玉米杂交种对肥力反应的基因型差异

在两个肥力水平下，研究杂交种的敏感度，采用相关分析和通径分析方法研究库源性状与单株粒重关系，并对杂交种耐肥性进行了评价，结果表明：不同玉米杂交种的产量存在显著差异．铁单12、吉单180、农大108等在高、低肥条件下均有较高产量，敏感度较低，适用高肥投入地区，也适用于贫瘠土壤的地区．在高肥条件下，选育杂交种应选育茎秆粗状、植株较高、穗粒数多、百粒重大的品种，并适当限制其穗位高，限制其秃尖率．低肥条件下，注意选育穗较长、穗粒数多、茎秆粗壮、干重较大、叶面积较大的品种．

Genotypic Difference in Fertilizer Effects on Maize Hybrids

The study ,made through correlation analysis and path analysis in different fertilizer levels in TongLiao ,Inner Mongolia ,was concerned with sensibility of gene maize hybrids, kernel weight per plant ,the results were:There was great difference in yield between maize hybrids Tiedan12,Jidan180 and Nongda108,having lower fertilizer sensibility, had high yields under any fertilizer levels. They were suited to either regions of higher fertilizer level or regions of scant fertilizer. Under high fertilizer levels, the suitable targets were those that had great stem diameter, high stem, much more kernel number of ear, great 100 kernel weight, large raw number of ear, great net weight and large leaf area. Under lower fertilizer levels, however, the suitable targets were those that had great ear length, large kernel number of ear, great 100 kernel weight, great net weight and large leaf area.