旱作玉米覆膜种植区，因没有灌溉条件，因此追肥很困难，追肥时往往把化肥施入干土层内，使化肥利用率降低，如结合降雨追肥，也难以做到和作物需肥时期相一致。另外，氮肥分期追施费工、费时、操作不便，影响覆膜后的增温、保墒效果。由于地膜覆盖后具有保肥作用，所以旱作玉 Dry cultivation of corn covered areas, because there is no irrigation conditions, it is very difficult to top-dressing, top dressing fertilizer often applied to the dry soil layer, so that lower fertilizer utilization, such as combined with rainfall dressing, it is difficult to achieve and crop fertilizer period Consistent. In addition, nitrogen fertilizer staging costs workers, time-consuming, inconvenient to operate, affecting the film after warming, soil moisture effect. As the film after covering with fattening effect, so dry as jade