“甘棉4号”是甘肃省农业科学院经济作物研究所棉花组在敦煌县白马塔一队(原红星塔一队)选育出的高衣分品种。经甘肃省农作物品种审定委员会1982年12月会议评审定名为“甘棉4号”,并列为我省敦煌棉区的推广种。敦煌位于河西走廊西端,属内陆特早熟棉区。当地无霜期短,日照充足,降水少,蒸发大,极端干旱。棉花生长特点:植株矮小,单株成铃少。栽培上主要实行高密度靠群体抓总铃数。对品种要求:株型紧凑,适于群体发展;早熟,前期结铃多;铃大、衣分高。为此,育种目标应以早熟为前提,突出衣分,兼攻铃重,保单株基本铃数;形态特征适于高密度栽 “Ganmian No.4” is a high-racial sub-variety bred by Cottonseed Group, Institute of Economic Crops, Gansu Academy of Agricultural Sciences in the First Team of Baima Tower, Dunhuang County (formerly Red Star Tower Team). After Gansu Province Crop Variety Approval Committee December 1982 meeting review named “Gan cotton 4”, tied for the promotion of cotton province in our province Dunhuang. Dunhuang is located at the western end of the Hexi Corridor, a particularly inland cotton precinct. The local frost-free period is short, adequate sunshine, less precipitation, evaporation, extreme drought. Cotton growth characteristics: plant dwarf, bolls per plant less. Cultivation of the main implementation of high-density rely on the total catch ring number. Variety requirements: compact plant type, suitable for population development; early maturity, pre-bell more; bell large, high clothing points. To this end, breeding objectives should be premature, prominence of clothing points, and the role of boll weight, the basic boll number; morphological characteristics suitable for high density planted