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一切生物的外表形态都是内在特性与外界环境条件的综合反应。棉株茎叶等的输导组织内,含有的无机营养分;一方面标志着植株从根系层内吸收的游离态营养物质数量。反映当时土壤可给的肥力状态;另一方面也标志着可供植株利用的营养分水平。测定不同生育期的这种营养分含量,可以直接标志着植株当时对营养分的需要是否得到满足,为合理施肥提供一定的依据。为此,我们把几年来在这一方面的研究资料整理如下,供参考。
The appearance of all creatures is a combination of internal characteristics and environmental conditions. Cotton plant stems and leaves and other conductive tissue, containing inorganic nutrients; on the one hand, marks the plant from the root layer of the amount of free nutrients absorbed. Reflect the state of fertility available to the soil at that time; on the other hand, it also marks the level of nutrients available to plants. Determination of the different growth stages of this nutrient content, can directly indicate the plant nutrient needs were met, to provide a reasonable basis for fertilization. For this reason, we put the research data in this area over the years as follows for reference.