Taking the main open for outside vegetable varieties choy sum of Yongning County in Ningxia as main research object,the research mainly focused on the impact of the frost weather in early April on outdoor vegetable.In the first year,through the indoor artificial frost box simulation test the initial indicators were obtained,the next year outdoor field frost environment test research was carried out,combined with the observational data of portable automatic weather station and the statistical symptoms of choy sum after freezing,the frost index of choy sum and the suitable frost-defensive technology were obtained.The results showed that the index of mild frost damage of choy sum seedling was about-2.2 ℃;the index of moderate to severe frost damage was about-3.3 ℃;the index of severe to lethal was about-4.2 ℃.The most effective frost defensive measure was to spray plants.%以宁夏永宁县主打的露地供外蔬菜品种菜心为研究对象,主要针对4月初的霜冻天气对露地蔬菜的影响开展综合试验研究,第一年通过室内人工霜箱模拟试验得到初步指标,次年开展室外大田霜冻环境试验研究,结合便携式自动气象站观测数据和菜心受冻后的统计症状,得出菜心的霜冻指标及适宜霜冻防御技术.结果表明,菜心幼苗轻度冻害的指标为-2.2℃左右,中度到重度冻害的指标在-3.3℃左右,重度到致死的指标在-4.2℃左右;最有效的霜冻防御措施为给植株喷水.
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