Most countries in the world depend primarily on rainfed agriculture for
their grain food and there are strong reasons to believe that investments in lowyielding
rainfed agriculture could have large impacts on poverty reduction. Most
works in crop physiology related to breeding does focus on either yield potential
or yield under stressful conditions which may reverse performance in other
environments. These finding may explain why past breeding programs have
largely not as expected to produce an impact on subsistence agriculture in
developing countries. Correlation between the same traits in two environments
may be negative or positive, depending on the environment where the experiment
was grown. Crop selection in natural rainfall conditions vary in different years
with additional stress-managed experiments, particularly when error variance is
high and heritability estimate is low, resulted in optimum cultivar selection.
These cultivar, yield better than any other available cultivar in high to low
rainfall conditions, moreover an economic production under severe drought stress
and therefore, increased productivity in a wide range of unpredictable rainfed
environments. A researcher can use improved statistical design and analysis
techniques, in multienvironments information, and consider secondary traits for
making selection decisions. These alternative traits should still be much simpler
than the complex genes controlling ultimately yield itself under a wide range of
conditions. Earliness, canopy temperature, maintaining high kernel weight and
leaf senescence are considered inherent heat and drought tolerance in wheat