辽宁省复种青贮玉米潜力分析与技术探讨

分析了复种青贮玉米Zea mays对气候资源的利用特点、产量和品质优势以及市场需求，并根据田间试验结果提出了辽宁地区复种青贮玉米生产的4项关键技术，即：辽宁地区复种青贮玉米适宜的品种为郑单958和高油青贮4515；为保证产量和品质，选用郑单958和高油4515品种，播期最好不要超过7月19日；在有机质中等偏上、氮含量中等、磷和钾缺乏的土壤条件下，经济合理的施氮量为250 kg/hm2，施磷量(P2O5)为100 kg/hm2；采用穴播技术（一穴双株）可有效地提高产量，适宜的穴播密度为10万株/hm2。

Potential analysis and technical discussion on multiple cropping silage corn in Liaoning

The climatic resources utilization characteristic, yield and quality advantage as well as market demand of multiple cropping silage corn were analyzed. Four key planting techniques were presented. The results of field experiment showed that Zhengdan958 and Gaoyou4515 fit for multiple cropping in Liaoning, their sowing date should not be later than July 19. Under the soil condition with more than middle level organic matter, middle nitrogen content, and lack phosphorus and potassium, appropriate fertilization amount of nitrogen (N) was 250 kg/hm2, phosphorous(P2O5) was 100 kg/hm2. Bunch planting technique (two plants per hole) could improve yield effectively, and the most appropriate density was 100 000 plants per hectare.