Effect Of Pruning Period On Photosynthetic Characteristics And Nutrient Metabolism Of Walnut(Juglans Regia L.)

In order to provide the scientific basis for the reasonable pruning periods of walnut,the 6a’Qingxiang’,’Lipin 2’ and ’Zhonglin 1’ walnut were selected and treated with pruning method in different time.The pruning periods were subdivided into pruning before defoliation,pruning after defoliation,winter pruning,pruning before germination and pruning after germination.The results were showed as follw:To the Pn:There were no significant difference among.pruning before defoliation,pruning after defoliation,pruning before germination and pruning after germination.The pruning after defoliation performed the best for ’Qingxiang’ and ’Zhonglin 1’,and.the effect of pruning before defoliation and pruning after defoliation was optimum for ’Lipin 2’.The winter pruning performed bad for ’Qingxiang’and ’Lipin 2’,and it was significantly lower than pruning after defoliation mostly;The winter pruning and CK performed the worst,and they were significantly lower than pruning before defoliation and pruning after defoliation mostly.To the Chlorophy Ⅱ:The content of Chlorophy Ⅱ was not remarkable difference among the treatments(including CK)for ’Qingxiang’;and the winter pruning performed the worst.The pruning before defoliation,pruning after defoliation and pruning before germination performed the best for ’Lipin 2’,and they were no significant difference mostly;The winter pruning performed the worst,and was significantly lower than pruning before defoliation,pruning after defoliation and pruning before germination mostly.There were no significant difference among pruning before defoliation,pruning after defoliation,pruning before germination and pruning after germination for ’Zhonglin 1’ and the pruning before defoliation and pruning after defoliation performed better;The winter pruning and CK performed the worst,and they were significantly lower than pruning before defoliation and pruning after defoliation.To the soluble sugar:The pruning before defoliation,pruning after defoliation and pruning before germination performed better for ’Qingxiang’,and there were no significant difference among them;the CK was the worst for ’Qingxiang’.There were no significant difference among treatments except the pruning after germination and CK for ’Lipin 2’;The pruning before defoliation and pruning after defoliation performed the best,and CK was the worst.There were no significant difference among pruning before defoliation,pruning after defoliation,pruning before germination and pruning after germination,and they performed the best;the CK was second best,and the winter pruning was the worst.To the starch:The pruning after defoliation was the highest level for ’Qingxiang’ and ’Zhonglin 1’mostly.And it was significantly higher than the pruning before defoliation,winter pruning,pruning before germination and CK for ’Qingxiang1;And it was significantly higher than the winter pruning and CK for ’Zhonglin 1’.The pruning before defoliation and pruning after defoliation performed the best for’Lipin 2’,and they were significantly higher than the winter pruning and pruning after germination.The CK was the worst for the three varieties.To the soluble protein:The pruning after defoliation was significantly higher than the winter pruning,pruning after germination and CK mostly for ’Qingxiang’;and it was significantly higher than the winter pruning and CK for ’Lipin 2’ and ’Zhonglin 1’ mostly.For the three varieties,the pruning after defoliation was the highest level,and the winter pruning performed the worst in most periods.To the N:The pruning after defoliation was the highest level for ’Qingxiang’ and ’Zhonglin 1’ in most periods,and there were no significant difference among treatments(including CK).The pruning after defoliation was the highest or the second-highest level for ’Lipin 2’ in most periods.The CK was the worst one,and the winter pruning was poorer one.The CK and winter pruning had not significant difference mostly.To the P:The pruning after defoliation was the highest or the second-highest level for ’Qingxiang’mostly,and the winter pruning or CK performed the worst,but there were no significant difference among treatments(including CK).There were no significant difference among treatments except the winter pruning and CK for ’Lipin 2’,and the pruning after germination was the best one;The CK was the worst one;The winter pruning was poorer one.There were no significant difference among treatments except the winter pruning and CK for ’Zhonglin 1’;The winter pruning and CK had not significant difference mostly,and they were significantly lower than the pruning after defoliation.To the K:The pruning after defoliation was the highest level for the three varieties mostly.There were no significant difference among treatments(including CK)mostly.The CK was worst;The winter pruning was poorer one.The winter pruning and CK had not significant difference mostly.To the Ca:There were no significant difference among treatments(including CK)mostly for’Qingxiang’ and ’Lipin 2’.The pruning after defoliation was the highest or second-highest level mostly.The pruning after defoliation performed the best for ’Zhonglin 1’.The CK was the worst;The winter pruning was poorer one.The winter pruning and CK was significantly lower than the pruning after defoliation for ’Zhonglin 1’ mostly.To the Mg:The pruning after defoliation performed the best,and it was significantly higher than the winter pruning and CK for ’Lipin 2’;The pruning after defoliation was the highest or second-highest,and it was significantly higher than the winter pruning or CK for ’Qingxiang’ and ’Zhonglin 1’.The CK was the worst,and the winter pruning was poorer one.To the Fe and Mn:The pruning after defoliation performed the best,and it was significantly higher than the winter pruning and CK mostly;There were no significant difference among treatment for three varieties.The CK was the worst one,and the winter pruning was poorer one.To the Zn:The pruning after defoliation was the highest one for ’Lipin 2’ and ’Zhonglin 1’ in most periods,and there were no significant difference among treatments.The pruning after defoliation performed the best one,and it was significantly higher than the winter pruning or CK.The CK was the lowest for the three varieties mostly.To the Cu:The pruning after defoliation was the highest one for ’Qingxiang’,and it was significantly higher than the winter pruning and CK mostly;The pruning after defoliation was the highest one for’Lipin 2’,and there were no significant difference among treatments(including CK)mostly.The pruning after defoliation was the highest mostly for ’Zhonglin 1’,and there were no significant difference among treatments.The CK was the lowest level mostly for the three varieties,and the winter pruning was poorer one.There were no significant difference between the winter pruning and CK.