摘要
用系统聚类的方法对我国 80年代以来的 5 0个主栽玉米品种进行了划分 ,在此基础上比较研究了不同穗型玉米品种的源库关系 ,并对有关高产潜力的问题进行了探讨。穗型不同 ,产量随密度变化表现出不同的变化趋势 ,在 15 0 0 0～ 10 5 0 0 0株 /hm2 密度范围内 ,大穗型品种呈先升后降的单峰曲线 ,小穗型品种一直呈上升趋势。不同穗型品种获得最高产量的种植密度各不相同 ,此时 ,其产量组成各因素间的关系都协调的较好 ,表现在穗粒数较多、千粒重较高、空秆率较低、经济系数适宜 ,各穗型品种获高产的适宜经济系数均为 0 5左右。密度对不同穗型品种源库关系的调节作用各不相同 ,但各穗型品种发挥最高群体产量时的库源比却达到了高度的统一 ,皆为 1 5 0左右。
When the density of maize was changed,the production of the different maize spike type was prominent otherness.When the planting density was no higher than 105 000 plant/ha,the large spike type of maize showed curve that have single peak,however the small spike type of maize showed a increasing tread.The appropriate planting density was different,but the relations among different yield morphological characters were assorted with each other well which showed more kernel,high kilokernel weight,the low ratio of empty stem and the fitting harvest index.When got high yield,the harvest indexes of the different spike types of maize were all 0 5 or so.The sink-source relation adjustment of different spike types of maize were different,but when got high production,the sink-source ratio were all 1 50 or so.
出处
《华北农学报》
CSCD
北大核心
2002年第z1期193-198,共6页
Acta Agriculturae Boreali-Sinica
基金
国家自然科学基金 (30 170 5 4 6 )
省农业良种产业化资助项目
关键词
玉米
穗型
源-库
密度
Maize
Spike type
Sink-source
Density
