MARC details
| 000 -LEADER |
|---|
| fixed length control field |
03447nab|a22004097a|4500 |
| 001 - CONTROL NUMBER |
|---|
| control field |
69514 |
| 003 - CONTROL NUMBER IDENTIFIER |
|---|
| control field |
MX-TxCIM |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
|---|
| control field |
20251215135521.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
|---|
| fixed length control field |
2511112025|||||ne ||p|op||||00||0|eng|dd |
| 024 8# - OTHER STANDARD IDENTIFIER |
|---|
| Standard number or code |
http://dx.doi.org/10.2139/ssrn.5345569 |
| 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 |
Ndegwa, M.K. |
| Field link and sequence number |
001713077 |
| Miscellaneous information |
Sustainable Agrifood Systems |
| 9 (RLIN) |
1681 |
| 245 10 - TITLE STATEMENT |
|---|
| Title |
Is newer better? The effect of varietal age on real-world maize yield in Kenya |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
|---|
| Place of publication, distribution, etc. |
Netherlands : |
| Name of publisher, distributor, etc. |
Elsevier, |
| Date of publication, distribution, etc. |
2025. |
| 500 ## - GENERAL NOTE |
|---|
| General note |
Preprint |
| 500 ## - GENERAL NOTE |
|---|
| General note |
Open Access |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc. |
Maize varietal turnover is widely promoted across Sub-Saharan Africa to improve crop productivity and increase food security, yet its impact on yields remains poorly understood amid heterogeneous agroecological and socioeconomic conditions. This study quantifies the yield effects of varietal age in Kenya using a three-wave panel survey (2023-2024) of 4,160 smallholder households across Kenya. Using entropy balancing and weighted regression models to isolate the effect of varietal age on maize yield, we find a strong and consistent relationship between varietal age and yield. New varieties yield 147 kg/ha more than old ones in the long rains and 91 kg/ha more in the short rains. Finer age categorization reveals that switching to ultra-new varieties (0-5 years) delivers the highest gains-360 kg/ha over ultra-old varieties (21+ years) in the long rains and 269 kg/ha in the short rains. These findings suggest that slow varietal turnover carries significant opportunity costs in the form of forgone yield gains. While farmers generally perceive new varieties favorably-particularly for yield potential, early maturity and grain quality-concerns around labor intensity and resilience remain, potentially dampening adoption. Providing farmers with clear, locally relevant performance data and opportunities for on-farm experimentation can help shift perceptions and support wider uptake. Policies and programs that expand access to newer, better-performing varieties and strengthen seed quality assurance are essential for translating genetic gains into productivity improvements across Kenya's bimodal maize |
| 546 ## - LANGUAGE NOTE |
|---|
| Language note |
Text in English |
| 591 ## - CATALOGING NOTES |
|---|
| Affiliation |
Nyangau, P.N. : No CIMMYT Affiliation |
| 597 ## - CGIAR Initiative |
|---|
| CGIAR Impact area |
Climate adaptation & mitigation |
| -- |
Nutrition, health & food security |
| -- |
Poverty reduction, livelihoods & jobs |
| CGIAR Initiative |
Market Intelligence |
| -- |
Seed Equal |
| CGIAR Action areas |
Resilient Agrifood Systems |
| -- |
Genetic Innovation |
| Donor or Funder |
Bill & Melinda Gates Foundation (BMGF) |
| CGSpace handle |
https://hdl.handle.net/10568/178118 |
| Program & Accelerators |
Breeding for Tomorrow |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Entropy |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
40511 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Smallholders |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
1763 |
| 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 |
Yield gap |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
1356 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Senses |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
38065 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Fertilizers |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
1111 |
| 651 #7 - SUBJECT ADDED ENTRY--GEOGRAPHIC NAME |
|---|
| Geographic name |
Kenya |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
3783 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Field link and sequence number |
001715648 |
| Personal name |
Nyangau, P.N. |
| Miscellaneous information |
Sustainable Agrifood Systems |
| 9 (RLIN) |
38256 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Kariuki, S.W. |
| Field link and sequence number |
N1706368 |
| Miscellaneous information |
Integrated Development Program |
| -- |
Sustainable Agrifood Systems |
| 9 (RLIN) |
6403 |
| 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 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Michelson, H.C. |
| 9 (RLIN) |
31389 |
| 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 |
| 773 0# - HOST ITEM ENTRY |
|---|
| Title |
Social Science Research Network (SSRN) |
| Related parts |
In press |
| Place, publisher, and date of publication |
Netherlands : Elsevier, 2025 |
| 856 4# - ELECTRONIC LOCATION AND ACCESS |
|---|
| Link text |
Open Access through DSpace |
| Uniform Resource Identifier |
https://hdl.handle.net/10883/36067 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Koha item type |
Article |
| Suppress in OPAC |
No |
| Source of classification or shelving scheme |
Dewey Decimal Classification |