A FOT index is an index that is similar to a B-Tree index, but an FOT index has multiple root nodes and fewer levels. (B-Tree indexes have only one root node and more levels.)
According to the demand of different property indexes, the para-meters of the root locus method compensator are calculated with different formulae respectively in this paper.
本文根据不同性能指标要求，分别采用不同的公式计算根轨迹法校正装置的参数。
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When the biochar added more than 10.0%, all the indexes of anatomical structure of root had a descending trend.