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在营养膜培养的早期,将许多植物生长不良和根部死亡的问题都归因于营养的不足或过度。现在认识到该观点是过于简单了,通气和根部病害都应考虑为营养问题。由于各种原因,植物的营养问题是经常存在的。在某些情况下,营养不足由于对所有的必需元素应维持在一个适当的水平缺乏认识而引起的。假若对两个营养体系进行比较,一个在温室土或泥炭土中供以仅含有氮素和钾素的营养液,另一个是用十二种营养元素组成的水培液,但要求对这
In the early stages of nutrient film culture, the problem of many plant malnutrition and root dying is attributed to undernutrition or overnutrition. It is now too simplistic to recognize that ventilation and root disease should all be considered as nutritional issues. Due to various reasons, plant nutrition problems often exist. In some cases, undernutrition is caused by a lack of awareness of the need to maintain an adequate level of all necessary elements. If we compare two nutrition systems, one is a nutrient solution containing only nitrogen and potassium in greenhouse soil or peat soil and the other is a hydroponic solution consisting of twelve nutrient elements,