Root length density varied with fertigation frequencies, and the ratio of root length for different soil layers to the total root length in the profile varied with fertigation strategies.

施肥频率对根密度的影响主要是引起各土层根密度大小的变化，运行方式则对各土层根长占整个剖面根长总和的比例产生影响。

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The experimental results show that the higher the static temperature and the density ratio between two supersonic flow, the more the total pressure losses of flow during mixing.

实验结果表明：混合过程的总压损失随两种超声速流的密度比、静温比增大而增加。

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But total pressure loss increases with the increasing of the velocity difference accompanied with the increase of the density and the static temperature ratio.

但速度差随密度比、静温比增大而增大时总压损失亦随之增大。

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