论文部分内容阅读
作者在云南省12个县（市），进行溴甲烷熏蒸烟草苗床防除杂草试验，结果表明：在烟草出苗前和出苗期，各处理对单、双子叶杂草防效分别为100％，94.7％～97.4％。在烟苗小十字期和五真时期，40～80g／m~2剂量对单、双子叶杂草防效分别为93.0％～96.8％、91.3％～94.3％；20g／m~2剂量对单、双子叶杂草防效较低，分别为86.8％～87.8％、81.5％～89.1％。各处理对烟草种子及烟苗安全，能间接促进烟草生长，处理区烟苗茎叶粗大，根系发达，烟苗单株茎叶鲜、干重分别比对照增1.27～1.375g、0.1～0.105g，侧根数比对照增10.4～14.7条，根鲜、干重分别比对照增0.038～0.071g、0.0083～0.01g，第五真叶长×宽比对照增1.l～2.3×1.8～1.9cm。认为40～60g/m~2剂量处理有效合理。
The authors tested the fumigation of methyl bromide fumigation tobacco seedbed in 12 counties of Yunnan Province. The results showed that the control efficacy of weeds on single and dicotyledonous weeds was respectively 100% and 94.7% ~ 97.4%. The control effect of 40 ~ 80g / m ~ 2 on single and dicotyledonous weeds was 93.0% ~ 96.8% and 91.3% ~ 94.3% respectively in the small cross and five real days of tobacco seedling; , Dicotyledonous weeds control effect is low, respectively 86.8% ~ 87.8%, 81.5% ~ 89.1%. The treatment of tobacco seed and tobacco seedlings safety, can indirectly promote the growth of tobacco, treatment area tobacco stems and leaves thick, root system developed, stems and leaves of tobacco plant fresh and dry weight than the control by 1.27 ~ 1.375g, 0.1 ~ 0.105g , The number of lateral roots increased by 10.4 ~ 14.7 compared with the control. The root fresh weight and the dry weight increased by 0.038 ~ 0.071g and 0.0083 ~ 0.01g respectively compared with the control. The fifth true leaf length and width ratio increased by 1.l ~ 2.3 × 1.8 ~ 1.9cm . That 40 ~ 60g / m ~ 2 dose effective and reasonable treatment.