RICE RATOONING - IRRI books - International Rice Research Institute

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RATOONING IN BANGLADESH 145RATOON CULTIVATION CONSTRAINTSRice ratooning has not yet been accepted in Bangladesh. The major constraints are:• lack of good ratooning varieties,• lack of dependable irrigation water sources,• poor grain quality,• low yields of ratoon crops,• insect and disease problems,• low temperature following t. aman harvest,• higher labor costs for harvesting a main crop that will be ratooned, and• lack of attractive income potential from ratooning.POTENTIAL FOR RATOONING THE BORO MAIN CROPRatooning of the boro crop offers the most attractive opportunity. Boro is generallyharvested in April and May, when the average minimum temperature is about 27 °Cand the maximum 37 °C, and when total rainfall varies from a minimum of 200 mmto a maximum of 800 mm/mo (Fig. 1).Rainfall after the boro harvest is an important determinant of ratooningpotential. All boro rice is irrigated, with the water usually delivered on contract.After boro harvest, the irrigation contracts end when pumps and tubewells aredecommissioned. Then, land is either prepared for transplant aus rice, planted togreen manure, transplanted to b. aman, or kept fallow for a single t. aman crop(Table 3). Farmers could grow ratoon rice on flood-free sites as an alternative togreen manure or fallow during the early aus season, if a good-ratooning, highyieldingboro variety were available.A recent study of the grain yield potential of main crop, relay crop, and ratooncrop in boro and aus examined the total productivity of a given area. CombinationsTable 3. Agroeconomic productivity of long-term irrigated rice-based cropping patterns atdifferent agroclimatic regions of Bangladesh.Boro Aus T. amanTotal fieldduration (d)Yield (t/ha)Totalnet returnBoro T. aus T. aman (Tk/ha) aBR3 –Gram –Wheat –BR3 –BR1 –Wheat –BR3 –BR3 –Gram –Wheat –Green manureBR3BR1FallowBR1BR1Green manureFallowBR9BR9– BR4– BR11– BR10– Pajam– BR10– BR10– BR11– BR11– BR11– BR11Joydebpur288308308245Rajshahi273316238Comilla–––5.20.83.14.53.13.46.06.00.51.1–4.92.8–2.83.6––3.13.54.44.64.73.84.24.55.05.24.74.428887442004377524780429685695650997256731098310651kg, BR10 = Tk.580/kg, BR11 = Tk.5.80/kg, Pajam = Tk.6.00/kg, Wheat = Tk.5.40/kg, Gram =a Price of crops at time of harvest: BR1 = Tk.5.30/kg, BR3 = Tk.5.35/kg, BR4 = Tk.5.80/Tk. 10.00/kg. 1 US$ = Tk.30.35 (as of July 1986).
146 RICE RATOONING1. Rice cropping season based on monthly average maximum rainfall andminimum air temperature in lowland areas.of main, relay, and ratoon crops of BR3, Pajam II, and Baspati varieties were tested.When ratooning was tested, the main crop was harvested at 15 cm stubble height.The combination of main boro crop followed by ratoon crop produced thelowest yield. But, it occupied the field only 130 d. Main crop with no ratoonproduced the highest yield, followed by combinations of main crops ratooned, thenrelayed (Table 4). Highest ratoon yield (2.4 t/ha) was obtained from Pajam II(improved variety), followed by Baspati (local variety) (1). Two main crops duringboro and aus do not allow optimal t. aman yields. Boro, ratoon aus, and t. amanmight be a good pattern with boro and t. aman as the main crops.POTENTIAL FOR RATOONING THE AUS MAIN CROPAfter aus harvest, about 85% of the cultivated land is transplanted to aman rice(Fig. 1, 2). There is little scope for ratooning the aus crop because the crop itselfgenerally has a low yield.
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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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RICE RATOON CROP MANAGEMENT IN KARN
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23123722821721922222421423122421722
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 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 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 192: BREEDING, AGRONOMIC PRACTICES, AND
Page 195 and 196: 188 RICE RATOONINGwas the most effe
Page 197 and 198: 190 RICE RATOONINGRESULTSMain crop
Page 199 and 200: 192 RICE RATOONINGRatoon tiller reg
Page 201 and 202: 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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