赛类斯在土壤和玉米中的残留动态及其对杂草防效的研究

Study on Cyanazine Residues in Corn and Soil and Its Effect on Weed Control.

１９９７ 年—１９９８ 年在山东省桓台县的试验表明， 超过常用量５０ ％ （２ ．７ ｋｇ／ｈ ｍ ２ ） 的赛类斯在土壤中的半衰期为２ ～４ ｄ ，在作物中为１ ～２ ｄ 。在收获期的土壤、玉米秆和籽粒中，残留量均小于０ ．０１ ｍ ｇ ／ｋ ｇ 或未检出。对杂草防效的调查表明，赛类斯能有效地去 除玉 米田 杂草 ， 对 杂草 数 量和 鲜 重的 防除 率 分别 为 ８８ ．２ ％ ～９５ ．０ ％ 和 ９７ ．２ ％ ～９８ ．２ ％ ，并使玉米秸秆生物量增加８ ．４ ％ ～９ ．２ ％ ，产量增加１２ ．４ ％ ～１３ ．５ ％ 。

Studies were conducted to detect the disappearing trend of Cyanazine in corn as well as soil and its effect on weed control in Huantai County,Shandong Province in 1997 and 1998. The results showed that the half life period of Cyanazine(2.7kg/hm2) was 2～4 days in soil and 1～2 day(s) in straw. The residue quantity of Cyanazine was less than 0.01mg/kg both in the corn straw as well as grain and in the soil. The analyses indicated that Cyanazine could effectively control the weed in the corn fields. Compared with uncontrolling weed fields, the rate of removal weeds of Cyanazine was 88.2%～95.0% in weed numbers and 97.2%～98.2% in weed fresh weight. The biomass of the corn straw was increased by 8.4%～9.2% and the yield was increased by 12.4%～13.5%.