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作物缺乏某种营养元素，在形态上表现出特有的症状。由于不同营养元素的生理功能不同，症状出现的部位和形态常有其特点和规律。通过肉眼观察作物形态的变化，判断某种营养元素的丰缺状况，称为形态诊断。下面介绍小麦的缺素营养形态诊断要点：１．缺氮 叶片短、窄，茎部叶片
Crops lack a nutrient element that exhibits unique symptoms in morphology. Due to the different physiological functions of different nutrients, the symptoms of the site and form often have their own characteristics and laws. Through the macroscopic observation of crop morphological changes to determine the abundance of a nutritional element status, known as morphological diagnosis. The following describes the nutritional deficiencies of wheat diagnosis points: 1. Nitrogen-deficient leaves short, narrow, stem leaves