effect on yield increase 增产效应研究
The results show that the technique has significant effect on yield improvement, and the mechanism is the increase of secondary roots and the change of yield component.
试验结果表明，春小麦机械覆膜穴播增产效果达到极显著水平，其增产机理主要为小麦次生根数的增加和产量结构的变化。
The yield and tensile strength of the welded joints of the two kinds of materials increase under dynamic loading and prestrain condition that have little effect on the plasticity of structural steel.
两种材料焊接接头在动载和预应变下的屈服强度和抗拉强度均有所提高，但对其塑性影响均不大。
Cement flying dust decreased the yield of rice and rape at some farmlands, but did not produce harmful effect on its quality. There was an obvious increase in calcium content in polluted soil.
水泥粉尘使一些农田水稻和油菜产量有所下降，但对质量未产生不良影响，水泥粉尘会使土壤中钙的含量明显增加。
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