The percentage of root biomass allocated to cluster roots increased in the soil layer supplemented with P in a split-root system.

在分根系统中，白羽扇豆的排根占根系干重的比例在局部供磷（羟基磷灰石）的土层中大量增加。

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A split -plot experimental design was used with differing soil types in the main plots and differing rod shapes, travel speeds, rod speeds and tillage depths in the sub -plot.

本试验采用了裂区实验设计；土壤类型为主区，除草器的形状，转速、前进速度及耕深在小区内。

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Africans are often split on the merits of French interventions on their soil.

WSJ: Mali Advance Shows Paris's Africa Dilemma