特大葱分321、320两个品种,321植株高大,身干挺直,典型株高160～165厘米,葱白长80厘米,粗5厘米,典型株重1.55公斤,属高白型、中晚熟品种,耐寒、耐旱,但抗病能力较差。320典型株高140厘米,葱白长60厘米,典型株重1.5公斤,高白型粗6厘米左右,耐寒耐旱,抗病能力较321强。两个品种最高亩产均在3000公斤以上,都喜肥怕风。对环境条件的要求:两个特大葱品种的适应性极强,在日平均气温18～24℃时生长最快,对光照条件要求适中,过强会使品质变劣;过弱植株生长细弱,产量不高。虽 321 large and green onions 321,320 two varieties, 321 tall plants, dry and upright, typical height of 160 to 165 cm, onion 80 cm long, 5 cm thick, typical strain 1.55 kg, is a high white, medium and late varieties , Cold, drought, but less resistant to disease. 320 typical height of 140 cm, blue and white length of 60 cm, a typical strain of 1.5 kg, about 6 cm thick white, cold and drought, disease resistance than the 321 strong. The highest yield of the two varieties are more than 3000 kg, are afraid of fear of the wind. The requirements of environmental conditions: two special green onions adaptability is extremely strong, the average daily temperature 18 ~ 24 ℃ when the fastest growing, light conditions require moderate, too strong will make the quality worse; too weak plant growth is weak, Yield is not high. although