银北灌区发展青饲玉米的气候适宜性分析

分析了银北地区历年6～9月光、温、水条件，通过田间试验复种青饲玉米，确定合适的播期，为银北灌区发展畜牧业提供青饲种植的技术依据，并提出了在该区发展青饲青贮玉米推广种植的策略方针。结果表明，成熟度5成以上所需积温≥2260．0℃·d，气候保证率在80％，延长灌浆期5d会使熟度提高1～2成。随着播期的推迟，其温度、降水的保证率明显下降。复种青饲玉米最适播期在7月10日前，适宜在6月下旬收获的蔬菜、粗杂粮田块复种，在水肥保证条件下成熟度可达4成以上，产草量和青贮营养能同时提高。早熟马铃薯、单种小麦在7月上旬之前收获后复种，成熟度难以保证，但产草量仍较高。麦套玉米不适宜复种麦带青饲玉米，热量明显不足，产草量、养分显著下降。

Climatic Adaptability Analysis of Silage Corn in Northern Ningxia

By analyzing the characters of sun duration,temperature and precipitation from June to September over past years in northern region of Ningxia,the suitable seeding date was determined based on the date of seed by a lot of experimentations of planting wheat and replanting silage corn,copes with the adjustment of agricultural industrialization.And a extend strategy of crop silage corn and the gist of developing stock raising technology were put forward for obtaining more economical effect in developing silage...