零度以上的低温对高粱生长发育产生的冷害已引起国内外学者的普遍重视。我国北方冷害是导致高粱产量不稳定的重要原因之一。近年来,科技工作者积极探索抗低温的各种措施,如:改进栽培、地膜覆盖、理化处理、改善营养条件等,并取得了重要成果。然而,具有潜势的高粱抗低温育种工作仅刚刚起步。Bacon 等(1986)用轮回选择法已选出幼苗期抗低温的高粱群体,该群体经过4轮的选择后,其籽粒产量比原来增加了60公斤/亩。以往的研究表明,高粱苗期(发芽、出土、幼苗期)和灌浆期对低温最为敏感(中国高粱栽培学,1988)。因此,鉴定高粱这两个生育时期的抗冷性,筛选抗源具有重要意义。本研究旨在采用准确的田间鉴定指标,对高粱 Cold damage caused by the growth of sorghum at temperatures above zero has drawn widespread attention from domestic and foreign scholars. Cold damage in northern China is one of the important causes of instability in sorghum production. In recent years, scientists and technicians have actively explored anti-hypothermia measures such as improving cultivation, plastic film mulching, physical and chemical treatments, improving nutrient conditions, and achieved important results. However, the potential of sorghum breeding has only just started. Bacon et al. (1986) selected the sorghum population with low temperature resistance in seedling stage by recurrent selection. After 4 rounds of selection, the population of the sorghum increased by 60 kg / mu compared with the original one. Previous studies have shown that sorghum is most sensitive to low temperatures at the seedling stage (germination, unearthed, seedling stage) and filling stage (China Sorghum Cultivation, 1988). Therefore, identification of sorghum during both growth period of cold resistance, screening of anti-source is of great significance. The purpose of this study is to use accurate field identification of sorghum