Cu、Zn制剂对油橄榄容器苗生长和根系的影响

目的]针对油橄榄容器苗存在主根较为粗大、须根极少、根系盘绕等现象开展化学制剂控根试验,找出适宜油橄榄容器苗的化学控根试剂,从而解决根系畸形导致的油橄榄苗木质量差等问题。方法]采用4种不同浓度的CuSO_4制剂及ZnSO_4制剂对油橄榄2年生容器苗进行控根试验,测定苗高、地径及地上部、下部生物量,通过根系扫描仪分析根系生长特点,探讨各项生长指标以及生理指标对控根效果的影响。结果]显示:(1)20 g·L~(-1)和60 g·L~(-1)的Cu制剂可提高容器苗的地上部分生长量;60 g·L~(-1)和200 g·L~(-1)的Cu制剂可显著增加生物量的积累。(2)200 g·L~(-1)的Cu制剂对苗木新根着生效果最为显著;120 g·L~(-1)的Cu制剂对根系的直径、表面积和体积有良好的促进作用;而不同ZnSO_4控根制剂处理对苗木侧根的各指标产生抑制作用。(3)枝条生长量与侧根长度呈显著正相关性;地径、枝条生长量与侧根表面积呈极显著正相关关系。(4)120 g·L~(-1)的Cu制剂处理后叶片的可溶性蛋白质含量最高,Cu制剂浓度为20 g·L~(-1)时,叶片的叶绿素含量增加。结论]试验发现质量浓度为120 g·L~(-1)和200g·L~(-1)CuSO_4制剂控根效果良好,可运用于实际生产。

Effect of Cupreous and Zincous Preparations Treatment on the Growth and the Root Control for Container Seedlings of Olive

Objective] To conduct chemical agent root-controlling experiments aiming at controlling bulky taproots, rare fibrous roots and root system twining of olive container seedlings, and to find the chemical root-controlling agents suitable for the olive container seedlings, so as to solve problems such as poor quality of olive seedlings caused by root system malformation. Method] CuSO₄ agents and ZnSO₄ agents under 4 different concentrations were used in root-controlling experiments of 2-year-old olive container seedlings. The seedling height, ground diameter, aboveground biomass and underground biomass were measured. The growth characteristics of the root system were analyzed by a root system scanner, so that the effects of different growth indexes and physiological indexes on root-controlling effects were discussed. Result] 1. The growth increment of aboveground parts of the container seedlings could be boosted by Cu agents under the concentrations of 20 g·L^-1 and 60 g·L^-1; the biomass accumulation could increase obviously by Cu agents under the concentrations of 60 g·L^-1 and 200 g·L^-1. 2. The Cu agent under 200g·L^-1 had the most significant impact on the growth of new seedling roots; the Cu agent under 120g·L^-1 promoted the increase of diameter, superficial area and volume of the root system effectively; various indexes of seedling lateral roots were inhibited by treatments under different ZnSO₄ root-controlling agents. 3. Significant positive correlation existed between branch growth increment and lateral root length; Extremely significant positive correlation existed between the ground diameter increment, branch growth and the superficial area of lateral root. 4. Soluble protein content in leaves reached the maximum after treatment under the Cu agent of 120g·L^-1; the chlorophyll content in leaves increased under treatment of Cu agent of 20g·L^-1. Conclusion] It was verified in the experiments that the CuSO₄ agents under mass concentrations of 120 g·L^-1 and 200 g·L^-1 have good root control effects and can be applied in practice.