因受厄尔尼诺和拉尼娜现象的影响，自然灾害频发，对农业生产影响大。１９９８年３月２０～２１日，我场再次遭受强寒流袭击，普降大雨、雪、雹，雨雪量达１５～２５ｍｍ，短时最低气温降至－１℃。由于此时麦子生育进程较常年早１０天左右，已进入剑叶抽出期，部分大麦品种已 Due to the impact of El Niño and La Niña, frequent natural disasters have a great impact on agricultural production. From March 20 to 21, 1998, my field was once again hit by a strong cold current, with heavy rain, snow, hail and rain and snow reaching 15-25 mm. The short-term minimum temperature dropped to -1 ° C. As the process of wheat growth at this time about 10 days earlier than usual, has entered the flag leaf extraction period, part of the barley varieties have been