浙江农业学报
浙江農業學報
절강농업학보
ACTA AGRICULTURAE ZHEJIANGENSIS
2000年
6期
352-356
,共5页
早稻抛秧%杂草%优势种群%出苗高峰%化学除草
早稻拋秧%雜草%優勢種群%齣苗高峰%化學除草
조도포앙%잡초%우세충군%출묘고봉%화학제초
early transplanted rice by seedling-broadcasting%weed%dominant species%emergence peak%chemical control of weeds
温州农区早稻抛秧田杂草发生种类以稗草、矮慈菇、节节菜、异型莎草、牛毛毡为主，稗草为优势种群，杂草危害程度重于插秧田。抛秧后2 d杂草开始陆续出苗，抛后10 d呈现出苗高峰，比插秧田早5 d，稗草的出苗高峰出现于抛秧后5～10 d。经3年试验证明，禾大壮+苄嘧磺隆，二氯苄和丁苄对禾本科、莎草及阔叶草均有良好防效，对水稻安全，增产幅度大。不同施药期试验表明，二氯苄和丁苄分别于抛秧后3～5 d和5～9 d使用，对水稻株高和分蘖有明显抑制作用，故安全有效用药期应为抛秧后7～11d和11～13 d。
溫州農區早稻拋秧田雜草髮生種類以稗草、矮慈菇、節節菜、異型莎草、牛毛氈為主，稗草為優勢種群，雜草危害程度重于插秧田。拋秧後2 d雜草開始陸續齣苗，拋後10 d呈現齣苗高峰，比插秧田早5 d，稗草的齣苗高峰齣現于拋秧後5～10 d。經3年試驗證明，禾大壯+芐嘧磺隆，二氯芐和丁芐對禾本科、莎草及闊葉草均有良好防效，對水稻安全，增產幅度大。不同施藥期試驗錶明，二氯芐和丁芐分彆于拋秧後3～5 d和5～9 d使用，對水稻株高和分蘗有明顯抑製作用，故安全有效用藥期應為拋秧後7～11d和11～13 d。
온주농구조도포앙전잡초발생충류이패초、왜자고、절절채、이형사초、우모전위주，패초위우세충군，잡초위해정도중우삽앙전。포앙후2 d잡초개시륙속출묘，포후10 d정현출묘고봉，비삽앙전조5 d，패초적출묘고봉출현우포앙후5～10 d。경3년시험증명，화대장+변밀광륭，이록변화정변대화본과、사초급활협초균유량호방효，대수도안전，증산폭도대。불동시약기시험표명，이록변화정변분별우포앙후3～5 d화5～9 d사용，대수도주고화분얼유명현억제작용，고안전유효용약기응위포앙후7～11d화11～13 d。
Field weed investigation showed, Echinochloa crusgalli, Sagittaria pygmaea, Rotala indica Cyperus difformis,Eleocharis yokoscensis are main weed species in early transplanted rice by seedling-broadcasting in Wenzhou,Zhejiang. Among them, E. crusgalli is dominant. Weed damage to rice is heavier in seedling-broad-casting rields than in dibbling firlds Weeds begin to emerge at 2 d after seedling-broadcasting, reach to a peak at 10 d, which is 5 d earlier than in dibbling fields. Field trials in 1997 - 1999 showed the mixtures of molinate + bensulfuron-methyl ,quinclorac + bensulfuron-methyl ,and butachlor + bensulfuron-methyl are highly effective on weeds and safe to rice with increased rice yield. However, plant height and tilling number are strongly prevented if the mixture of quinclorac + bensulfuron-methyly is applied at 5 - 9 d after seedling broadcasting or butachlor + bensulfuron-methyl applied at 3 - 5 d,so they are recommended to be sprayed at 11 - 13 d or 7 - 11 d after seedling broadcasting, respectively.
