摘要:
To study the influence of rare earth fertilizer on the growth and development of flue-cured tobacco roots,promote the further implementation of lean production of flue-cured tobacco,fertilizer test method of rare earth different concentration gradient,and the root activity,in the process of tobacco root growth and development of the total absorbing surface area and root dry quality and root volume and SOD,POD,CAT and PPO 4 oxidase activity were studied,respectively.The results showed that rare earth fertilizer on root activity,total root surface area,root dry quality and root volume had a greater role in promoting,and when the fertilizer use amount reached 30 ~ 45 kg/hm2,the root activity of flue-cured tobacco was the highest.When the fertilizer use amount was 15 kg/hm2,flue-cured tobacco root total absorbing surface area,root dry quality and root volume in the same period reached the maximum.The effect of rare earth fertilizer on SOD enzyme activity was CK > T1 > T3 > T2,the effect on POD enzyme activity was CK > T3 > T2 > T1,the effect on CAT enzyme activity was CK > T1 > T2 > T3,and the effect on PPO enzyme activity was CK > T1 > T2 and T3.Rare earth fertilizer had great influence on the root activity,total absorption surface area,root dry quality and root volume of tobacco root,the 4 indexes had great influence on different oxidases.The application of rare earth fertilizer promoted the development of root system,and inhibited the activity of oxidase.The root system maintained high absorption ability at the same growth stage,and maintained high life power.%为研究稀土肥料的施用对烤烟根系生长发育的影响,促进烤烟精益生产的进一步实现,设置不同浓度梯度的稀土肥料施用试验,并对生长发育过程中烤烟根系的根系活力、总吸收表面积、根干物质量与根体积以及SOD,POD,CAT和PPO等4种氧化酶的活性进行了研究.结果表明,稀土肥料对根系活力、总吸收表面积、根干物质量与根体积有较大促进作用,且当稀土肥料的使用量达到30 ~ 45 kg/hm2时,烤烟的根系活力最高;当稀土肥料的使用量为15 kg/hm2时,烤烟根系的总吸收表面积、根干物质量与根体积在相同时期最大.稀土肥料对SOD酶活性的影响大小表现为CK>T1 >T3 >T2,对POD酶活性的影响大小表现为CK >T3 >T2 >T1,对CAT酶活性的影响大小表现为CK>T1> T2> T3,而对PPO的酶活性的影响大小表现为CK>T1 >T2,T3.稀土肥料除对烟根系的根系活力、总吸收表面积、根干物质量以及根体积之间有较大影响外,4项根系指标对不同的氧化酶也有较大程度的影响.施用稀土肥料对根系的发育有较大的促进作用,且能抑制氧化酶的活性,使得根系在相同生育期能够保持较大的吸收能力,保持较高的生命动力.