nitrogen What nutrient is present in the atmosphere as a gas, and is responsible for the vegetative growth and dark green color of the plant? The blade of the leaf is broken down into what three parts? tip, margin, and base phosphorus If a fertilizer ratio is 5-10-15, what element does the number 10 represent? pollination What is the union of the pollen and the stigma known as? cereal Wheat, barley, oats, and rice are examples of what type of crop? placement A student whose Supervise...