Open-pollinated maize varieties: (Record no. 7321)

000 -LEADER
fixed length control field 03863nam a22004817a 4500
001 - CONTROL NUMBER
control field 80084
003 - CONTROL NUMBER IDENTIFIER
control field MX-TxCIM
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20191010225724.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 121211s ||||f| 0 p|p||0|| |
020 ## - INTERNATIONAL STANDARD BOOK NUMBER
International Standard Book Number 970-648-120-6
040 ## - CATALOGING SOURCE
Original cataloging agency MX-TxCIM
072 #0 - SUBJECT CATEGORY CODE
Subject category code E16
072 #0 - SUBJECT CATEGORY CODE
Subject category code F01
090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN)
Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) CIS-4154
110 0# - MAIN ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) Kenya
100 1# - MAIN ENTRY--PERSONAL NAME
9 (RLIN) 832
Personal name Pixley, K.V.
Miscellaneous information Genetic Resources Program
Field link and sequence number INT1617
245 00 - TITLE STATEMENT
Title Open-pollinated maize varieties:
Remainder of title a backward step or valuable option for farmers?
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Place of publication, distribution, etc. Nairobi (Kenya)
Name of publisher, distributor, etc. KARI|CIMMYT :
Date of publication, distribution, etc. 2002
300 ## - PHYSICAL DESCRIPTION
Extent p. 22-28
340 ## - PHYSICAL MEDIUM
Material base and configuration Printed
520 ## - SUMMARY, ETC.
Summary, etc. Maize farmers require varieties appropriate to their anticipated level of investment in inputs and ,with high probability of producing an acceptable grain yield when challenged by common biotic and abiotic constraints. The objectives of this study were to quantify the relative genetic advantage of hybrids over OPVs under a range of growing conditions typical for farmers in southern and eastern Africa, both when first- or second-generation ("recycled") seed is used, and to investigate scenarios under which hybrids or OPVs are the more profitable option for farmers. In our first experiment, we found that four elite hybrids consistently produced about 18%. more grain yield than 10 improved elite OPVs when grown at 16 sites with mean yield between 1.8 and 7.3 t ha-l. We proceeded to examine the consequences of recycling or saving grain from hybrid or OPV maize crops for use as seed for subsequent crops. Trials at five sites in Zimbabwe compared planting of FI seed and F2 grain of 10 commercial hybrids, FI and F2 of 10 topcross hybrids (using an OPV as male for a single cross), and F2 and F3 of 10 OPVs. Use of the advanced generation grain instead of Fl (F2 in the case of OPVs) seed resulted in 32%. average yield loss for hybrids, 16% yield loss for topcrosses and 5% yield loss for OPVs. We used these results to conduct simple break-even yield analyses to identify scenarios where use of OPV rather than hybrid varieties might be economically advantageous. We concluded that in some farming systems, particularly where yield levels are low (e.g. below 1.5 t ha-l) and hybrid seed and fertilizer prices are high relative to price of grain, highest return to investment may result from use of improved OPV seed, which is cheaper than hybrid seed and can be recycled with little or no yield loss. The improved OPVs are particularly advantageous if the money saved by using OPV instead of hybrid seed is used to purchase additional inputs such as fertilizer, herbicide or hiring additional labor. Although use of OPV instead of hybrid seed is a backward step in terms of expected grain yield, improved OPVs represent an economical option for resource-poor maize farmers in marginal areas or when hybrid seed and fertilizer prices are high relative to price of grain.
536 ## - FUNDING INFORMATION NOTE
Text of note Genetic Resources Program|Research and Partnership Program
546 ## - LANGUAGE NOTE
Language note English
591 ## - CATALOGING NOTES
Affiliation 0409|AGRIS 0401|AL-Maize Program
594 ## - STAFFID
StaffID INT1888|INT1617
595 ## - COLLECTION
Collection CIMMYT Staff Publications Collection
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Crop yield
9 (RLIN) 1066
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Economic analysis
9 (RLIN) 1088
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Experimentation
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Farmers
9 (RLIN) 1654
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Fertilizers
9 (RLIN) 1111
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Growth
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Maize
9 (RLIN) 1173
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Pollination
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Varieties
9 (RLIN) 1303
653 0# - INDEX TERM--UNCONTROLLED
Uncontrolled term CIMMYT
653 0# - INDEX TERM--UNCONTROLLED
Uncontrolled term KARI
650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM
9 (RLIN) 1151
Topical term or geographic name as entry element Hybrids
Miscellaneous information AGROVOC
700 1# - ADDED ENTRY--PERSONAL NAME
Personal name Friesen, D.K.|Palmer, A.F.E.
700 1# - ADDED ENTRY--PERSONAL NAME
9 (RLIN) 834
Personal name Banziger, M.
Miscellaneous information Research & Partnership Program
Field link and sequence number INT1888
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type Conference proceedings
Holdings
Withdrawn status Lost status Damaged status Not for loan Collection code Permanent Location Current Location Date acquired Full call number Barcode Date last seen Copy number Price effective from Koha item type
  Not Lost     CIMMYT Staff Publications Collection CIMMYT Knowledge Center: John Woolston Library CIMMYT Knowledge Center: John Woolston Library 2015-02-10 CIS-4154 630201 2015-02-10 1 2015-02-10 Conference proceedings
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Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Lunes –Viernes 9:00 am. 17:00 pm. Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org