MARC details
| 000 -LEADER |
|---|
| fixed length control field |
02963nam a22002897a 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
|---|
| control field |
MX-TxCIM |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
|---|
| control field |
20260123153440.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
|---|
| fixed length control field |
260121s2025 ||||op||||00||0|eengdd |
| 040 ## - CATALOGING SOURCE |
|---|
| Original cataloging agency |
MX-TxCIM |
| 041 ## - LANGUAGE CODE |
|---|
| Language code of text/sound track or separate title |
eng |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
|---|
| Personal name |
Mulungu, K.H. |
| Field link and sequence number |
001714131 |
| Miscellaneous information |
Sustainable Agrifood Systems |
| 9 (RLIN) |
33325 |
| 245 10 - TITLE STATEMENT |
|---|
| Title |
Variety age and maize yield in Zambia : |
| Remainder of title |
climate-smart benefits of varietal turnover under production stress |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
|---|
| Place of publication, distribution, etc. |
[Mexico : |
| Name of publisher, distributor, etc. |
CIMMYT, |
| Date of publication, distribution, etc. |
2025] |
| 300 ## - PHYSICAL DESCRIPTION |
|---|
| Extent |
42 pages |
| 500 ## - GENERAL NOTE |
|---|
| General note |
Open Access |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc. |
Agricultural productivity growth in sub-Saharan Africa has stagnated despite sustained investments in crop improvement research, with maize yields showing concerning signs of decline since the 2000s. This study examines whether slow varietal turnover (the replacement of older varieties with newer improved varieties) constrains productivity growth in Zambian maize systems. Using nationally representative panel data spanning 2012-2019 and covering 11,065 plot-level observations from 8,369 households, we estimate the relationship between variety age and yield while controlling for household and plot characteristics through fixed and random effects models. First, we find that female-headed households use varieties 2-3 years older on average, pointing to equity concerns in variety access. Our analysis reveals that each additional year of variety age reduces maize yields by 8.5-20 kg/ha depending on model specification. These effects are substantially larger than previously documented in African contexts. Our results are robust to different causal identification strategies. The effects are highly heterogeneous across production conditions, with newer varieties providing greatest yield advantages under drought stress, late planting, low fertilizer application, and high temperatures, demonstrating successful incorporation of climate-smart traits in recent breeding efforts. However, newer varieties do not outperform older ones under pest and disease pressure, highlighting gaps in biotic stress tolerance. Economic analysis reveals benefit-cost ratios of 3.5-8.3 for adopting varieties one year newer than average age (13 years), indicating strong financial incentives for variety turnover. Our findings suggest that accelerating varietal turnover represents an important but underutilized pathway for agricultural productivity growth and climate adaptation in sub-Saharan Africa. |
| 546 ## - LANGUAGE NOTE |
|---|
| Language note |
Text in English |
| 597 ## - CGIAR Initiative |
|---|
| Donor or Funder |
CGIAR Trust Fund |
| Program & Accelerators |
Breeding for Tomorrow |
| CGSpace handle |
https://hdl.handle.net/10568/180573 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Maize |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
1173 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Seed |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
9893 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Markets |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
3765 |
| 651 #7 - SUBJECT ADDED ENTRY--GEOGRAPHIC NAME |
|---|
| Geographic name |
Africa |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
1316 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Cairns, J.E. |
| Miscellaneous information |
Global Maize Program |
| Field link and sequence number |
INT2948 |
| 9 (RLIN) |
879 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Debello, M.J. |
| Miscellaneous information |
Sustainable Agrifood Systems |
| Field link and sequence number |
INT3210 |
| 9 (RLIN) |
903 |
| 856 4# - ELECTRONIC LOCATION AND ACCESS |
|---|
| Link text |
Open Access through DSpace |
| Uniform Resource Identifier |
https://hdl.handle.net/10883/36812 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Koha item type |
Report |
| Suppress in OPAC |
No |
| Source of classification or shelving scheme |
Dewey Decimal Classification |