轮叶党参栽培地适宜化学除草剂筛选的研究

Study on screening proper chemical herbicides of Codonposis Lanceolata Bentn.et Hook.f. milpa

为解决轮叶党参栽培过程中的除草难题,进行了对轮叶党参适宜化学除草剂筛选的研究.试验结果表明:适宜苗前土壤处理剂为敌草胺和除芽通,两种除草剂混合处理可扩大杀草谱.轮叶党参实生苗地播后苗前适宜处理剂量为(1.0+0.7)kg a.i/hm^2. 1年生以上秧苗移栽田苗前适宜处理剂量为(1.5+1.0)kg a.i/hm^2,对1年生杂草的防除效果可达到90％.该混剂药效发挥的适宜土壤湿度范围是70％左右,土壤湿度过高易造成药害,过低降低药效.适宜茎叶处理剂为拿捕净及芳氧苯氧基丙酸类除草剂;1年生以上的轮叶党参对克芜踪有一定的耐性.

The study on screening proper chemical herbicides of Codonposis Lanceolata Bentn. et Hook, f. were done in order to solve the difficulty of weed control during its cultivation. The result indicated the suitable soil treatment herbicides were napromide and pendimethalin which were used before germination. The mixture of the two herbicides could broaden the weeding band. The suitable dosage of the mixture for seedling field is (1.0 + 0.7) kg a.i/hm2 but (1.5 + 1.0) kg a. i/hm2 for biennial or perennial transplanting field and the controlling effect could reach 90% on annual weeds. The suitable soil moisture range was 70% or so. High soil moisture could cause phytotoxicity while low soil moisture could reduce the mixture effect. The suitable stem and leaf treatment was sethoxydim and aryloxy-phenoxy propionic acid herbicides. Biennial and perennial Codonposis Lanceolata Bentn. et Hook. f. had certain tolerance to paraquat.