1987年,哈尔演市塑料大棚已发展到2,800亩,其中黄瓜生产2,700亩。今年黄瓜最早在3月29日开始定植,大部分在4月18日～20日进棚。由于4月11日至22日先后出现三次寒流,致使部分黄瓜遭受冻害。据统计,全市受冻黄瓜450亩,152万株,占大棚黄瓜总面积的16.6％。 In 1987, Hall castles plastic shed has grown to 2,800 acres, of which cucumber production 2,700 acres. Cucumber this year as early as March 29 colonization began, most of the April 18 to 20 into the shed. Due to the three cold spells occurring from April 11 to April 22, some cucumbers suffered frost damage. According to statistics, the city’s 450 acres of frozen cucumbers, 1.52 million, accounting for 16.6% of the total area of ​​greenhouse cucumbers.