보온절충(保溫折衷) 못자리에 있어서 제초제(除草劑)에 의한 잡초방제(雜草防除)에 관한 연구(硏究)

Weed Control with Herbicides in Protected Semi - irrigated Rice Seedbed

보온절충(保溫折衷)못자리에서 유망시(有望視)되는 제초제(除草劑) 8종(種)에 대(對)하여 수축(收縮)의 약해(藥害) 및 제초효과(除草效果)를 검토(檢討)하였다. 1. Benzophenap(240g) 및 pyrazoxyfene(200g) 등(等)은 초기약해(初期藥害)가 인정(認定)되지 아니했으며, 제초효과(除草效果)도 만족(滿足)스러웠다. 2. Dimepiperate(210g) 단제(單劑), dimepiperate + probenazol(210+120g) 합제(合劑) 및 dimepiperate + molinate + probenazol(120+120+120g) 합제(合劑) 등(等)은 초기약해(初期藥害)가 없었으며 제초효과(除草效果)에 있어서 피에 대(對)하여는 우수하였으나, 그 이외(以外)의 공시초종(供試草種)은 저조(低調)한 살초효과(殺草效果)를 나타냈다. 3. Butachlor + pyrazolate(70+120g) 및 butachlor + chlormethoxynil(60+120g) 등(等)의 합제(合劑)는 초기약해(初期藥害)가 초기유묘(初期幼苗)와 근신장(根伸長)을 약간 저해(沮害)하는 현상(現象)을 보였으나 경시적(經時的)으로는 회복(回復)되었으며, 제초효과(除草效果)는 우수하였으나 butachlor + chlormethoxynil 합제(合劑)는 공시다년생잡초(供試多年生雜草)에 대(對)하여는 만족(滿足)스럽지 못하였다. 4. Chlormethoxynil(180g)은 초기약해(初期藥害)가 없었으며 공시(供試)한 일년생잡초(一年生雜草)에 대(對)하여 우수한 제초효과(除草效果)를 나타냈다. 5. 엽록소함량(葉綠素含量)이 있었으며 그 이외(以外)의 처리구(處理區)는 조사시기(調査時期)에 관계(關係)없이 유의성(有意性)이 없었다. 6. 근활력(根活力)은 butachlor + pyrazolate(70+120g) 및 butachlor + chlormethoxynil(60 + 120g)등(等)의 합제구(合劑區)에서 약종후(藥種後) 12일(日)에 유의성(有意性)이 있었으나 경시적(經時的)으로 회복(回復)되었으며 그 이외(以外)의 처리구(處理區)는 조사시간(調査時期)에 관계(關係)없이 유의성(有意性)이 없었다.

This experiment was conducted to find out selective herbicides which are safe to the rice seedlings and to provide effective weed control method in protected semi-irrigated rice seedbed. There was no crop injury in rice with benzophenap [2-(4-2, 4-dichloro-3-methylbenzoyl)-1, 3-dimethyl-pyrazol-5-yl-oxy)-4'-methyl acetophenone] (240g), pyrazoxyfene [1,3-dimethyl-4-(2,4-dichlorobenzoyl)-Sphenacyloxy pyrazole] (200g), chlormethoxynil [2,4-dichlorophenyl-4-nitro-3-methoxyphenyl ether] (180g), dimepiperate [S-(1-methyl-1-phenethyl)-piperidine-l-carbathioate] (210g), dimepiperate + probenazol [3-allyloxy-1,2-benzisothiazol-1,1-dioxide] (210 + 120g) mixture and dimepiperate + probenazol + molinate [S-ethyl-N,N-hexamethylene-thiol-carbamate] (120 + 120 + 120g) mixture at times of application studied. Butachlor [2-chloro-2',6'-diethyl-N-buthoxymethyl acetanilide] + pyrazolate [4-(2,4-dichlorbenzoyl)-1,3dimethyl-pyrazol-5-yl-p-toluene-sulfonate] (70 + 120g) mixture and butachlor + chlormethoxynil (60 + 120g) mixture caused root length to shorten and root viability to decrease. However, the crop injury was recovered at 25 days after seeding. Benzophenap, pyraxoxyfene and butachlor + pyrazolate mixture were effective for weed control when applied at 2 days before seeding. Chlormethoxynil and butachlor + chlormethoxynil mixture was very effective for controlling annual weed. Dimepiperate, dimepiperate + probenazol mixture and dimepiperate + probenazol + molinate mixture did not control most weeds except for Echinochloa crus-galli (L.) Beauv.