$6.$ True or False: Incorporating cover crops into a farming system can significantly reduce nitrogen leaching from synthetic fertilizers.

$7.$ True or False: Potassium chloride $($KCl$)$ is recommended over potassium sulfate $($K$$SO$)$ for chloride$-$sensitive crops due to its lower chloride content.

$8.$ True or False: The Ostwald process for producing nitric acid is a carbon$-$neutral process that does not contribute to carbon dioxide emissions.

$9.$ True or False: Ammonium sulfate fertilizer is preferred in alkaline soils to help lower the pH and provide essential sulfur and nitrogen to crops.