Bt cotton remains one of the most widely grown biotech crops among smallholder farmers. Numerous studies, including those previously conducted in Pakistan, attest to its yield and cost advantages.

This paper applies duration analysis to identify the factors that shorten the time until a farmer replaces one modern variety with another, and tests hypotheses concerning two salient themes of the Green Revolution: farm size differences and the r

Zinc is an important nutrient for human health, especially for the growth of children (Caulfield and Black 2004).