75
fertilizer which produce less rice than areas uniformally fertilized. The dummy variable for fertilizer application substantiates this conclusion. The regression equation indicates that the yield associated with mechanical fertilizer application was 800 kilograms higher than when hand application was used (800 is 18 percent of the mean yield on farms in the sample). The mean levels of inputs were relatively close to the optimal levels as calculated from the regression coefficients. The rather long experience of rice growers in the region, and in similar areas in the country, undoubtedly contributed to this condition.
Sesame
The production function calculated for sesame is:
Y = -40805.0 259.IT + 11711.7M 1491.4M2 + 58.6M3 + 215.IL
-1.43L2 + .0029L3 29.645S- .575S2 + 2.52(M)(L) + 9.4(M)(S)
-202.7DI + 299.6D2
whe re:
Y = yield in kilograms per hectare T = tenure (0 = owner, 1 = tenant)
M = hours of tractor use per hectare
L = hours of labor per hectare
S = expenditures on seed per hectare
D = dummy variable for municipio (town) of San Juan (I if farm
in San Juan; 0 otherwise)4
D2 = dummy variable for municipio of Becerril (I if farm in
Bercerril; 0 otherwise).
4The third municipio is Codazzi.