本文報導甲氧基護谷、丁拉甲護谷之作用特性及推廣經驗。甲氧基護谷商品名為一克草，為水田雜草萌前、萌後初期殺草劑，藥劑之吸收，由發芽時之幼芽部之一部份在進行，但其主要作用部位為幼芽部（幼芽＞莖葉＞根），本劑為典型之光要求型藥劑，在明條件下其活性甚強。丁拉甲護谷係甲氧基護谷及丁基拉草之混合制，前者係接融型藥劑，後者係吸收移行型藥劑，商品名為克草丹的丁拉甲護谷兼具上述兩大特性，無論對一年生之尖葉及闊葉雜草或多年生部份雜草均有特效。

Chloromethoxynil , commercially known as X-52 is pre-, and early post-emergence herbicide in rice field. Absorption of chemical occurs in young shoot and part of root tissues. Its absorption ability is in descending order of young shoot, stem and leaf, and root. Under light, acti vi ty is very prominent. "Kotsaotan II eX-52 + Machete) is a mixture of chloromethoxynil and butachlor to combine contact and absorption modes of action I respectively. It is very effective to grasses and braod-Ieaf annual weeds and also most perennial weeds.