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Table 5. Comparative responses for grain yield (q/ha) to inbred progeny and half-sib family recurrent selection in BSK (Tanner and smith, 1987) and FSI-tnR (Horner, 1985). Cycle of selection BSK(S) Per se self BSK(S) x BSK(HI) Per se self BSK(HI) Per se self LSD (0.05) =7.9 q!ha co C4 C8 Qlange, " 48.- 27.7 48.7 27.7 48.7 27.7 62 39.0 61.6 40.8 52.9 31.9 6C 41.3 71.1 43.6 64.5 39.1 23.4 49.1 46.0 57.4 32.4 41.2 Testcross means Q'I x Q'I crosses 52 bulks FSI-tnR(S) FSI-tnR(TC) FSI-tnR(S) FSI-tnR(TC) FSI-tnR(S) FSI-tnR(TC) co Cl C3 b 49.1 49.1 47.1 47.1 50.0 51.5 49.4 52.8 55.0 55.5 56.1 56.8 31.6 26.9 1.9** 2.2** 3.4** 2.2** of the inbred progeny recurrent selection, but the responses for the self generation were similar to the populations per se. The results for grain yield, on a long-term basis, are not encouraging. BS16OO, for example, has a greater yield (47.1 q!ha) than BSl6C4 (44.9 q/ha), and the C4 (44.9 q/ha) had significantly lower yield than the C2 (53.9 q/ha). Other agronomic traits were considered in selection, and except for stalk lodging, the changes for the other traits were in the desired direction (Table 6). It seems that inbred-progeny recurrent selection must be used with caution. Inbredprogeny recurrent selection was effective for increasing resistance to important pests, but the Table 6. Responses to 51 and ~ recurrent selection in BS2, BSTL, and BS16 maize populations (Adapted from Iglesias and Hallauer. 1991). Cycles of Grain Days to Ear Lodging Population selection Yield Moisture flower hgt Root Stalk Per se Selted Q/ha " no. em ----- " BS2 CO 40.1 17 .5 71 121 18 22 C3 51.5 18.0 72 119 5 22 C5 49.1 17.8 70 104 3 21 BSTL CO 39.6 19.3 73 116 7 15 C3 52.2 18.6 72 113 4 17 C5 49.8 17.8 72 110 2 13 BS16 CO 47.1 19.8 74 133 10 21 C2 53.9 17.4 69 103 9 13 C4 44.9 16.3 69 101 3 16 BS2 CO 24.2 17 .2 75 96 12 17 C3 29.5 17.7 74 101 6 19 C5 30.2 17.7 73 104 12 f7 BSTL CO 23.4 18.3 75 101 5 12 C3 31.2 18.3 74 104 4 15 C5 30.7 18.0 73 96 2 10 BS16 CO 27.5 19.7 75 108 7 15 C2 26.1 17 .0 72 95 4 14 C4 30.0 16.9 70 86 2 15 LSD (0.05) 6.9 0.8 2 6 4 5 168
correlated effects were not desi rable (Tables 3 and 4). Inbred-progeny recurrent selection in 852, 85TL, and 8516 was effective initially for grain yield, but response for increased grain yield plateaued after the C2 and C3 cycles of selection. 852, BSTL, and 8816 included 50, 25 and 1~ exotic germplasm, respectively, and either the methods of selection used were not satisfactory or the genetic load of the exotic germplasm was too great to real i ze long-term response to inbred-progeny recurrent selection. Effective population sizes (20 to 25) may have been too small, and too many alleles were fixed either because of inbreeding and/or because of genetic drift. The lack of continued response by inbred-progeny recurrent selection, however, is not limited to populations with exotic germplasm because a similar response was obtained in BSK (Table 5), which is a strain (Krug) of Reid YellCW
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Proceedings of the Fifth Asian Regi
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Page Foreword List of participants
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For several years, the Asian countr
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LAOS MALAYSIA MYANMAR NEPAL PAKISTA
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Chamnan Chutkaew Dept. of Agronomy
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I t· PRIVATE PRIVATE SECTOR: SECTO
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Pioneer Overseas Corp. ProAgro Seed
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MP COP NGOs TK = Muriate of Potash.
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Table 3. Land suitability for maize
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Depending on how this wheat is rele
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Individual field sizes in the GKF a
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Table 12. Demonstration block resul
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alance of composite, synthetics and
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Elias, S.M., F.S. Sikder and J.Ahme
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~IZE ItAIMJ4ENT PRXJW4ME IN IHlf'AN
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3. Low level of soil fertility. Exp
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3. Farmers could not afford to purc
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Table 1. Hybrid maize production in
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100,000 mu (1 ha = 15 mu). Fran 198
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+ The planting area of inbred line
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ty levels. Selection interia should
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Dao13, Oa19, SSE232 etc.). b. combi
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~ZE I~ IN IN>IA - AN OVERVIEW WITH
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inbred 1ines possessing good genera
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Table 3. Details of medium and earl
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increasing the yield levels of the
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Production of ~zygous diploid inbre
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EntQllOlogical research. In the fie
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A 1) OUr coordinated efforts for ma
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Table 1. Maize area harvested, proW
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Table 4. Grain yield of Semar 1 and
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ut they have been selecting ears fr
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MAIZE ~ N«J ~ION IN LAOS. Kanyavon
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to rice in order to reach self-suff
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0\ 0\ ."'0- ~I.u'. u: 0 50 100 STAT
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. According to the findings of the
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IR:EDIIIG IHJ N:RHJotIC RESEAfDI C
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tion with estate or mini-estate typ
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Table 4. MYR grain maize yields ove
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techniques. References Anonymous. 1
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Table 1. Total area under maize and
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Year Township Area planted Total pr
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cover, short plant stature, and sat
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Table 3. Res.Stat. Multilocational
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3. Plant protection: a. Diseases Th
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Questions to the author: FROM: S. K
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were unacceptable in some parts due
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Table 2. CCRI maize hybrid yield tr
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HYBRID MAIZE BREEDlt.G AN> ALH»DII
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of highly productive technologies,
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Maize varietal improvement continue
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Peronosc lerospora phi 1ippinensis
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elow to help clarify the farm level
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Premium Grade (emulsifiable concent
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support. The versatile planter/fert
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Table 1. Climatic conditions in the
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T1l1t:i----------------------------
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the maha season. Yala season is cha
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. Spacing Blackgram Maize 40 em x 5
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Sri Lanka. Ariyanayagam, R. P. 1967
Page 124 and 125: It took almost 10 years to develop
Page 126 and 127: g; CUS0 4 (5H 2 0): 0.39 g; NaF: 0.
Page 128 and 129: 3. Making single cnosses: Plant the
Page 130 and 131: experiments showed that the fertili
Page 132 and 133: Long term evaluation of mass releas
Page 134 and 135: Chang, S.C., and Y.Z. Wu. 1976. Pra
Page 136 and 137: DEVELCHENT OF HYBRID ~ IN THAILAN>
Page 138 and 139: Table 2. Quantity and value of Thai
Page 140 and 141: was approved by KU and OOA in 1991
Page 142 and 143: Table 8. Mean yields of fresh dehus
Page 144 and 145: 4. Prevention and control of aflato
Page 146 and 147: Table 17. Mean grain yield and agro
Page 148 and 149: Sittipanuwong, S., C. Chutkaew, A.
Page 150 and 151: Early rainy season plantings have a
Page 152 and 153: P. R.CHINA TMilAKD CAMPUCHiA
Page 154 and 155: In 1992, the hybrid maize acreage i
Page 156 and 157: organizing visits as well as field
Page 158 and 159: Table 1 Area, production and yield
Page 160 and 161: plants per hill) 4. Intercropping e
Page 162 and 163: VIEl1'W4 YELLOW MAIZE EXRRT: MARKET
Page 164 and 165: 6,------------------~3,5 Producllon
Page 166 and 167: MAIZE BREEDUG Arnel R. Hallauer-L!
Page 168 and 169: method was provi ded by Eberhart (1
Page 170 and 171: can vary by the complexity of inher
Page 172 and 173: Table 3. Response to selection for
Page 176 and 177: increased response for grain yield.
Page 178 and 179: Sure Crop (0h43 and C103). several
Page 180 and 181: Sprague and Tatum (1942) demonstrat
Page 182 and 183: Horner, E.S., E. Magloi re, and J .
Page 184 and 185: evaluation are conducted in only on
Page 186 and 187: Table 1. Maize: Production Unit 100
Page 188 and 189: Table 3. Maize: Area harvested Unit
Page 190 and 191: v) Incentives to private sector are
Page 192 and 193: possible through adoption of suitab
Page 194 and 195: will be described highlighting thos
Page 196 and 197: will fluctuate. As a general rule,
Page 198 and 199: help of maize breeders from the nat
Page 200 and 201: Table 4. Possible heterotic partner
Page 202 and 203: use as OPVs and broad based synthet
Page 204 and 205: c. Integrat;on of populat;on ;mprov
Page 206 and 207: Table 8. Announced CIMMYT lines 199
Page 208 and 209: HYBRID MAIZE ~ 1l£ SMALL-SCALE FNI
Page 210 and 211: Table 2. Growth rate of maize area
Page 212 and 213: At the same time that CIMMYT was sh
Page 214 and 215: when grown under farmers' condition
Page 216 and 217: seed often varies substantially bec
Page 218 and 219: kilograms of maize grain that must
Page 220 and 221: Table 8. COst of producing, process
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J i-----1'-_.,-_I........ i M*iIBia
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egions which do not allow a suffici
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participation; where foreign compan
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Wellhausen, E.J. Walden (ed.) 1978.
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To recover value, seed companies ca
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In recent years, many new companies
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nology and its reliance on patents,
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Table 6. Intellectual property righ
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for crop improvement programs. It i
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capabi 1ities Despite these constra
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TftNlAlll CAMPUCI-1iA Fig. 1. Seven
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* Yield potential of 8.0 t/ha. II.
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CAOOILL MAIZE RESEAFDI ACTIVITIES I
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RESEARCH AN> POTENTIAL OF HYBRID (X
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ClBA SEEDS IN SJJ11£AST ASIA. Jose
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ACTIVIlY OF MAHYOO IN INJIA Rajendr
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PACIFIC SEEDS - PlANT ~ FOO ASIA Pe
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Questions to the author: FROM: R. S
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Just start In 1980 the demonstratio
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VOLUME 1000 IQnt/ 10.--------------
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(Notes by Dr. V.L. Chidley, Raporte
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1. Rhizoctonia leaf and sheath blig
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