干热风,又叫火风、热风、干旱风,是指高温、低湿并伴随一定风力的大气干旱现象。其气象要素主要表现为少雨干燥、气温偏高多风。干热风的一般指标是:14时前后空气相对湿度≤30%,日最高气温≥30℃,风力≥3米/秒,俗称“三三制”。气象要素越大于此基本指标,其危害越重。由于干热风主要发生在油菜角果发育成熟后期,对油菜的危害很大。可导致角果不能正常脱水、成熟,使得油菜植株 Dry hot wind, also known as hot wind, hot wind, dry wind, refers to the high temperature, low humidity and accompanied by certain winds of atmospheric drought phenomenon. The main meteorological elements of dry and less rain, the wind is high and windy. Dry hot air of the general indicators are: before and after 14 o’clock air relative humidity ≤ 30%, the highest temperature ≥ 30 ℃, the wind ≥ 3 m / s, commonly known as “33 system.” The larger the meteorological elements are, the more serious the damage is. Dry and hot wind occurs mainly in the rape pod development and maturity, a great harm to the rapeseed. Can lead to the normal fruit dehydration, ripe, making rape plants