Cu、Zn制剂处理对贴梗海棠容器苗生长的影响

Effect of Cu and Zn Preparations on the Growth of Container Seedlings of Chaenomeles speciose

选择5种不同的化学制剂(CuCO 3、Cu(OH)2、CuSO 4、ZnCl 2、ZnCO 3)分别配制成4种不同质量浓度(40、100、160、220 g·L^-1),涂抹于黑色塑料容器内壁,对贴梗海棠容器苗进行化学控根试验,测定苗高、地径、生物量、根系形态以及Cu、Zn残留量等指标。结果表明:160 g·L^-1 Cu(OH)2制剂对贴梗海棠容器苗地上部生物量积累有促进作用;经100 g·L^-1 CuSO 4制剂处理的容器苗根尖数多,新生侧根多,根系表面积、体积显著高于对照;Cu制剂中离子残留质量分数较高,由高到低的排序表现为Cu(OH)2、CuCO 3、CuSO 4,Zn制剂中离子残留明显少于Cu制剂,但不同质量浓度ZnCl 2和ZnCO 3制剂处理对容器苗生长存在一定抑制作用。根据控根效果和苗木生长指标综合分析,质量浓度为100 g·L^-1的CuSO 4制剂对贴梗海棠容器苗处理效果最优。

Comparing root-controlling effects of different chemical agent on container seedlings of Chaenomeles speciosa,and finding whether the remnant of chemical agent will cause harm to seedlings,so as to solve the problem of root system malformation and improve the quality of container seedlings.Five chemical agents(CuCO 3,Cu(OH)2,CuSO 4,ZnCl 2,and ZnCO 3)under four concentrations(40,100,160,and 220 g·L^-1)were used in root-controlling experiments of container seedlings.Seedlings’height,diameter,biomass,characteristics of root system and remnant of Cu^2+ and Zn^2+were measured.Cu(OH)2 agent under the concentrations of 160 g·L^-1 could promote seedling’s aboveground biomass accumulation;root tip number,new seedling roots,root system’s superficial area and volume of CuSO 4 agent under 100 g·L^-1 are significantly higher than CK;However,treatments under different ZnCl 2 and ZnCO 3 root-controlling agents have a certain inhibitory effect on container seedlings’growth.According to the comprehensive analysis of root-controlling effect and seedling growth index,the CuSO 4 agent under 100 g·L^-1 is optimal for the container seedlings of C.speciosa.