Using data from an extensive four-year study, Udry et al. (1995) use a regression analysis to explore the variation in yields between men's plots and women's plots. Udry finds that women farmers are as efficient as men; however, women lack equal access to inputs and labor. This is particularly true of manure, which is exclusively allocated to men's plots. Subsequently, yields from women's plots are consistently lower than those from men's plots. Udry et al. determine that output could increase from between 10 and 20 percent if factors of production were reallocated between men and women's plots.
Gender Differentials in Farm Productivity: Implications for Household Efficiency and Agricultural Policy
Udry, C., J. Hoddinot, H. Alderman, and L. Haddad. 1995. Gender Differentials in Farm Productivity: Implications for Household Efficiency and Agricultural Policy. Food Policy, Vol. 20, No. 5.