June is the harvest season for winter wheat. In May, wheat begins to fill with grain. At this time, attention should be paid to applying nitrogen fertilizer, watering the grain, and preventing and controlling diseases and insect pests. With last year's experience, the serfs knew how to apply fertilizer and water, but they were not sure about the specific amount and method of using fertilizer and water. They could only wait for Maria to see the wheat fields before making a decision. The growth rate of wheat in different fields was also different, which forced Maria to spend all her time in those fields. She left early and returned late...