江苏丘陵地区旱直播水稻田杂草化除技术

Chemical Technology of the Weed Control in Dry Direct-Seeded Rice Fields in Jiangsu Hilly Area

通过田间小区试验测定了47%氯吡·丙·异隆可湿性粉剂土壤封闭,同时结合不同除草剂茎叶处理的2次化除控草技术方案对旱直播稻田杂草防效及水稻的安全性,为江苏丘陵地区旱直播水稻田杂草化除提供适宜的除草剂种类和施药方案。结果表明,江苏丘陵地区旱直播水稻播后苗前利用47%氯吡·丙·异隆可湿性粉剂2.25 kg/hm^(2)及以上用量土壤封闭处理,对杂草的株防效和鲜重防效可达95%以上。在此基础上水稻4~5叶期选用4%双唑草腈悬浮剂5250 mL/hm^(2)拌土撒施、19%氟酮磺草胺悬浮剂180 mL/hm^(2)+20%氰氟草酯水乳剂1500 mL/hm^(2)+20%苄嘧磺隆可湿性粉剂225 g/hm^(2)、50%二氯喹啉酸可湿性粉剂900 g/hm^(2)+20%氰氟草酯水乳剂1500 ml/hm^(2)+2.5%五氟磺草胺悬浮剂1500 mL/hm^(2)、9.5%丙嗪嘧磺隆悬浮剂825 mL/hm^(2)+20%氰氟草酯悬浮剂1500 mL/hm^(2)、2.5%五氟磺草胺悬浮剂1800 mL/hm^(2)+20%氰氟草酯悬浮剂1500 mL/hm^(2)茎叶喷雾处理对稗属杂草、千金子、马唐、香附子、异型莎草、碎米莎草、酸模叶蓼、鳢肠、鸭舌草等杂草的株防效和鲜重防效均高于99%,对水稻安全。

In order to provide suitable herbicide types and application schemes for the weed control in dry direct-seeded rice fields in the hilly areas of Jiangsu,we used the plot test to verify control efficacy and selectivity of pre-emergence herbicide,halosulfuron-methyl·pretilachlor·isoproturon 47%WP combined with post-emergence herbicides which were used twice.The results showed that control effects based on plant and fresh weight were all more than 93%,when halosulfuron-methyl·pretilachlor·isoproturon 47%WP with over 2.25 kg/hm^(2) was sprayed at the pre-emergence stage.On the basis of the above,pyrenpyril 4%SC with 5250 mL/hm^(2) mixed soil for spreading,or fluoxsulam 19%SC with 180 mL/hm^(2) mixed with cyhalofop-butyl 20%EW with 1500 mL/hm^(2) and bensulfuron-methyl 20%WP with 225 g/hm^(2),or quinclorac 50%WP with 900 g/hm^(2) mixed with cyhalofop-butyl 20%EW with 1500 mL/hm^(2) and penoxsulam 2.5%SC with 1500 mL/hm^(2),or promazine suimesulfuron 9.5%SC with 825 mL/hm^(2) mixed with cyhalofop-butyl 20%EW with 1500 mL/hm^(2),or penoxsulam 2.5%SC with 1800 mL/hm^(2) mixed with cyhalofop-butyl 20%EW with 1500 mL/hm^(2) were sprayed at the 4~5 leaves stage in dry direct-deeded rice fields in hilly areas of Jiangsu.The control effect based on plant and fresh weight of all the above herbicides treatments were over 99%,on Echinochloa spp.,Leptochloa chinensis,Digitaria sanguinalis,Cyperus rotundus,Cyperus difformis,Cyperus iria,Polygonum lapathifolium,Eclipta prostrata,Monochoria vaginalisl,and all the above herbicides were selectivity to rice.