BEC (boron efficiency coefficients) of NW20 and NW933 were respectively 0.51 and 0.10 at seedling stage and 0.38 and 0 at seeding stage.

• 以同一生态型苗期地上部生物量或结实期种子产量缺硼处理与施硼处理之比为硼效率系数。 苗期NW20和NW933硼效率系数分别为0 51和0 10;