问:在玉米田里常常发现叶片的边缘枯焦,是怎么回事?专家:这正是作物缺钾的症状。作物缺钾症状与缺氮症状有明显的差异。例如,玉米生长中期缺氮的表现是老叶沿中脉向两侧褪绿,呈现黄色,而缺钾的症状则通常是从老叶的叶尖和边缘开始褪绿,逐渐变为褐色。随着缺钾程度 Q: What often happens when the edge of the leaves is scorched in the cornfield? Expert: This is exactly the symptom of crop potassium deficiency. Potassium deficiency symptoms and nitrogen deficiency symptoms were significantly different. For example, the lack of nitrogen in the mid-growth stage of corn shows that the old leaves turn green on both sides of the midrib and appear yellow, while the symptoms of potassium deficiency are usually chlorotic and gradually brownish from the leaf tips and edges of the old leaves. With the degree of potassium deficiency