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无论是单一稀土还是混合稀土对小麦、棉花生物产量都有不同程度的促进作用,La、Pr、MR表现较为突出,Ce表现较差,MR去Ce后对生物产量有明显的改善作用。La、Ce对小麦根的干重有一定抑制作用,但La显著促进根毛的生长,致使吸收能力反而加强。La、Pr对植物叶绿素形成有较好的作用,Ce,Nd,MR表现较差。单一稀土和混合稀土对生物N、P、K含量的影响有着明显的差异,且不同作物所产生的效应也不相同。单一稀土之间对生物产量和N、P、K吸收量均无明显的相互作用(除La、Ce相互作用对棉花吸收K有较明显协助作用以外)。相关分析表明,在N、P、K中只有N含量与生物产量有较好的正相关,稀土通常能提高生物含N量,所以都有不同程度提高生物产量的作用。
Both the single rare earth and the mixed rare earth promoted the biomass production of wheat and cotton in varying degrees. The results of La, Pr and MR showed outstanding performance and Ce showed poorer performance. La and Ce had some inhibitory effects on the dry weight of wheat roots, but La significantly enhanced the growth of root hairs, resulting in an increase in absorption capacity. La and Pr have good effect on plant chlorophyll formation, while Ce, Nd and MR show poorer performance. The effect of single rare earth and mixed rare earth on the contents of N, P and K in organisms is obviously different, and the effects of different crops are also different. There was no obvious interaction between biomass and N, P, K uptake of a single rare earth (except for the obvious interaction between La and Ce on cotton absorption K). Correlation analysis showed that there was only a good positive correlation between N content and biomass in N, P and K. Rare earth could usually increase the content of N in biomass, so all of them had the effect of increasing biomass.