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水培过程中营养液中的ＮＨ＿４－Ｎ浓度下降伴随ＮＯ＿３－Ｎ浓度提高，培养过程中溶液活性Ａｌ含量下降，ｐＨ值降低并非活性Ａｌ浓度提高所致，培养液加Ａｌ对ｐＨ下降有缓冲作用。茶树根系分泌物中有咖啡因和儿茶素类物质，利用培养过茶树的营养液再次培养茶苗，即使通过添加速效Ｎ、Ｐ、Ｋ保持其营养水平，茶树生长仍然受到抑制。据此推断，茶树根系分泌物中的咖啡因和儿茶素类物质具有异株克生作用。
During hydroponics, the decrease of NH_4-N concentration in nutrient solution was accompanied by the increase of NO_3-N concentration, the decrease of Al content in solution during incubation, and the decrease of pH value was not caused by the increase of active Al concentration. . Tea tree root exudates with caffeine and catechins material, the use of tea culture has been cultivated tea seedlings again training, even by adding available N, P, K to maintain their nutritional levels, tea tree growth is still suppressed. It is inferred that caffeine and catechins in tea root exudates have the effect of isogenic.