Hoping to stimulate their competitive juices, Stack had hit on the idea of giving each foreman a copy of the division's
daily productivity figures, broken down by foreman and then compared in total with the other six divisions.
Springtime cold air outbreaks (at least two consecutive days during which the
daily average surface air temperature is below 95 % of the simulated average wintertime surface air temperature) are projected to continue to occur throughout this century.19 As a result, increased
productivity of some crops due to higher temperatures, longer growing seasons, and elevated CO2 concentrations could be offset by increased freeze damage.20 Heat waves during pollination of field crops such as corn and soybean also reduce yields (
Figure 18.3).4 Wetter springs may reduce crop yields and profits, 21 especially if growers are forced to switch to late - planted, shorter - season varieties.