the distribution proportion of wheat roots in trench planting is bigger in lower level soil than in the surface layer soil, which contributes to the increase of ear numbers and grain weight.
沟播小麦的根系下层分布比例较大,单位重量的根不仅能支撑较重的地上部,也能承担较多穗数和粒重;
the mechanization mulch film ridge covering and trench planting technology is one of the four saving engineering's provided by agriculture ministry.