棉花的营养诊断是制定棉田水肥管理措施的重要依据之一。多年来的生产实践,人们摸索总结出了“观叶相”,“红绿比”、“柄节比”等方法。我们进行了多年的观察研究,试验并验正总结出了“百分之四诊断法”,仅供参考。 Nutritional diagnosis of cotton is one of the important bases for formulating water and fertilizer management measures in cotton field. Over the years of production practice, people worked out summed up the “concept of leaf phase”, “red ratio”, “handle ratio” and other methods. We conducted many years of observational studies, tests and tests to sum up the “four percent diagnostic method” for reference purposes only.