@article{Smale:161901,
      recid = {161901},
      author = {Smale, Melinda and Singh, Joginder and Di Falco, Salvatore  and Zambrano, Patricia},
      title = {Wheat breeding, productivity and slow variety change:  evidence from the Punjab of India after the Green  Revolution},
      journal = {Australian Journal of Agricultural and Resource Economics},
      address = {2008},
      number = {428-2016-27924},
      pages = {14},
      year = {2008},
      abstract = {Variety change and genetic diversity are important means  of combating crop losses
from pests and diseases in modern  agricultural systems. Since the Green Revolution,
genetic  diversity among wheat varieties released in India has  increased but variety
change on farms continues to be slow.  In this article, we define and summarise indices
of variety  change and genetic diversity for the wheat varieties  released and grown in
Indian Punjab during the post-Green  Revolution period. We evaluate the effect of
each index on  technical efficiency with a Cobb-Douglas yield model after  testing for
exogeneity. Findings support the hypothesis  that slow variety change has offset the
positive  productivity effects of diversifying the genetic base in  wheat breeding during
the post-Green Revolution period.  Policies that speed the rate of variety change  and
contribute to a more equitable spatial distribution of  modern varieties could support
wheat productivity in the  Punjab of India, reinforcing plant breeding successes.},
      url = {http://ageconsearch.umn.edu/record/161901},
      doi = {https://doi.org/10.22004/ag.econ.161901},
}