The commonly used herbicide atrazine kills weeds in corn and sorghum fields without harming the crops.
Indiana Department of Agriculture officials say the so-called "green manure" helps soil recover faster if there is little rain.
Pumpkins have deep roots, so they were able to withstand the state's summer drought.
Drought conditions this summer have driven up the price of grain, which is a main food source for hogs.
As farmers begin to harvest crops that have been devastated by the drought, many are looking for ways to avoid similar difficulties next year.
Farmland prices have risen between 14 percent and 18 percent this year and will likely continue to increase.
State officials are urging farmers to use precaution as the drought has increased risks for fire, harmful dust and mold due to decomposition.
The quality of the popcorn may not be as high as consumers have come to expect.
Rain storms that have moved throughout much of the state in recent weeks have helped alleviate drought.
Western Indiana gets soaked, but the whole state remains below-average in rainfall.