In nutritional diagnosis techniques, there are three methods that are often applied: morphological diagnosis, chemical diagnosis, and fertilization diagnosis. In the past 20 years, the level of science has developed rapidly both at home and abroad. Nutritional diagnostics have also been applied to fertilizer effect functions, modern testing techniques, and the use of electronic computers. They are closely linked with high-paying technologies such as automated controls to improve the accuracy and scientificity of diagnostics. Open up a broad field.
(I) Morphological diagnosis techniques
Usually the most commonly used technique is morphological diagnosis, which is based on abnormal appearance and typical symptoms of plant malnutrition to determine the abundance of certain nutrients. The morphological diagnosis can only provide preliminary apparent materials for further soil and plant chemical diagnosis.
The advantage of the plant morphology diagnostic method is that it does not require any special equipment. It is simple, rapid, and economical. The disadvantage is that the person who requires diagnosis must have certain practical experience. Otherwise, it is often misdiagnosed. With some potential deficiency factors difficult to diagnose, once symptoms emerge, it is too late to take remedial measures. Therefore, the diagnosis of plant morphology should only be used as a reference.
(b) Chemical Diagnostics Technology
Chemical diagnosis technology is a diagnostic technique that uses chemical methods to determine nutrient abundance in soil and vegetables and guides fertilization. In general, analysis of the nutrient content in the vegetable is the most direct and credible method for judging its nutritional status, but there are still some difficulties in practical application. Since there are many factors affecting the chemical composition in the vegetable body, it is necessary to do a lot of investigation and research work to establish better diagnostic indicators for each vegetable, each growth period and each growth site. Under normal circumstances, simultaneous soil and plant nutrition and chemical diagnosis is a more effective method for scientific fertilization of vegetables.
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