Effects of Temporary Planting Density on Growth and Physiological Properties of Jinxuan Tea Seedlings

Qiao Mingming; Xiang Qinzeng; Zhang Lixia; Han Xiaoyang; Tian Yueyue; Fan Yangen

doi:10.14083/j.issn.1001-4942.2017.05.009

Abstract：Temporary planting of tea seedlings is an important technical measure for enhancing the survival rate of cloning seedlings introduced from the southern area of China.In order to explore the suitable density of tea temporary planting in the environment conditions of Shandong Province,one-year-old cutting seedlings of Camellia sinensis cv.Jinxuan were used as materials,and four planting densities of D1 (1 plant per cluster),D2 (25 plants per cluster),D3 (50 plants per cluster) and CK (100 plants per cluster) were designed for the experiment.The root morphological parameters,root activity,length of young shoots,chlorophyll fluorescence parameters and survival rate before transplanting were studied.The results indicated that:(1) the root zone temperature increased with the increasing of planting density,and it was significantly different among the treatments during dormancy period,while that of D1 was significantly lower compared to CK during germination period.(2) The length,surface area,volume and numbers of new roots were all showed D3 ＞ D2 ＞ CK ＞ D1,but there was no significant difference between D3 and D2.In addition,the new roots of D3 generated earlier and the root activity was significantly higher than the other treatments during dormancy period.D2 had the highest root activity during germination period,and had no significant difference with D1 and D3.(3) D2 had the highest survival rate and the longest length of young shoots.The chlorophyll fluorescence parameters (Fv/Fo,Fv/Fm and qP) of tea seedlings showed D3 ＞ CK ＞ D2 ＞ D1 during dormancy period but D2 ＞ D3 ＞ D1 ＞ CK during germination period.After comprehensive analysis and comparison,D2 treatment seedlings could achieve more suitable root zone temperature,better growth of root,the highest root activity in germination period,rapid growth of new shoots,but suffered less stress of light,moisture and nutrition.All these indicated that D2 was the more suitable temporary planting density for introduced tea seedlings.