirekkalu rices studied in 1956 atRajendranagar, Hyderabad, produced ratoon yields 6-111% of the main crop yieldin half the main crop duration, the highest ratoon yield being 1 t/ ha, in Jeerige Sanna(16). Fertilized plots yielded higher than unfertilized ones and the varietiesresponded differentially to N levels.ASSAMDas and Ahmed (4) evaluated 89 photoperiod-insensitive semidwarf varieties atKarimganj, Assam, for main and ratoon crop yields. The main crop receivedcomplete fertilizer at 60 kg N, 13.2 kg P, and 24.90 kg K/ha but the ratoon cropreceived only N at 30 kg/ha, topdressed immediately after cutting the main crop at30 cm stubble height. The ratoon crop yields ranged from 9.4 to 68.1% of main cropyields with an average of 37.2%; the average ratoon crop duration was 39.6% of themain crop. The best performing C 3810 produced the highest main crop yield(4.1 t/ ha in 124 d) and the highest ratoon crop yield (2.1 t/ha in 54 d), followed byCR 220-60 and CR 156-5021-307.BIHARAs reviewed earlier (11), two experiments were carried out to determine the yieldsobtainable from ratoon crops of rice and the effect of date of transplanting and rateof manuring on ratoon crops. In the first experiment, NP 97 rice yielded 1.8 t/ha in120 d (Table 1). The ratoon crop harvested in 60 d yielded 0.6 t/ha without N;addition of 10 and 20 kg of N/ha produced 0.7 and 0.8 t of grain/ha. In a secondexperiment the same year, NP 125 rice was transplanted to manured fields on 1, 15,and 30 Jun. The highest yield from the ratoon crop (0.7 t/ha) was obtained fromplants transplanted on 1 Jun and the lowest (0.4 t/ ha) from those transplanted on30 Jun, indicating regression of ratoon crop yield on the planting time of the maincrop.KARNATAKAIn Karnataka, the first report on ratooning, published in 1943 (1), stated that thevariety S 684 gave a main crop yield of 2.7 t/ha in 174 d and a ratoon crop yield of1 t/ ha in 113 d, the ratoon crop taking 65% of the main crop duration but producing37% of the main crop yield (Table 2). Subsequent reports in the 1970s mostlyemphasized the success of this system on hill valley bottoms and midlands, whereseasonal inadequacies (short interval of rice fallows and moisture) prevented raisingan upland crop or a newly planted rice crop. The excellent ratooning ability of Intan
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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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Page 39 and 40: 32 RICE RATOONINGla) Developmental
Page 41 and 42: 34 RICE RATOONINGCutting heightStub
Page 43 and 44: 36 RICE RATOONINGEarly flooding enc
Page 45 and 46: 38 RICE RATOONING2. Factors affecti
Page 47 and 48: 40 RICE RATOONING27. Nair, N.R., an
Page 49 and 50: 42 RICE RATOONING1. Changes in till
Page 51 and 52: 44 RICE RATOONINGTable 2. Character
Page 53 and 54: 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: 89111306514772Special points Refere
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 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
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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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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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