摘要
以洛薯8号为材料,采取随机区组设计,进行相同施肥管理水平下的密度试验,探索洛薯8号获得最好经济效益的栽培密度。结果表明：群体随密度增加而增大,但个体转弱,导致营养生长与生殖生长不协调,植株的抗病性、抗逆性变差;随着密度加大（45 000～90 000株/hm^2）,单株结薯个数由4.8个减少到3.6个,单株结薯质量由684.71g减小到410.41g,平均薯块质量由142.64g减小到114.00g,大薯率由75.26%减小到38.92%,商品率逐渐变差,由90.64%下降到63.54%;产量随着栽培密度的增加呈现先增加后减少趋势,栽植密度为45 000株/hm^2时产量最低,为30 811.80kg/hm^2,密度为67 500株/hm^2时产量达到峰值,为38 426.10kg/hm^2,随后产量逐渐降低。密度67 500株/hm^2与密度为60 000、75 000、82 500株/hm^2之间产量差异不显著,而与其他密度（45 000、52 500、90 000株/hm^2）处理间存在显著差异。从而得出洛薯8号在河南两季作区的适宜栽植密度为60 000～82 500株/hm^2,最适宜密度为67 500株/hm^2。
The density experiment of Luoshu 8 was carried out by the randomized block design under the same fertilization level in order to determine the optimum density of Luoshu 8.The result showed that,with the increase of density,the population increased,but the individuals became weak,leading to the incoordination between vegetative growth and reproductive growth and the poor resistance to diseases and adverse conditions.Along with the increase of density,the number of tubers per plant decreased from 4.8 to 3.6,the quality of tubers per plant decreased from 684.71 g to 410.41 g,the average tuber quality decreased from 142.64 g to 114.00 g,the rate of big tubers decreased from 75.26% to 38.92%,and the commodity rate of tubers decreased from 90.64% to 63.54%,whereas the total yield increased first and then decreased.The lowest yield（30 811.80kg/ha）came from the density of 45 000plants/ha,and the highest（38 426.10kg/ha）from the density of 67 500plants/ha,the yield of which had no significant difference with those of 60 000-82 500plants/ha.This suggested that the proper density of Luoshu 8 was 60 000-82 500plants/ha,and the optimum density was 67 500plants/ha.
出处
《河南农业科学》
CSCD
北大核心
2014年第7期48-51,共4页
Journal of Henan Agricultural Sciences
基金
现代农业产业技术体系专项资金项目(CARS-10)
作者简介
皇甫庭（1966-），男，河南商丘人，本科，主要从事马铃薯栽培技术研究与推广工作。E—mail：969345336@qq．com
