2种植物生长调节剂对马铃薯生长的影响

为了探讨马铃薯喷施生长调节剂的作用与使用方法，以马铃薯品种‘冀张薯8号’为材料，选用生长调节剂多效唑和矮壮素，在马铃薯现蕾期、开花期、淀粉积累期喷施，对叶绿素含量、株高、产量及大小薯等指标进行分析。结果表明，在马铃薯植株生长期内喷施多效唑和矮壮素都可有效降低株高、提高叶绿素含量和产量，开花期喷施株型合理，鲜薯总产量和大薯产量最高。所有处理和对照相比株高降幅在16.1%~43.4%之间，叶绿素含量SPAD值提高1.8%~36.5%，产量提高1.7%~35.57%。以50%矮壮素400倍液，多效唑675 g/hm2，在马铃薯开花期喷施，较不喷施的处理分别增产28.0%和35.57%。

Effects of Paclobutrazol and Chlormequat Chloride on Potato Growth and Yield Index

Under condition of field cultivation,potato‘Jizhang No.8’were sprayed with paclobutrazol(PP333) and chlormequat chloride(CCC) in squaring period,flowering period and starch accumulation period to study their effect on yield constituents.The results suggested that: spraying PP333 and CCC could increase the yield and chlorophyll content,and decrease the average strain height of potato in all stages.The strain height was the lowest in squaring period.The production and chlorophyll content of potato increased most in the flowering period and lest in starch accumulation period.The strain height decreased range was 16.1%-43.4%,the SPAD value increased range was 1.8%-36.5%,the yield increased to 1.7%-35.57%.So flowering stage was the best growth period of potato to spray PP333 of 675 g/hm2 and CCC of 400 × dilution rate,the yield increased to 35.57% and 28.0% respectively.