Abstract:
In this study, the factors creating systematic risk
for dry farming wheat crop in Iran
were investigated. Using production functions as we
ll as spatial econometric approach,
the effects of changes in climatic parameters such
as temperature and precipitation, and
also input levels of seed, urea, and phosphate fert
ilizers in warm, moderate, and cold
climates were examined. The results showed that the
fluctuations of climatic parameters
in the three climates were severe enough to be iden
tified as systematic risk factors. The
findings also indicated that, in a warm climate, la
ck of sufficient heat during cultivation
time (October), overheating during initial growth m
onths (December and January), lack
of sufficient precipitation during initial growth m
onths (November and December) and
inadequate seed and urea fertilizer and overusing p
hosphate fertilizer were the systematic
risk factors. In moderate climate, these factors in
cluded lack of sufficient heat in
cultivation time (October) and in late harvest time
(July), lack of sufficient precipitation
in the cultivation time (October)
and lack of urea fertilizer and seed phosphate over
use.
Finally, in the cold climate, insufficient heat in
vegetative growth time (March),
inadequate precipitation in the cultivation and ini
tial growth time (October and
December), and also lack of phosphate fertilizer an
d seed overuse were identified as the
systematic risk factors.
Keywords:
Climate change, Insurance
precipitation, Temperature, Iran.
