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霜是一种自然现象,空气中的水蒸气温度降到冰点以下即凝成固体的霜。近地面温度骤降至0℃以下,低于小麦当时发育阶段所能忍受的最低温度,即致小麦受霜冻。 1986年3月上旬在我省川中、川西北的大部分地区出现了多年难遇的晚霜,使部分发育快的小麦遭受冻害。受冻后的小麦产量视受害轻重有不同程度的减产。作者仅将过去对小麦冻害研究积累的管见,整理于后,供参考。一、我省小麦受冻害的主要原因
Cream is a natural phenomenon, the water vapor temperature in the air drops below the freezing point that is solidified cream. The temperature near the ground plunges below 0 ° C, which is below the minimum temperature that wheat can tolerate during its developmental stages, causing the wheat to be frosted. Early in March 1986 in Sichuan Province in our province, most of the area in northwestern Sichuan appeared many years of late frost, so that part of the rapid development of wheat suffered frost damage. Frozen wheat yield depending on the severity of the victims have different levels of yield reduction. Only the author of the past, the accumulation of wheat frost research and management, finishing, for reference. First, the main cause of wheat frost damage in our province