 As such, corn hybrids which are tolerant to drought , and heat would produce more consistent yields compared to the hybrids which are not tolerant to these stresses.
<clarity>  As such, corn hybrids which are tolerant to drought , and heat would produce more consistent yields compared to the hybrids which are not tolerant to these stresses.
 As such, hybrid crops which are tolerant to drought , and heat would produce more consistent yields compared to the hybrids which are not tolerant to these stresses.