Effects of N Fertilizer Promoting and Paclobutrazol Controlling Combination on Physiological Characteristics and Yield of Potato
Dong Daofeng
Chen Guangxia
Ma Lei
Liu Fang
Yang Yuanjun
Wang Peilun
Abstract：Under the field conditions,the effects of different N fertilizer treatment combined with differ-ent concentrations of paclobutrazol (MET)on the chlorophyll content,leaf photosynthetic parameters,leaf ar-ea index (LAI),canopy photosynthetic rate (CPR),canopy respiratory rate (CRR)and yield of potato by split plot test.The results showed that the chlorophyll content could be increased,the single leaf photosynthet-ic capacity could be enhanced,and the respiratory consumption could be reduced by increasing application of N fertilizer.But along with the LAI increasing,the CRR enhanced,which resulted in the decrease of CPR. Spraying MET could reduce the aboveground growth,increase the chlorophyll content,and decrease the LAI. The photosynthesis could be promoted by low concentration of MET but inhibited by high concentration.Under the condition of ensuring reasonable LAI,higher N fertilizer combined with reasonable MET control decreased CRR and increased CPR.From the results of two years experiment,the yield was highest with the treatments of lower N (225 kg·hm -2 )combined with 100 mg·L -1 MET and higher N (295 kg·hm -2 )with 300 mg·L -1 MET.
Keywords：PotatoN fertilizerPaclobutrazol (MET)Physiological characteristicsYield
Publication Date：2015-07-02
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 62-67,73 )