广灭灵防除移栽油菜田杂草研究

1998～2000年，广灭灵36CS对油菜田杂草效果及油菜安全性室内盆栽和田间小区试验研究表明：广灭灵是防除猪殃殃、牛繁缕、婆婆纳等油菜田主要阔叶杂草的有效药剂，对油菜较安全。虽易引起油菜白化，但可通过选用耐药力较强的秦油2号、蓉油4号等品种，培育壮秧，大苗移栽，适当延长施药到移栽间隔期等措施来解决；若在油菜移栽前，用广灭灵81～108g/hm^2与乙草胺337.5～450g/hm^2混用，不仅可降低广灭灵用量，而且能明显降低油菜白化率，并能扩大杀草谱，提高防效，促使油菜籽增产。

STUDY ON APPLICATION OF CLOMAZONE 36CS TO TRANSPLANTED RAPE FIELD

Experiments of weed control with herbicide Clomazone 36CS and itsmixtures were carried out in rape culture pots and rape field plots in Shanghai Wusi Farm and Shanghai Academy of Agricultural Sciences during 1998～2000．The results indicate that Clomazone 36CS is an effective herbicide able to fully kill main broaded-leaved weeds as Galium aparine，Malachium aquatica，Veronica persica，etc．，it is also highly effective in the control of Pao annua．Use of Clomazone 36CS is safe in rape culture，but rape seedlings are sensitive to Clomazone 36CS at higher doses to a certain degree and so form albino plants frequently，this disadvantage can be avoided by adopting rape varieties with rather high tolerance to herbicide such as Jinyou No．2，Rongyou No．4 etc．，raising vigorous stands more than 40 days old，transplanting advanced seedlings，prolonging appropriately the interval between herbicide application and seedling transplantation；in addition，application of the mixture of 81～108g a．i．／hm2 Clomazone 36CS plus 337．5～450g a．i． ／hm2 Acetochlor before transplanting rape seedlings will result in decrease of Clomazone 36CS dose and reduction of al bino plants and so broaden weed-killing spectrum，improve weed control effect and increase rape yield．