RICE RATOONING - IRRI books - International Rice Research Institute

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RATOON CROPPING IN CENTRAL AND NORTHERN INDIA 127In case of continuous rains in July, the grains of summer rice germinate on thepanicle itself. Evolving summer varieties with at least 15 d seed dormancy would be astep toward increasing the area under summer rice and thereby increasing the scopefor rice ratooning.I explored the possibility of growing three consecutive crops of rice followedby wheat in a multiple cropping sequence in north Bihar. Three crops of rice weretaken in succession between April and November. The first crop (CR44-35) wastransplanted on 6 Apr using 35-d-old seedlings; harvested on 30 Jun, it yielded4 t/ha. The second crop (Pusa 33), transplanted on 4 Sep, yielded 3.5 t/ha. Forthe third crop, 60-d-old normal and double-transplanted seedlings of BR8(photoperiod-sensitive) were transplanted at closer spacing (15 × 10 cm). The cropwas harvested on 30 Nov (vacating the land for the succeeding wheat crop) and thedouble transplanted (kharuhan) rice crop yielded about 4 t/ha.The farmers’ acceptance of the new cropping pattern rice (summer) - rice (earlykharif) -rice (late kharif) - wheat is, however, yet to be ascertained. Ratoon croppingafter summer rice may replace the transplanted early kharif rice and make the abovenewly developed cropping pattern less labor-intensive and acceptable to farmers.In some areas, a rice (summer) - rice (kharif) -wheat rotation is followed: here,ratoon cropping of summer rice may replace kharif rice, provided yields andeconomics of the two remain comparable. In another situation, farmers wish to gettheir land vacated by September for early planting of winter crops like early potato,chillies, autumn-planted sugarcane, winter maize, pea, toria (Brassica campestrisvar. toria), berseem (Egyptian cloves), and winter vegetable. They often do so byadvancing the date of sowing/ transplanting of early kharif rice by a month or so.Growing of summer rice and its ratoon in such a situation would increase the totalrice production without affecting timely planting of winter crops.Summer rice and its ratoon may also find place in flood-affected areas likeWest Champaran District in Bihar. Seedlings of newly transplanted tall indica riceget uprooted by the swift current of the floodwater from rivulets originating from thenearby mountains. A rice ratoon crop, because of its good anchorage, may resistuprooting by the swift current.There are some winter rice (locally called boro) areas in which ratoon croppingmight be possible. In Purnea and Katihar Districts of Bihar and parts of WestBengal, winter rice (photoperiod-insensitive) is becoming popular. There are somewaterlogged areas in this belt where kharif and rabi (winter-spring) crops are notfeasible. In these areas, seeds of winter rice are sown in the nursery-bed in October,when temperatures are favorable for seedling growth. Seedlings are allowed toremain in the nursery-bed until December and transplanted in January. Theseedlings pick up growth with the rise in temperature, and the crop matures by theend of May. It is possible to take a ratoon of this winter rice between June and July,before the land is again flooded. In these areas, winter rice is being taken even onmedium lowlands. Seedlings of winter rice are transplanted in January-Februaryand harvested in May-June and then tall indica rice is transplanted in standing waterin July. Hence, it might be possible to take a ratoon crop of winter rice in betweentwo rice crops.
128 <strong>RICE</strong> <strong>RATOONING</strong>In multiple cropping areas, working out the economics of rice ratoon croppingalone would not be enough; rather, each cropping pattern that will involve riceratoon needs to be compared (as a whole) with existing cropping patterns in theseareas, to assess the scope for increasing ratoon rice cropping.REFERENCES CITED1. Saran, A.B., and M. Prasad. 1952. Ratooning in paddy. Curr. Sci. 21(8):223-224.2. Saran, S., M.Q. Azam, and S.P. Sahu. 1959. A note on the differential behaviour in the ratooningability of some photoperiod-insensitive rice genotypes. J. Appl. Sci. 1(1):46-48.
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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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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
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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 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.
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
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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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RICE RATOONING - IRRI books - International Rice Research Institute

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