关键词: 豇豆, 摘叶摘荚, 产量, PRI, F_v /F_m, 叶绿素

Abstract: With removing leaves and pods at flourishing podding stage， we studied the flower abscission rate，podding rate and yield of cowpea，meanwhile，we measured the photosynthetic parameters，chlorophyll fluorescence parameters and concentration of chlorophyll，processing stepwise regression analysis. The results showed：at flourishing podding stage，the flower abscission rate of 1/2 leaf removing was the highest，and the other treatments were higher than that of the CK. More removing leaves，lower podding rate，otherwise，higher podding rate；yields from high to low were control > 1/3 leaf removing > 1/4 leaf removing > 1/2 leaf removing. At flourishing podding stage，removed leaves and pods at the same time，podding rates from high to low were 1/4 leaf removing and 1/4 pod removing >1/4 leaf removing and 1/3 pod removing > 1/3 leaf removing and 1/4 pod removing > control > 1/3 leaf removing and 1/3 pod removing. The yields from high to low were 1/4 leaf removing and 1/4 podremoving > control > 1/3 leaf removing and 1/4 pod removing >1/4 leaf removing and 1/3 pod removing > 1/3 leaf removing and 1/3 pod removing. Stepwise regression showed：F_v/F_m could monitor abscission rate with equation y₁ =97. 77 - 58. 21x₁ . F_v/F_m and PRI could monitor podding rate with equation y₂ =4. 06+68. 03x₁ +197. 74x₂ .Chlorophyll，abscission rate and podding rate could monitor yield with equation y₃ =4 268. 13+253. 52x₃ -48.10x₄ -5. 50x₅ .

Key words: cowpea, removal of leaves and pods, yield, PRI, F_v/F_m, chlorophyll